OpenDRC-DA8 User Manual
Contents
1. Bypass Disables the FIR filter The filter is disabled when the button is lit Send to DSP Writes the currently loaded filter into the DSP memory File Mode Manual Mode In File Mode the window displays the Browse and Unload FIR buttons as shown above In Manual Mode the display changes to allow direct text entry of the FIR filter coefficients as shown below The coefficients can be pasted into the window from a text editor Clear Taps miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 30 Ni 4 5 1 FIR filtering overview FIR finite impulse response filtering differs from the IIR infinite impulse response filters used in the PEQ and crossover blocks Technically speaking IIR filters are recursive meaning that each output value is partially calculated from earlier output values as well as from input values An FIR filter is specified by a large array of numbers whereas an IIR filter requires only a fairly small of values to be specified These numbers are conventionally referred to as taps The OpenDRC DA8 can compute 9400 taps when run at 48 kHz and 3400 taps when run at 96 kHz These taps can be distributed as you wish across the eight output channels with the limitation that each output channel must have 6 or more taps and can have no more than 2048 taps The decision on how many taps to allocate to each channel up to you and should be determined after w2. Number of PEQ bands per block 10 10 O Compressor block ves vs Maximum per channel time delay 1 two channels single stereo digital signal miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 8 nnn 2 THEMINIDSP WORKFLOW We strongly recommend taking a methodical approach to your new miniDSP audio processor Remember that the audio processor is a powerful tool and incorrect settings can potentially cause damage to your system Please follow the steps below carefully 1 Download and install the plugin When your order ships your ordered plugin or plugins will be available from the User Downloads section of the miniDSP website Download and install your plugin as described in Software installation on page 11 2 Familiarize yourself with the plugin Before connecting your computer to the processor it s worth starting the plugin and familiarizing yourself with its user interface Click on and explore each of the tabs Input Routing and Output For more information see Configuring the processor starting on page 16 At this time the plugin is still in offline mode so any changes you make will not be downloaded into the miniDSP hardware Since we will reset all of the processing parameters in the next step you can feel free to experiment at this point 3 Reset all parameters From the Restore menu select the Factory Default option This will reset all
3. W Private networks such as my home or work network E Public networks such as those in airports and coffee shops not recommended because these networks often have litte or no security What are the risks of allowing a program through a firewall a Allow access 3 1 2 Mac OS X On versions of OS X from 10 7 Lion and later you will need to inform the GateKeeper program that it is OK to install and run this software Go to System Preferences then click on Security amp Privacy and select the General tab 1 Click on the padlock icon in the lower left corner and enter your password in order that you can make changes to the settings 2 Under the text Allow Applications downloaded from click on Anywhere Allow applications downloaded from Mac App Store _ Mac App Store and identified developers e Anywhere Then download and install the following programs You will need to accept the license agreements in order to successfully complete the installation e Latest version of Adobe Flash e Latest version of Adobe Air If you haven t updated these recently you should download and install the latest versions prior to running the miniDSP install program To install the miniDSP software open the Mac folder of the download and double click on the miniSHARC 4x8 dmg of miniSHARC 4x8_96k dmg file to open it in a new window Then double click on the installer program Install miniSHARC 4x8 app or Inst
4. Time ms 40 Release Time ms 100 Infinity 90 1 72 63 54 45 36 27 Note that the compressor algorithm is bypassed by default so click on the Bypass button to see the curve as shown here In this example the threshold is set to 20 dB so the compressor will activate when the signal on that channel reaches 20 dB relative to full output The ratio is set to 2 so if the input signal level to the compressor then increases by 10 dB the output level will increase by only 5 dB If the input signal level to the compressor is at full scale 0 dB then the output level will be limited to 10 dB Two additional parameters control the action of the compressor the attack time and the release time These two parameters govern how quickly the compressor activates when the signal level exceeds the threshold and how quickly it deactivates when the signal level reduces The optimum settings may need to be tuned by ear For more information see the Wikipedia article Dynamic range compression miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 26 SN 4 4 CUSTOM BIQUAD PROGRAMMING Custom biquad programming is available in the PEQ and Crossover blocks Its purpose is to allow you to directly provide the low level parameters aka biquad coefficients that control the digital filters of the processor thus providing an almost infinite degree of flexibility For example
5. in the user interface the following dialog box will appear A miniSHARC 4x8 kit with Serial 965535 was detected Please choose from one of the following The options are Synchronize Config Download the currently selected configuration into the corresponding configuration preset of the processor After downloading the configuration data the plugin is in online mode and any changes to processing parameters will be downloaded immediately in real time That is the user interface is now live Synchronize and Upgrade This is similar to Synchronize Config but also upgrades the internal data of the processor This option may appear after downloading and installing an updated version of the plugin Restore Config Restore the data in the currently selected configuration to the factory defaults When using this option any connected equipment should be muted or powered off until you have set the configuration to a working state Note that the configuration data will be lost so if needed ensure that you have saved the configuration to a file prior to using this option Cancel This option cancels the attempt to connect to the processor The plugin will remain in offline mode miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 15 ANNANN DSP 4 CONFIGURING THE PROCESSOR The OpenDRC DA8 processor is configured with the miniSHARC 4x8 or miniSHARC 4x8 96k plugin user i
6. pass filters Crossover filters can also be used to limit low frequency content delivered to a speaker or subwoofer to help protect it from over excursion Unlike conventional analog crossovers the flexibility of DSP allows a completely arbitrary mix of different filter slopes and types Filters can be set at any frequency or disabled completely This allows maximum flexibility in matching your crossover to the acoustic characteristics of the loudspeaker drivers Crossover filters are displayed in two groups of four channels 1 through 4 and channels 5 though 8 Each group is configured by default as a four way crossover The current channel is displayed in orange with the other three in the group in grey BOvEHNG the mouse over the curve DriNgs up an overlay SSS Seno showing the frequency and the attenuation at that frequency Gain 6 dB Gain 6 dB OUT CH2 OUT CH1 miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 21 Basic Advanced By default the crossover is in basic mode and shows the controls described below Advanced mode enables custom biquad programming for almost infinite flexibility in crossover filter implementation This is described in Custom biquad programming on page 27 Cutoff Frequency Sets the nominal cutoff frequency of the crossover In actual fact the crossover has a more or less gradual transition from full on to full off as determ
7. ANANN DSP OPENDRC DA8 2 IN 8 OUT HIGH RESOLUTION AUDIO PROCESSOR WITH FIR LINEAR PHASE CAPABILITY User Manual miniDSP Ltd Hong Kong www minids com Features and specifications subject to change without prior notice 1 Revision history Revision Description Date 21 August 2015 8 September 2015 miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice nin CONTENTS important informa ON isiin naaa ERER E ened sans ARRENAR EAA ERENER EE EET ELEN 5 System REQUIEN S siisii ARARA R 5 Boe r a A A 5 VaN MCE eaa AA AAO OA AOA T AOE OEA OAA OAE E E E 6 TEREE EA E 91 1 ene nen E E E E A E E E E E E A E E A E A AT ee A 6 AN E EE E a E E 6 ANOLE ONEA T aa E E 6 L POUC COV VIEW eE E EAEE EN 7 1 1 TP E OE nen eee en nee ee ee ee eer 7 1 2 BFS FUE P CO SO ct cree ete ee st tts ws ew ces et Stale nc ow oe sect Gece 8 1 3 OOS VS el DUE ss nacesaincresinnisareaisa cna E cede nedosanaaneeeseeaceaaieanorns 8 2 The MINIDSP WOrkFflOW ccceccssccsecceecesecseccseceucceceseceuecseceseeeuceseeeuceeeeeneeeeceeeeueteeceeeeeueteeceeeeeueeseseeeeneeeeeeees 9 SNS CAMA OL WNC SOU icsiesetetccatecacedetacatatecaetadiescaetetacatatadatasadedadeammasisuennsstenslent once ones eaonsaamenaiatsiseeseaukonreceenoentees 11 3 1 Software installation ec ceccceccsscceecceccescceecceeeeuceeeceeeceueeseceeeceeceeeeeuceeeeeeeeecteeeeeeeeecteeeeeeteeeeeeeeeeeeeetes 11 3 1 1 WY WAGOW S
8. DSP concept is one hardware unit one software plugin audio processing solution This concept leverages the inherent flexibility of DSP digital signal processing to deliver a range of flexible but cost effective solutions Hardware Software Audio processing unit plugin solution Hardware unit In this case the hardware unit is the miniDSP OpenDRC DA8 Software plugin The software plugin is installed on your PC or Mac and determines the processing that the DSP will perform It provides a friendly user interface and downloads instructions into the miniDSP hardware unit that tell it how to process the audio signal Currently the OpenDRC DA8 supports two plugins as described below Other platforms miniDSP makes many other boxed and kit hardware units with analog stereo digital and multichannel digital HDMI connections Some units feature inbuilt Class D amplification See the full range of miniDSP products 1 3 CHOOSING A PLUGIN Two plugins are currently available for the OpenDRC DA8 the miniSHARC 4x8 and the miniSHARC 4x8 96k The table below summarizes the key differences between these plugins when used with the OpenDRC DA8 some parameters are the same but are included to show that they do not change with the plugin miniSHARC 4x8 plugin miniSHARC 4x8 96k plugin Number of digital input channels Number of analog output channels ee Digital input sample rate Internal sample rate Total number of FIR taps
9. It will have a name like ENC_miniSHARC_ver2 17 hex Click on the Program Verify button The status bar will indicate progress Do not disconnect or power off the processor during the firmware upgrade After the status indicates that the verify has completed successfully click on the Reset Device button and then quit the upgrade utility Return to the miniSHARC 4x8 plugin If there is a dialog informing Connection to DSP closed click on OK Click on the Connect button and then on About this product from the Help menu to verify the new MiniDSP Ltd firmware version MEROHARC ah Version v1 8 Firmware 2 17 miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 40 nin 6 4 OBTAINING SUPPORT 1 Check the forums on miniDSP com to see if this issue has already been raised and a solution provided 2 Contact miniDSP via the support portal at minidsp desk com with a The specific product you are having an issue with in this case O penDRC DA8 b Aclear explanation of the symptoms you are seeing c A description of troubleshooting steps see Troubleshooting above performed and your results miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 41
10. REMOTE CONTROL Many standard and programmable remote control units can Volume Up be used with the OpenDRC DA8 By default the OpenDRC DA8 recognizes the Apple Remote with the key Config Dec Config Inc assignments shown at right N The commands Config Inc and Config Dec change the selected configuration preset up or down For example if the currently selected preset is 1 pressing Config Inc changes it to 2 Volume Down Master Mute In addition the OpenDRC DA8 can learn the control codes of your current remote if it supports one of the following remote control codes e NEC e Sony e Philips RC6 To initiate the learning process drop down the IR Remote menu and select IR learning Click on the Learn button for an operation and then press the desired button on the remote control If the code is accepted the status will change to show a tick This screenshot shows the IR learning screen Master Mute Volume Up Volume Down SPDIF TOSLINK AES EBU Config 1 Config 2 Config 3 Config 4 To unlearn a command press the Learn button and wait for the plugin to time out A ii miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 37 nin 6 ADDITIONAL INFORMATION 6 1 SPECIFICATIONS Computer connectivity Driverless USB 2 0 control interface for Windows and Mac OS X Digital audio Input S PDIF on RCA connector Isolated with digital a
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12. ail in FIR filtering and design starting on page 30 4 3 7 Invert and mute Each channel can be inverted in polarity and individually muted When either of these options is selected the visual indicator on the button is lit 4 3 8 Time delay A delay of up to 1500 or 3000 ms depending on the plugin can be applied to each output channel To set the delay click in the delay entry box for a channel The delay value can be entered numerically and the up and down arrows can be used to change the delay in small 0 02 ms increments The time delay corresponds to a distance This distance is shown in centimeters below the entry box delay in ms Click and 0 3000ms Click on arrows to type to enter _ ii increase and lower 3 Dist cm 103 Equivalent distance calculated miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 25 SNNN DSP 4 3 9 Compressor The compressor reduces the gain of an output channel when the audio signal reaches a certain level as specified by the Threshold parameter The gain of the channel will be progressively reduced as the signal increases above the threshold according to the Ratio parameter This can be used to limit the power delivered to speakers and thus reduce the risk of damage from overdriving This screenshot shows an example Compressor setting Compressor OUTPUT CHANNEL 1 Threshold dBFs 20 2 Attack
13. all miniSHARC 4x8 96k app Once installation is complete the plugin will automatically start miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 12 nnn 3 2 HARDWARE CONNECTIVITY All connections to the OpenDRC DA8 are made on the rear panel 3 2 1 Digital input Connect a single digital source to the S PDIF coax RCA connector Digital Inputs Analog Outputs a z JSA 20 Out Outs Oued Dut A n INI Outi ut 3 Outs Out From digital source Note the digital input accepts only a stereo PCM digital signal It does not accept encoded or multichannel digital audio such as Dolby Digital or DTS 3 2 2 Analog outputs There are eight analog output channels Unbalanced connections are made directly from the RCA jacks to power amplifiers Be sure to take careful note of the channel numbering shown in this diagram and on the rear panel Digital Inputs Analog Outputs e oe eo eo PC Co t l rl COnNro SB 2 0 Out 2 Out 4 Out Out 8 USB 2 0 00e iNi Out 1 Out 3 Out 5 Out 7 To power amplification miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 13 INN DSP 3 2 3 DC power The supplied 5 VDC power supply includes a set of interchangeable power pins Fit the correct pins for your country Connect the DC plug to the 5 VDC power socket Digital Inputs Analog Outputs
14. already answered in this user manual and in the online application notes on the miniDSP com website So please take the time to carefully read this user manual and the online technical support Thanks for your understanding WARRANTY TERMS miniDSP Ltd warrants this product to be free from defects in materials and workmanship for a period of one year from the invoice date Our warranty does not cover failure of the product due to incorrect connection or installation improper or undocumented use unauthorized servicing modification or alteration of the unit in any way or any usage outside of that recommended in this manual If in doubt contact miniDSP prior to use FCC CLASS B STATEMENT This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions e This device may not cause harmful interference e This device must accept any interference received including interference that may cause undesired operation Warning This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment doe
15. ate Download the latest version from http get adobe com air miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 38 Cannot connect to the board by USB No audio or low audio on outputs No signal showing on input meters Audio sounds distorted Audio is coming through the wrong outputs Cannot reloada configuration Reset the processor by power cycling the unit Make sure the processor is seen in the device manager as a HID device Check the cabling from the processor to your amplifiers Check that your amplifiers are turned on and that any volume controls are turned up Check that the input meters and output meters are showing adequate signal if not see item 5 Check that master mute is not enabled Check that the mute buttons in the output channel strips are not enabled Check that the FIR filters have valid coefficients and are bypassed if they do not Check that your crossover frequencies are correct e g that you don t have high pass and low pass frequencies incorrectly set Check that the matrix mixer is sending the correct inputs to the correct outputs Check the cabling from your source Check that your source is playing audio and that it is not muted or have volume control turned down Check that the plugin is synchronized with the hardware unit Check the output meter and ensure that you are not overloading the outputs If ne
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17. cessary reduce the output gain and or the amount of boost in the EQ blocks Check the cabling from the processor to your amplifiers Check that you have correctly set up the matrix mixer to send the correct inputs to the correct outputs Confirm the file format of your file xml Confirm the version of the file miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 39 INN DSP 6 3 MCU FIRMWARE UPDATE miniDSP may occasionally provide an update to the processor s MCU firmware to enable new features Currently firmware upgrade is supported from the Windows platform only IS IN PROGRESS DOING SO MAY BRICK YOUR PROCESSOR A DO NOT DISCONNECT THE USB CABLE OR POWER FROM THE PROCESSOR WHILE FIRMWARE UPDATE To update the MCU firmware 1 A a o Download and install the latest miniSHARC 4x8 plugin from the User Downloads section of the miniDSP website Connect the processor to your computer via USB Start the miniSHARC 4x8 plugin if it is not already running Click on the Connect amp Synchronize button and select the Synchronize option from the dialog From the menus select Restore gt Upgrade Firmware The processor will be put into boot loader mode and the miniDSP upgrade utility will start The status line should display Device attached Open Hex File Click on the Open Hex File button and select the hex file included in the download
18. click on the Connect amp Synchronize button and select the Synchronize option If all goes well you are now in online mode and any changes that you now make in the plugin user interface will be immediately sent to the processor Before proceeding click on each Configuration preset button Config 1 2 etc to ensure that all presets have been synchronized and or set to defaults For more information see Synchronizing with the processor on page 15 8 Initial audio check Power on your connected equipment first on the input side e g source or preamp then on the output side e g power amps Turn the volume on your OpenDRC DA8 down low view the Master Volume display in the plugin while turning the knob counter clockwise and start playing music or a pink noise test signal Gradually increase the volume until your hear audio quietly coming from the speakers Verify that the plugin is performing the intended function For example if implementing a two way crossover confirm that the tweeter is playing high frequencies and that the woofer is playing low frequencies 9 Fine tune your configuration With your initial setup running you can now proceed to fine tune and optimize your system You will need to perform acoustic measurements and use the configuration screens to adjust processing parameters Configurations can be saved to different files in order to archive different versions or to enable Be sure to save your configuratio
19. e 5 1 Stats AICA O S riiin inei E RNR TETEE I ESTRE RIERREN EEREN 5 2 Front panel controls essssssessneersessesresrrrrrreeresrrsersrrresrrsersersesevresrrsrrsteserrstesterevrestesteserseseeseesesreseeseesee 5 3 Infrared remote CONTLIO cccccceeccsecesccseccscceseeecceeceneceucceeceneceeceeceeeceseeeuceeeeseeeueteceeeeuetseseseeeueesesanes 6 ACI TO Pie MIO Fi atO riiin AAA 6 1 SOS CIC ARNON aaa AAAA saaueaceueecaccnscenecsaa annus atawatsuetenceusseuns asciurseensaseesesisueatensnenteenceeases 6 2 OCH CS OC UY S cacnsessosaussemasnnnsaestmonssnoains N E EEE EEE EN E EE EEEE 6 3 MCOT NEPA E a E E ene Cee eee ee 6 4 ODININ SUDDOT g aryais SISAN SAS ESEE REEERE EENE EREE EEEE REE EEE EREEREER E EREET miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice nnn IMPORTANT INFORMATION Please read the following information before use In case of any questions please contact miniDSP via the support portal at minidsp desk com SYSTEM REQUIREMENTS To configure the miniDSP audio processor you will require a Windows PC or Apple Mac OS X computer with the following minimum specification Windows e PC with 1GHz or higher processor clock speed Intel Pentium Celeron family or AMD K6 AMD Athlon AMD Duron family or compatible processor recommended 512 megabytes MB of RAM or higher Keyboard and mouse or compatible pointing device USB 2 0 port Microsofts Windows Vi
20. e changes will thus be audible as the changes are made The plugin is in offline mode Changes made to audio processing parameters in the plugin user interface will be made locally only The next time the plugin is synchronized to the processor the parameters will be downloaded to the processor as long as the Synchronize Config button is selected The configuration contained in the miniDSP hardware unit cannot be uploaded back to the computer Therefore you must save your configuration to a file if you wish to recover from any changes you make while in offline mode 4 6 2 Selecting a configuration The active configuration is selected by one of the four buttons in the Configuration Selection area By default configuration 1 is selected Configuration Selection TE Config 2 Config 3 Config 4 To switch to a different configuration click on a different button There are two cases The plugin is in online mode Audio processing will switch to the parameters contained in the selected configuration If however parameters of the newly selected configuration have been changed since the last that particular configuration was synchronized to the processor then a dialog will appear asking you if you want to synchronize the configuration The plugin is in offline mode The user interface will update to show the parameters of the newly selected configuration If this configuration is changed in the user interface it will be downloaded
21. eo eo eo PC Control C Out2 Ours Outs Out 8 wien Svc oe oao STS Out Out3 Out5 D Pe AN M i Apply power to the processor only after all input and output connections have been made The processor can usually be left powered on If powered on and off the following sequence is recommended e On Power on line level equipment including the OpenDRC DA8 then turn on power amplification Off Turn power amplification off then power off line level equipment including the OpenDRC DA8 3 2 4 USB To configure the processor connect its USB port to a USB 2 0 port on your computer using the supplied cable Note that USB is used only for configuration audio data cannot be streamed to the processor over USB Digital Inputs Analog Outputs amp 0 0 x AA AN IN1 Out 1 5VDC USB Type B connector USB Type A connector miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 14 a e pa o myniose 3 3 SYNCHRONIZING WITH THE PROCESSOR Communication with the processor takes place over a USB connection Note that USB is used for control purposes only Audio data cannot be streamed to the processor over USB Ensure that the computer is connected to the processor by a USB 2 0 port Then click on the Connect amp Synchronize button The first time you connect or if you have made any changes to any data
22. et up in the Input and Output tabs When the miniSHARC 4x8 and miniSHARC 48 96k plugins are used with the OpenDRC DA amp 8 only the SPDIF inputs are active We recommend that the 12S inputs be unrouted as shown here I2S Out 12S In Output1 Output2 Output3 Output4 Output5 Output6 Output7 Output8 Inputi Input2 SPDIF In Output Output2 Output3 Output4 Output5S Output6 Output7 Outputs Input3 Input4 To make the routing matrix easier to view the labels of the input and output channels can be changed in the Input and Output tabs resulting in I2S Out WoofL MidL TweetL SubR WoofR MidR TweetR SPDIF In WoofL MidL TweetL SubR WoofR MidR TweetR InL InR The above example is a typical routing matrix for 4 way loudspeaker If more than one input signal is routed to an output channel those channels are mixed together summed Here is another common routing matrix for a stereo 3 way crossover and a pair of summed subwoofer outputs I2S Out WoofL MidL TweetL WoofR MidR TweetR Subi SPDIF In WoofL MidL TweetL WoofR MidR TweetR Subi InL INR miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 18 ANANN DSP 4 3 OUTPUT TAB The Output tab displays a row of output channel control strips All channels are identical 1 Output1 delay in ms 0 3000ms 0 Dist cm 0 2 Output2 12 Om 39 24 36 48 60 72 0 delay in
23. g applications It features e Stereo digital S PDIF input via RCA connector and eight analog output channels RCA e Choice of 48 kHz and 96 kHz plugins e Parametric EQ on all input and output channels Butterworth and Linkwitz Riley crossovers up to 48 dB octave and advanced biquad programming for an unlimited range of filters and crossover types e FIR filtering on every output channel with taps per channel assignable up to a total of 9600 taps 48 kHz plugin or 3400 taps 96 kHz plugin e Matrix mixer for flexible channel assignment and configuration e Real time configuration of all processing parameters e Volume control by front panel or infrared remote e Four on board presets selectable from front panel or by infrared remote 1 1 TYPICAL USAGE In its most typical application the OpenDRC DA8 connects to a single digital source and directly drives power amplifiers in an active loudspeaker system The onboard FIR filtering supports linear phase crossovers Loudspeakers of up to 4 way or three way plus subs are directly supported Digital Source Digital audio OpenDRC DA8 Analog audio Speaker enclosures Subwoofer s Power amplification 1 With the 96 kHz plugin the processor operates at 24 bit resolution and 96 kHz internal sample rate miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 7 ANNIN 1 2 THE MINIDSP CONCEPT The mini
24. ined by the filter slope Filter type Selects the type and slope of the filter The steeper the slope the more quickly frequencies above or below the cutoff frequency are attenuated There are three types of filter Butterworth BW Available in 6 12 18 24 30 36 42 and 48 dB octave Butterworth crossover filters are 3 dB down at the cutoff frequency Linkwitz Riley LR Available in 12 24 36 and 48 dB octave Linkwitz Riley crossover filters are 6 dB down at the cutoff frequency Bessel Available in 12 dB octave only a Bessel filter gives a more gradual roll off through the crossover region Bypass Clicking on the Bypass button disables or enables that high pass an or low pass filter The filter is bypassed when the button is lit Enabled Bypassed Each channel can be linked to one other channel When a channel is linked to another the crossover settings of that channel are mirrored to the other Typically the corresponding drivers on the left and right channels are linked left and right tweeter left and right woofer and so on To link a channel select the other channel from the drop down menu at the top left of the Xover screen and click the Link checkbox Select Channel Output Channel 2 Output Channel 3 Output Channel 4 Output Channel 5 miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 22 SIIWN DSP 4 3 5 Parametric EQ Parametric equalizatio
25. irst six filters will be set and the last four will not be changed Be careful if the last line ends with a comma that counts as an extra biquad If the file contains more than ten biquads then an error will be reported and no filters will be changed miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 28 Crossover advanced mode The Crossover blocks have eight biquads on each output channel In Advanced mode all eight biquads need to be specified After pasting in the coefficients click on the Process button for them to take effect Basic O Advanced biquadl bO 0 000042324575459811486 b1 0 00008464875091962297 b2 0 000042324575459811486 a1 1 975933280159255 aZ 0 9761025776610925 Bypass 4 4 3 Biquad design software Following are programs that can be used to design your biquad coefficients 4 4 3 1 Biquad calculation spreadsheet The community developed biquad calculation spreadsheet allows many filter types to be calculated including notch filters Linkwitz transforms and filters with arbitrary Q factor Access this spreadsheet here requires Microsoft Excel http www minidsp com images fbfiles files All digital coefs v1 20101026 zi 4 4 3 2 Room EQ Wizard REW Room EQ Wizard is a free acoustic measurement and analysis tool available for Windows Mac and Linux platforms It includes the ability to automatically generate a bank of parame
26. ms 0 3000ms 0 Dist crn 0 3 Output3 delay in ms 0 3000ms 0 Dist cm 0 Outputs 12S Outputs 4 5 Output4 Output5 Mute Invert delay in ms 0 3000ms delay in ms 0 3000ms 0 0 Dist cm 0 Dist crm 0 6 Output 12 0 12 24 36 48 60 72 0 delay in ms 0 3000ms 0 Dist cm 0 7 8 Output7 Output amp delay in ms 0 3000ms delay in ms 0 3000ms 0 0 Dist cm 0 Dist cm 0 miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 19 Ni 4 3 1 Channel strip layout Each output channel has a complete strip of controls Channel label Outputi Gain adjustment evel meter Current gain Edit crossover settings Set FIR filter x a Edit EQ settings 4 Enable mute and invert a Edit compressor settings delay in ms Time delay in ms 0 3000ms 0 Dist crm 0 4 3 2 Channel label Each output channel has a customizable label which is shown at the top of the channel strip This label also appears on the Routing tab To change the label click on it type a new label up to eight characters and press the Return key 4 3 3 Gain control and level monitoring Level meter Displays the current signal level in real time The plugin must be in online mode to display signal levels Gain adjustment The gain of each channel can be adjusted by moving the Gain Adju
27. n PEQ is a flexible type of equalization filter It can be used to correct for errors in loudspeaker output to compensate for acoustic room effects and to tailor the overall system response for best sound Click on the PEQ button to open the parametric equalizer settings window PARAMETRIC EQUALIZER OUTPUT CHANNEL EQ BAND SELECTION Advanced EQi Freq 100 PARAMETRIC EQ BAND EQ2 Freq 500 EQ3 Freq 5000 Filter type EQ4 Freq 1000 EQS5 Freq 1000 Frequency 100 Gain 5 K Bypass EQ6 Freq 1000 _ i l EQ7 Freq 1000 EQ8 Freq 1000 EQ9 Freq 1000 Freq 1000 There are ten parametric EQ filters on each input and output channel The window displays a frequency response graph showing the combined response of all enabled parametric filters on that channel For example the screenshot above shows a response curve created with a low shelf boost filter at 100 Hz a dip at 500 Hz and a high shelf cut filter at 5000 Hz Hovering the mouse over the curve brings up an overlay showing the frequency and the gain at that frequency T a ae ee ERNIE Frequency 3632 I Gain 2 dB P Each channel can be linked to one other channel When a channel is linked to another the PEQ settings of that channel are mirrored to the other Typically the corresponding drivers on the left and right channels are linked left and right tweeter left and right woofer and so on To link a channel select the other channel from the drop down menu at the top left of
28. n on a regular basis while working on fine tuning it A auditioning of alternative configurations 10 Continue to operate offline With your miniDSP processor configured you can continue to operate in offline mode that is without the computer connected To do so simply disconnect the USB cable The processor remembers the configuration last set and will continue to operate without the computer Note while in offline mode the configuration can still be modified in the plugin interface These changes will not be downloaded to the processor until it is synchronized again See Working with configurations on page 33 miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 10 nin 3 INSTALLATION AND SETUP 3 1 SOFTWARE INSTALLATION When your order ships your ordered plugin or plugins will be available from the User Downloads section of the miniDSP website You will need to be logged into the website with the account you created when purchasing The User Downloads link is visible from the dropdown menu at the top right of the website page Your Name Here User Downloads User Orders Account Maintenance CG Logout Navigate to the OpenDRC Plug ins section of User Downloads then download the zip file or files under the heading miniSHARC 4x8 48k and or miniSHARC 4x8 96k Double click on it to unzip it Then follow the installation procedure below according to yo
29. nt configuration preset and load the file P N 4 6 4 Restoring to defaults Configurations can be reset to the factory defaults from the Restore menu There are two options Factory Default Reset all four configuration presets to the factory default settings Current Configuration Only Reset only the currently selected configuration preset to the factory default settings If the plugin is in online mode the configuration data on the processor all or just one configuration as selected will also be reset to factory defaults Otherwise the reset will take place in the user interface only and the new configuration data will be downloaded to the processor next time it is synchronized miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 34 nin 4 7 KEYBOARD SHORTCUTS The miniSHARC 4x8 plugin supports the use of the keyboard for many operations Tab The Tab key moves the focus from the current user interface element to the next A blue grey surrounding box usually indicates the user interface element with the focus Shift Tab moves the focus in the opposite direction Up down arrows The up down arrow keys and in some cases the left right arrow keys adjust the value of many parameters if they have the focus e Output channel gain e Crossover frequency and filter type e PEQ filter frequency gain and Q Space The Space bar toggles buttons that have two states such a
30. nterface program Once fully configured the computer is no longer required as source and preset selection can be done with the front panel or a remote control see Using the OpenDRC DAS If desired however the plugin can remain connected during use for real time live control of all audio processing This screenshot shows the miniSHARC 4x8 plugin with the key areas highlighted Master volume Connect amp Synchronize Mute Main menu Preset selection ihe testo re Help IR Remote r Configuration Selection Config 1 peg Fa AUDIO ON Tab selection O Main configuration window 125 Inputs SPDIF Inputs 1 2 Inputs A During initial configuration of the processor it is strongly recommended that any connected amplification be muted or powered off The Mute button disables all audio output AUDIO ON The Master volume display shows the current volume setting Master Volume fa miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 16 ANNANN DSP 4 1 INPUT TAB The Input tab displays a row of input channel control strips When the miniSHARC 4x8 plugin is used with the OpenDRC DA8 only the two rightmost channels labeled SPDIF Input receive signal Channel label Level meter Gain adjustment PEQ settings Mute INPUTS Volume and RMS mete 2S Inputs Each input channel has a customizable Channel label label which is shown at
31. of the design program Press the Process button Confirm that the frequency response graph is as you expect Press Send to DSP This will write the coefficients into the DSP s memory ue wen To clear the filter coefficients click Clear Taps and then Send to DSP Bypass button is turned off If you clear the filter taps make sure that you also bypass the gt g A filter otherwise there will be no audio through that channel If after selecting a filter file or setting coefficients the frequency x a AAA response graph does not change as expected make sure that the miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 32 ANNIN 4 6 WORKING WITH CONFIGURATIONS The data that controls the audio processing is called a configuration The processor stores four configuration presets in its internal memory which can then be selected from the front panel or via remote control 4 6 1 Online and offline mode Initially the plugin is in offline mode When the Connect amp Synchronize button is used the plugin downloads configuration data into the processor and goes into online mode Changes made in the plugin user interface therefore fall into two categories The plugin is in online mode The plugin user interface is live that is any changes made to the audio processing parameters in the user interface are immediately downloaded to the processor The effect of thes
32. orking with an FIR filter design program see below The number of taps is set in the lower right corner click on the text entry box and type the desired number of taps then press Tab or Return 4 5 2 FIR filter design software The filter coefficients must be created with the aid of filter design software miniDSP does not provide any such software instead referring you to the many software packages available for this purpose both freeware and commercial Please see the FIR filter tools page on our website 4 5 3 Filter file format The filter coefficient file loaded in File Mode uses IEEE 754 single precision binary floating point format The number of entries in the file must not exceed the allocated number of taps In Manual Mode the coefficients must be plain text in this format be 1 b1 1 b2 0 5 b3 0 5 b4 0 2 b5 1 miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 31 Ni 4 5 4 Loading filter coefficients In File Mode 1 Click Browse navigate to the file containing the filter coefficients and open it A dialog will appear confirming the number of coefficients loaded Confirm that the response curve is as you expect Press Send to DSP This will write the coefficients into the DSP s memory 4 Toclear the filter coefficients click Unload FIR and then Send to DSP In Manual Mode 1 Cutand paste the coefficients from the text output
33. processing parameters back to the defaults and ensure that you have a clean slate for the next step 4 Perform initial configuration Use the plugin to set up an initial audio processing configuration as intended for your application For example typical things that can be done at this point are to e Set the labels of input and output channels e Mute unused input and output channels e Set crossover frequencies and slopes e Setup any essential equalization 5 Save configuration At this point save your initial configuration to a file A configuration is the set of all audio processing parameters You should save your configuration to a file on a regular basis to ensure that you do not lose your work if you inadvertently restore the processor to default settings For more information on configurations see Working with configurations on page 33 6 Make audio connections With the initial configuration done and now that you are familiar with the various controls it s time to connect the miniDSP OpenDRC DA8 into your system Ensure that all power is turned off when making audio connections See Hardware connectivity on page 13 miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 9 nnn 7 Go into online mode Apply power to the processor See DC power on page 14 for more information Leave other equipment turned off at this stage Connect the USB cable to your computer
34. s advanced mode allows each individual filter to be specified by its biquad coefficients After pasting in the coefficients click on the Process button for them to take effect Basic Advanced PARAMETRIC EQ BAND 1 biquadl bO 1 0028502800452856 b1i 1 9861466161796406 b2 0 9835367155382047 al 1 986206568337346 7 aZ 0 9863270434257823 Bypass Parametric EQ file import REW integration Multiple biquads in the parametric EQ block can be set at once by importing a coefficient file This file can be generated by Room EQ Wizard REW or by other programs The design program must be set for a 48 kHz sample rate if using the miniSHARC 4x8 plugin and a 96 kHz sample rate if using the miniSHARC 4x8 96k plugin The number of filters is limited to a maximum of ten This example illustrates the correct file format biguadl b0 0 998191200483864 bl 1 995052150046 354 b2 0 996920046 61L05 al 1 9950521500467384 a2 0 9951112472449212 biguad2 b0 0 999640139948623 bl 1 99816 0485581222 b2 0 9985489719847982 al 99616 0485581222 aZ 0 9981891119334211 biguads biguad4 biguads b0O 1 0010192374642126 bl 1 995U0555192569264 b2 0 9940580 1121381501 al 1 9950609036 14333 aZ 01 995071 36292249559 Note that the last line must not have a comma at the end If the file has less than ten biquads then only that number of biquads will be imported For example if importing a file with six biquads the f
35. s Bypass Invert and Mute if they have the focus miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 35 nin 5 USING THE OPENDRC DA8 amp Once configuration is complete the computer is not required and can be disconnected The front panel and or an infrared remote can be used to control e Master volume e Master mute remote control only e Preset selection FILTER SET 1 O 4 5 1 STATUS INDICATORS The current status of the processor is indicated by a set of LEDs that indicates the currently selected configuration preset 1 through 4 5 2 FRONT PANEL CONTROLS The processor uses a minimalistic physical control design with a single control knob To change the volume Rotate the control knob clockwise to increase the volume and counter clockwise to decrease it If the computer is connected and the plugin is in online mode the Master Volume display in the plugin updates accordingly This is not necessary for normal operation but can help with troubleshooting if needed To change the selected filter set Briefly press the control knob The Filter Set LED blinks quickly Rotate the control knob until the desired filter set LED is blinking Press the control knob again and the selected LED will remain steady miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 36 SN 5 3 INFRARED
36. s cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures e Reorient or relocate the receiving antenna e Increase the separation between the equipment and receiver e Connect the equipment into an outlet on a circuit different from that to which the receiver is connected e Consult the dealer or an experienced radio TV technician for help Notice Shielded interface cable must be used in order to comply with emission limits Notice Changes or modification not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment CE MARK STATEMENT The OpenDRC DA8 has passed the test performed according to European Standard EN 55022 Class B A NOTE ON THIS MANUAL This User Manual is designed for reading in both print and on the computer If printing the manual please print double sided The embedded page size is 8 2 x 11 Printing on A4 paper will result in a slightly reduced size miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 6 ANNIN 1 PRODUCT OVERVIEW Thank you for choosing the miniDSP OpenDRC DA8 audio processor The miniDSP OpenDRC DA8 is a powerful and flexible high resolution digital audio processor for active crossover and other audio processin
37. sta SP1 XP pro SP2 Win7 Win8 1 Microsofte NET framework v3 5 or later Adobe AIR environment latest version e Adobe Flash player latest version Mac OS X Intel based Mac with 1 GHz or higher processor clock speed 512 megabytes MB of RAM or higher Keyboard and mouse or compatible pointing device USB 2 0 port Mac OS X 10 4 or higher Adobe AIR environment latest version e Adobe Flash player latest version DISCLAIMER WARNING miniDSP cannot be held responsible for any damage that may result from the improper use of this product or incorrect configuration of its settings As with any other product we recommend that you carefully read this manual and other technical notes to ensure that you fully understand how to operate this product The miniDSP audio processor is a powerful tool and misuse or misconfiguration such as incorrectly set gains or excessive boost can produce signals that may damage your audio system As a general guideline you should perform the initial configuration of the miniDSP audio processor before enabling audio through any connected output device or amplification Doing so will help ensure that the software is correctly configured miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 5 nin Finally note that the miniDSP audio processor is a very flexible device and many of the questions we receive at the tech support department are
38. stment slider or by typing the desired gain into the Current Gain text box The maximum gain setting is 12 dB and the minimum gain setting is 72 dB O dB the default is unity gain or no change in level The level meters are useful in many situations For example when adding filters with boost monitor the level meters with typical signals and maximum levels to ensure that there is no clipping The meters can also be used during normal operation to monitor for or to help locate level or gain structure problems miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 20 SIN DSP 4 3 4 Crossover Each output channel has independent high pass and low pass filters Click on the Xover button to open the crossover settings window Bandpass OUTPUT CHANNEL 1 Fi out coi E 1000 2000 5000 10000 20000 Basic Advanced HIGH PASS FILTER SETTINGS LOW PASS FILTER SETTINGS Cut off frequency 100 Ea Cut off frequency 100 a Filter Type LR48dB oct Filter Type LR 48dB oct Bypass filter BYPASS Bypass filter BYPASS Crossovers split the frequency band to send to different drivers In a two way loudspeaker for example a low pass filter is used to remove high frequencies from the signal sent to the woofer and a high pass filter is used to remove low frequencies from the signal sent to the tweeter In a three way speaker the midrange driver will use both the high pass and low
39. the PEQ screen and click the Link checkbox Select Channel naa A gt CE Output Channel 3 Output Channel 4 Output Channel 5 miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 23 nnn EQ band selection Click on the radio buttons EQ1 EQ2 etc to display the parameters for that filter Basic Advanced By default each filter is in basic mode and shows the controls described below Advanced mode enables custom biquad programming for almost infinite flexibility in filter implementation This is described in Custom biquad programming on page 27 Filter type Selects the type of filter PEAK Create a dip or a peak in the frequency response LOW_SHELF Reduce or increase part of the frequency spectrum below a given frequency HIGH_SHELF Reduce or increase part of the frequency spectrum above a given frequency SUB_EQ Create a dip or a peak in the frequency response at low frequencies 10 to 50 Hz This filter type is similar to PEAK but gives more accurate results for low frequencies Note that activating any SUB_EQ filter reduces the number of available filters on that channel from ten to nine Frequency For the PEAK and SUB_EQ filter types this is the center frequency of the peak or dip For the HIGH SHELF and LOW_ SHELF filter types this is the frequency at which the gain is half of the set value Gain For the PEAK and SUB_EQ filter types this is the gain in dB at
40. the center frequency For the HIGH SHELF and LOW_ SHELF filter types this is the gain in dB reached at high or low frequencies respectively A filter has no effect if its gain is set to O dB Gain can be adjusted in increments of 0 1 dB up to 16 dB Q controls the sharpness of the filter For the PEAK and SUB_ EQ filter types lower Q gives a broader peak or dip while higher Q gives a narrower peak or dip For the HIGH SHELF and LOW_ SHELF filter types Q controls how quickly the filter transitions from no gain to maximum gain Bypass The Bypass button enables or disables a filter The filter is bypassed if the button is lit Note that all other filters are still operational unless individually bypassed A filter will also Enabled Bypassed have no effect if its gain is set to 0 0 miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 24 ANANN DSP 4 3 6 FIR Each output channel has a variable tap FIR filter Click on the FIR button to open the FIR filter settings window FIR FILTER CHANNEL File Mode Manual Mode Shared Windows rePhase 20crossover woofer irnpulse 2048 bin 1402 FIR filtering is a powerful feature that allows very complex filters to be constructed with the aid of suitable design software These filters can correct for amplitude only linear phase filters phase only or a combination or both FIR filtering is described in det
41. the top of the channel strip This label also appears on Gain adjustment pee Level meter the Routing tab To change the label click on it type a new label up to eight characters and press the Return key Displays the current signal level in real time The plugin must be in online mode to display signal levels Current gain Edit EQ settings a Mute channel a The gain of each channel can be adjusted by moving the Gain Adjustment slider or by typing the desired gain into the Current Gain text box The maximum gain setting is 12 dB and the minimum gain setting is 72 dB O dB the default is unity gain or no change in level Click on this button to open the parametric EQ settings window for that channel There are ten parametric EQ filters on each input channel For more details see Parametric EQ on page 23 Press this button to mute that input channel A visual indicator shows that the channel is muted a e miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 17 INN DSP 4 2 ROUTING TAB The Routing tab displays the matrix mixer which sets up the routing from input channels to output channels The input channels are labeled along the left and the output channels along the top Each input output channel assignment is turned on and off by clicking the button corresponding to the two channels The labels displayed for the input and output channels are s
42. to the processor the next time it is synchronized miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 33 Ni 4 6 3 Saving and loading configurations Configurations can be saved to and loaded from files Each configuration is stored in a separate file It is very strongly recommended that each configuration programmed into the processor be saved to a file to ensure that the configuration is not lost if the processor is inadvertently reset To save the currently selected configuration to a file drop down the File menu then select Save and then Save current configuration In the file box select a location and name of the file and save it File Restore Help IR Remote EEe Ean Selection Config 1 Save current configuration To load a configuration first select the configuration preset that you wish to load into Then drop down the File menu select Load and then Load configuration to current slot File Restore Help IR Remote Load gt Load configuration to current slot Save gt If the plugin is in online mode the new configuration data will be downloaded to the processor immediately If the plugin is in offline mode the configuration will be loaded into the user interface only and will be downloaded to the processor the next time it is synchronized S To copy a configuration from one preset to another save the configuration to a file then select a differe
43. tric EQ biquads based on a measurement These coefficients can be saved to a file from REW and loaded directly into a PEQ bank in a miniDSP plugin Room EQ Wizard can be downloaded here http www roomeaqwizard com downloads For guidance on using this feature please refer to the app note Auto EQ with REW 4 4 3 3 Active Crossover Designer ACD Active Crossover Designer ACD by Charlie Laub performs the complete set of functions for active crossover design and generates biquad coefficients as its output Download it here requires Microsoft Excel http audio claub net software ACD ACD html miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 29 ANANN DSP 4 5 FIR FILTERING AND DESIGN FIR filtering is a powerful and advanced feature of the OpenDRC DA8 It allows construction of complex arbitrary equaliztion and crossover filters with independent control of amplitude and phase The parameters of each FIR filter are set in the FIR settings window FIR FILTER CHANNEL 1 Bypass 5000 10000 yivivvim Send to DSP File Mode Unload FIR Taps Used 2048 file Users johnr Shared Windows rePhase 20crossover woofer impulse 2048 bin Taps Available 1402 Browse Opens a filter browser to select a file containing FIR filter coefficients See FIR filter file format below Unload FIR Deletes the currently loaded filter from the display and from the DSP memory
44. udio transformer A high quality onboard Asynchronous Sample Rate Converter ensures compatibility with most sample rates from 20 216kHz Analog audio outputs 8 x outputs on unbalanced RCA connectors 2 0V RMS full scale output Audio resolution 24 bit input and output 48 kHz internal sample rate with the miniSHARC 4x8 plugin 96 kHz internal sample rate with the miniSHARC 4x8 96k plugin Audio processing 32 bit floating point processor Storage presets All settings controllable in real time from software user interface Up to 4 presets stored in local flash memory Infrared remote Learning remote capabilities NEC Philips Sony Controls master volume mute digital input selection preset selection Power supply 5 VDC single supply 600mA 2 1 mm center positive Dimensions HxWxD 41 5 x 214 5 x 206mm 6 2 TROUBLESHOOTING The following table lists the most common causes of issues If following this table does not provide a solution see Obtaining Support below ca Symptoms Troubleshooting recommendation Cannot install software Confirm that you downloaded and installed the required frameworks first see Software Installation Software running in The Adobe Air environment may need a network connection background but not the first time you run a plugin Close the plugin program showing ensure that your computer has a network connection and restart the plugin b The Adobe Air environment may require a version upd
45. ur computer type Note the Adobe Air framework may need a network connection the first time the plugin is used If the plugin does not start properly see Troubleshooting 3 1 1 Windows Prior to installing the miniDSP software download and install the following programs You will need to accept the license agreements in order to successfully complete the installation e Microsoft NET framework version 3 5 or later e Latest version of Adobe Flash e Latest version of Adobe Air If you haven t updated these recently you should download and install the latest versions prior to running the miniDSP install program To install the miniDSP software open the Windows folder of the download and double click on the miniSHARC_4x8 exe or miniSHARC_4x8_96k exe program We recommend accepting the default installation settings Once installation is complete the plugin will automatically start Since the plugin checks for a network connection when starting up a warning such as the following may appear In this case click on Allow access miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 11 ANANN DSP e Windows Firewall has blocked some features of this Windows Firewall has blocked some features of nanoAVR on all public and private networks Name BINNA Publisher Unknown Path C program files x86 minidsp nanoavr nanoavr exe Allow nanoAVR to communicate on these networks
46. you can create hybrid crossovers with staggered cutoff frequencies create parametric EQ filters beyond those provided in the easy to use basic interface implement a Linkwitz transform or mix crossover and EQ biquads in the same block 4 4 1 What s a biquad A biquad is the basic unit of processing that is used to create digital filters It can be described either with an equation or with a signal flow diagram as shown here bo b 2 byg N wc 9 1 aiz t az H z bO x n gt au y n b2 a2 A single biquad like this can perform a great many functions including all of the functions of a single parametric EQ filter one 6 or 12 dB octave high pass or low pass filter and more Biquads are combined in series cascaded to create more complex filters The function that each biquad performs is determined by just five numbers a1 a2 a0 b1 and b2 These numbers are called the coefficients 4 4 2 Using custom biquad programming Each crossover block and PEQ filter has a selector that switches it to advanced mode Basic D Advanced In advanced mode the biquad coefficients can be pasted directly into the user interface These coefficients must be calculated using a design program see Biquad design software below for suggestions miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 2 Parametric EQ advanced mode In the parametric EQ block
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