INSTRUCTION MANUAL Active Speaker Module
Contents
1. 0 002 0 002 0 002 0 002 0 002 0003 0003 0 003 0 003 0 003 0 004 0 004 0 004 0 004 0 004 0 005 0 005 0 005 Truncate Figure 13 Click truncate Anything currently outside the display is drawn in grey and not processed You will notice that in the frequency graph a portion of the low frequency response is also drawn in grey This is to remind the user that insufficient information is available to make any correction below this frequency A way of obtaining quasi anechoic low frequency measurements is making close up measurements Working with such measurements requires a good deal of interpretation but it is doable Important Avoid making any corrections for which no anechoic data is available If reflections are included they are guaranteed to dominate the measurement at low frequencies and you will end up making corrections for circumstances that are highly specific to the room in which the measurement was made Power response data can only be made in a proper echo chamber or preferably by collating a large number of anechoic off axis measurements A reverberant2. 11 AKB 210DSP User manual revision 5 Sub out On all setups there is also the ability to use the Line out sub This can source an active subwoofer module The sub output has up to 6 biquads for filtering that can exclude the use of an external subwoofer filter Linking When 2 modules are used these two can be linked by a trigger cable This cable holds device data and also carries an audio channel on analogue source If the digital board is installed then the SPDIF link cable can be used to communicate between the 2 modules This cable is placed from master SPDIF out to slave SPDIF in cinch The trigger cable is no longer needed in this setup On USB audio input on the master the SPDIF output is also used for linking master to Slave 12 AKB 210DSP User manual revision 5 Software installation System requirements Pentium class or higher 64MB RAM USB1 0 or higher Tested on Windows XP Vista and Windows 7 All files are compressed in the setup zip file This zip file contains a DLL file for communication and a EXE file which represents the IMG DSP filter design program 1 Unzip the setup zip file on your hard disk 2 Openthe IMG DSP filter design EXE by double clicking the file Control panel Now the program is ready for use You see the following window called the control pan el Force Input Active input Setup Select Master position e Auto Detect O Analogue e 2 Channel C Analogue SPDIF
3. Work flow Measurement Measuring using the DSP unit set to flat Perform impulse response measurements for each driver separately Save the entire impulse record truncation can be done later on the filter design program Measuring using an external amplifier A separate amplifier may also be used for measuring the drivers provided the amplifier s output impedance is as low as the DSP unit s Importing response data Select the tab for the channel you want to import and click select The filter designer expects the impulse response measurement as a text file with one sample per line There is no restriction on the absolute gain of the impulse response data The only thing that matters is that the absolute gain be the same for all three measurements The filter designer computes a gain offset based on all loaded responses to centre them collectively on the vertical scale Truncating response data Switch to the impulse or step response graph 17 AKB 21 ODSP User manual revision 5 lil li i A i Figure 12 The first echo is apparent at 5ms Zoom in until you see only the anechoic portion of the impulse response Dragging the mouse left button down from left to right marks a zoom area Dragging from right to left zooms out Dragging with the right button down pans the plot left and right 18 AKB 210DSP User manual revision 5 Magnitude Impulse Step
4. C USB audio USB audio C Bridged Group Volume Subout Control 96 L R Left C Right Update Mute BE gt a Connect Control panel File View Help O SPDIF Stereo Figure 7 When the program is running connect your AKB 210DSP to your pc by the USB cable Windows will automatically detect and install the AKB 210DSP and the USB audio device digital version only When the installation is done the connected window will appear and the connec tion light will turn green You can also manually make a connection by the connect button on the bottom right of the control panel Figure 8 Now you can adapt the settings of the AKB 210DSP real time through USB On the left of the control panel you see the Force input and active input groups This shows you the settings of the audio inputs of the AKB 210DSP and lets you control these inputs only when digital audio board is added Audio can be provided in 3 ways analogue SPDIF and USB audio The selection of any of these inputs can be automatic auto detect This means that when any of the inputs is presented there will be switched to this channel automatically This is done by setting the analogue input 13 AKB 210DSP User manual revision 5 as the standard source During analogue in the other two inputs are scanned for any valid signal The first channel that contains any valid audio is selected and becomes the new input source But if you put in the USB cable but y
5. Shel M Show Filter TT Show Filtered Driver es Cn Aaymmotiic Shel 6 M Show Biquad Show Sum cr fa Boost Cut f II Fit vedat complete CA Firmware version 1 2 Figure 16 11 When download is completed you can power down the module 12 Start with the SLAVE module Slave 1 a 3 Start the pc program IMG filter design Or go back to the control panel ctrl c if the program is still running Plug in the power connector and switch the module to ON Plug in the USB cable assumed that you ve already installed the software as described in Software Installation chapter Wait for automatic connection now the program detects a slave module this is shown in a popup If connection is not automatic then press the connect button If there is no response there is a problem with the USB connection Switch to the Filter design Window under view or press ctrl f Fill in your biquads with the desired filters or use the same filters as the master module In this preliminary software the high channel is channel 1 and the low channel is channel 2 Download the filters to you module under Download or press ctrl F9 24 AKB 210DSP User manual revision 5 8 When download is completed you can power down the module and disconnect the USB cable 9 Master and Slave are now set up as a 2 channel stereo system Final setup When both modules are installed it is time to complete your setup First connect your speakers as explained i
6. active subwoofer 25 TiO CAVE GO LG PR tacaadeteacdedeteacdedettaddacdoas rea 27 AKB 210DSP User manual revision 5 Product description Type remarks The first time the AKB 210DSP is used all biquads are zero so there are no filters installed Connecting any speakers and audio input at this point may cause some damage to them Take notice on what changes you make changing a 2channel filters to flat can damage your speakers because both channels may be full range After updating the firmware please be sure to also download the latest version of the manual from our website Firmware version 2 4 Oct 2011 Key features Compact design Personal Computer controlled Two 180W Class D power amplifiers Pop free start and stop control Stereo analogue input Subwoofer output Fully user customised filtering Button panel controlled Remote controlled Link communication master slave only with two modules Low signal to noise 100dB Optional features by adding a digital audio board SPDIF stereo audio input Input sample rates up to 192kHz Link communication trough SPDIF link cable one cable for audio and link USB audio input Low signal to noise 104dB AKB 210DSP User manual revision 5 Applications With one module the following applications can be set up further explained in the Hardware part chapter M Stereo passive filtered system M Briged mode for single subwoofer max 140Watt short term into 8 Oh
7. is ae defined by the zeros Thus the same filter with opposite gains will cancel The first step is equalising the magnitude responses of the drivers flat over their entire useable frequency range The weapons of choice are shelving filters and boost cut sections A sharp peak followed by an equally sharp dip can be corrected using a second order shelving filter with a high Q Exercise care when deciding what to correct When correcting for diffraction errors do not exceed a Q of 3 lest the cure be worse than the ailment Errors that are caused inside the driver or internal cabinet resonances that emanate through the same diaphragm may be corrected ruthlessly provided the measurement has sufficient resolution to pin them down 20 AKB 210DSP User manual revision 5 As a rule of thumb sharp dips are diffraction artefacts while sharp peaks are caused by the drivers themselves Exceptions are room resonances if the response is not correctly truncated and diffractions on repetitive patterns The second step is designing the actual crossover filters All the usual strategies work Delaying higher frequency drivers with respect to lower frequency ones is a powerful alternative to using asymmetric slopes and yields substantially improved coherence through the crossover region Download Under download the user can press load DSP to download its designed filters to the AKB 210DSP This will store the filter settings into the memory
8. not O 0 1000 us for subout channel Supported digital sampling 32 44 1 48 88 2 kHz input rates rates 96 192 tenes to 48kHz Gain deo dB volume at 0dB Analogue Latency 12 ms SPDIF latency 1358 ms 100Watts is the maximum of the total unit AKB 210DSP User manual revision 5 Remote control The master unit is fitted with small keypad which can be placed in the front of the loudspeaker cabinet Volume and idle on is controlled by the pushbuttons and by an infra red remote control When 2 AKB 210DSP modules are used only one control panel is needed cause the trigger communication between master and slave There is also a touch panel available AKB 210TP This can replace the standard control panel The use of an Inferred remote control adds the ability to switch input channels with the up and down buttons of the remote The AKB 210DSP uses a standard RC 5 TV protocol for Infrared control Product overview Before you can use the AKB 210DSP in your particular setup you first have to set the right settings This is done by pc software called IMG DSP filter design Please do not connect any speakers to your system yet When you want to set up a system with the AKB 210DSP you apparently know what you want So with this information you can setup your system as follows Stereo setup in this setup you use one AKB 210DSP module for driving two passive filtered speakers Bridged setup the possib
9. Active Speaker Module with DSP Technology WWW IMGSTAGELINE COM CT Stage Line AKB 210D5P DIGITAL ACTIVE SPEAKER MODULE DSP OPERATED USE INTERFACE AKB 21 ODSP Bestellnummer 38 0220 C INSTRUCTION MANUAL ELECTRONICS FOR SPECIALISTS ELECTRONICS FOR SPECIALISTS ELECTRONICS FOR SPECIALISTS ELECTRONICS FOR SPECIALISTS AKB 210DSP User manual revision 5 Table of contents Product CLES CRAP UL ON RER 3 TOPE LEMA a da EA 3 A NN ET ER IS ene 3 Mi e A dry EEEE E EE 4 CONNECCION S remem A O A Pe 5 SUS ECM OVA OM see ne nd ete da mes iC D S PICES SR re erence eee a ce und T HardWare A FERTIL CC TUTE rial di RU N EROS RES ENE FREE ES FREE AKON 8 Digitarandionnp ite E area nen at arent ee 8 AUCIO performance ddl 2 443 RE A 8 REMO CONTO porra 9 Produc OM tt iia besa BEATE 9 eg A te TERESE ERE DET iii tient TETAS eine ais 10 SUD Una naaa daa aaa 12 eve Rastes sh EEEO 12 Sotware TASC Ul Ol near ture etant 13 Hi o AA A eee Ree 13 IIDUE OD TIONS an ee dt tonne dd Ole sees Ehe 14 LEE A CSIC PR E O sos ty 15 CAD CS Ch VERNER GERNER DERE SEN EK ant tenuate SETE tnt OR tn er Tnt E a nt au 16 Filter Definition Area iii 16 A e e vi O CE E O ide eo 17 WO ao a 17 MeUS remettant ent Manor 17 Beaming MN Er SR O E let Siete 20 DOMO ir atadas ata ERE neve EP ne bat 21 A O END EEE EDEN 21 PAMPE Sorrir TEN ENE ERE EN ERNE EPE nad handed ate 23 Example 1 2 channel st r o Sr a te 23 Example 2 Stereo setup with
10. Biquad Section radio buttons in the middle The Subwoofer lineout has only 6 biquads sections for only simple filter settings To the right is a settings area specific to the type of function selected Unused biquads are set to unity The selected biquad is edited by selecting a function and setting relevant parameters The delay has a maximum value of 1000us for channel 1 and 2 The subwoofer channel does not include any delay Distance is calculated by sound speed delay distance maximum distance is therefore 340 29meters 0 001secondes 34 029cm Note that the minimum step size is O 26cm cause the sample rate of 468 75Hz The sample frequency is not the standard 48kHz because of internal clock source also needed for USB connection 16 AKB 210DSP User manual revision 5 Settings window 10 x Measurement Sampling Rate 2 150000 Processor Sampling Rate Hz 192000 Graph Smoothing octaves 0 125 Source HEX fil Select Close The settings window is under File gt Settings Measurement sampling rate sets the sample rate used in the imported response files typically 48kHz Processor sampling rate is that of the IMG DSP hardware Note that this setting does not control the sampling rate of the hardware Rather it informs the filter design application of what that sampling rate is In short leave this at the standard value The select button opens a file dialogue box witch is not used in this application
11. alogue audio input This analogue signal is converted to digital processed by the DSP and then converted back to analogue A microcontroller controls the DSP reads the control panel and communicates with the PC and or another AKB 210DSP that may be attached Digital audio input The optional digital input board plugs into the main PCB and carries two RCA connectors SPDIF in and SPDIF through Incoming SPDIF is linked through directly to the output and sent to the DSP through an asynchronous sample rate converter ASRC for jitter removal The USB part adds a hub and an audio device which in turn also transmits audio over the ASRC to the DSP The ASRC chip scans its input for whichever signal is active In a stereo setup and in digital mode the SPDIF through cable doubles as a master slave link obviating the need for the mini jack cable The mini jack cable remains functional though and does not have to be removed Audio performance data MBW 20kHz unless otherwise noted All filters set to unity Noise levels unweighted mpu Um Se ve input impedance 10k _ Ohm Analogue cinch inputs Outputlevel gt go St 100 W Into4Ohms e SI s2 100 W Into4Ohms 2x A5Weye S1 so W nto 8 Ohms o 2 TT so w mosom MS poe tas A 104 Total harmonic THD N 05 0 07 distortion Noise 20Hz lt f lt 20kHz DRE Analoguesamplingrate fs 48 kHz Delay per channel JO JO 3403 cm SEE in software
12. e stored in memory Input options Use this dialog to match the input sensitivity of the MAA analogue inputto the full scale output level of your analogue source max 2 2V This helps prevent gania Adea E a annoying loudnessjumps when switching between E ge i FAT y digital and analogue sources a aay 1 237 Gain can be changed in steps of one dB and only for the analogue input Figure 9 14 AKB 210DSP Filter design When you want to make some filters for your module they can be designed in the Filter design Under view there can be switched between the control panel and the filter design window The following pages will give you a widespread instruction of the possibilities of the program fp DSP Filter Designer Ele Magnitude Impulse Step fp Control panel User manual revision 5 Analogue SPDIF USB audio put Setup Select e 2 Channel Analogue O SPDIF USB audio C Stereo C Bridged r Master position CE EX Left C Right C Mid Sub C Side Subout Control Group Volume ie L R Left Right M Mute 4 E fee Connect Figure 10 181 xj Y ha FA y J RA Vase Channel 1 Tweeter Channel 2 Midrange Channel 3 Woofer r Measured response Como MAIN woofS3c
13. em dat f Show Common Settings Biquad Section Delay fus lo 1 Os Gein 68 faz 1 Inven AS Ca fg iv Show Filter V Show Filtered Driver Ca 3 f Show Biquad Y Show Sum F E O Function Second order shelving te Unity FE Centre Frequency 65 9 oT Pur Q Factor 7 15 C HPF Gain 03 a HPF2 C Shelf C Low Shelf ts 5 High Shell C Asymmetric Shelf Boost Cut Figure 11 15 AKB 210DSP User manual revision 5 Graph Area The magnitude tab shows the imported driver responses filters individual biquads individual filtered driver responses and the sum Colour Function gt gt gt Having all of these on at the same time quickly produces an intractable mess so these graphs can be separately enabled or disabled in the filter definition area The impulse or step tabs show the time domain response of the imported drivers and the sum response and are used to demarcate the anechoic portion Filtered midrange response Filter Definition Area The three channel tabs labelled Tweeter Woofer and Subwoofer are functionally identical The top left frame is used to import response files The select button opens a file The show checkbox turns display of the measured graph on or off The Common Settings box controls global gain for each channel delay and the visibility of plots The amplified channels have up to 12 biquads selected using the
14. em to the desired setup for this example a 2 channel where the master represents the Left speaker Control panel Ce DER File View Help Force Input Active input Setup Select Master position Auto Detect amp Analoque 2 Channel e Left Analogue C Right B SPDIF C Stereo SPDIF C Mid Sub USB audio USB audio C Bridged C Side Group Volume Subout Control te L R Left Right Update a Connect M Mute al Figure 15 T When needed set the desired input for now just leave it Auto detect Note that in auto detect the USB source is selected when the module is connected to the pc 8 Switch to the Filter design Window under view or press ctrl f 9 Fill in your biquads with the desired filters in this preliminary software the high channel is channel 1 and the low channel is channel 2 10 Download the filters to you module under Download or press ctrl F9 23 AKB 210DSP User manual revision 5 fp DSP Filter Designer BEE Bile Vew Download Help Magnitude Imputss Step 100 000 Channel 1 Tweeter Channel 2 Wooler Subwoofer Measured response Functor Boost Cut 12 technical product information AS2 Select F Show Unity F LPFI Common Settings Biquad Section C LPF2 Q Factor f 59 we ger r Gai Delay us fo Y Include Fa TR 3 pels gt Gain dB a0 M Invert rs or ig Centre Frequency 3000 0 Shell 3 04 0 C
15. ility to bridge both amplifiers on the AKB will enable you to get more power at higher loads This setup is especially useful for driving a subwoofer 2 channel setup A 2 channel setup will allow you to make a two way active speaker Each amplifier of the AKB 210DSP will drive one driver of the speaker i e high mid or low In this setup you will need one AKB 210DSP per speaker A combination of the above mentioned setups is also possible for example a stereo setup with an active subwoofer with an AKB 210DSP in bridge mode see Figure 4 AKB 210DSP User manual revision 5 Right speaker Stereo lo audio in 6 __ SLeft speaker Control 9 Panel oi OO s Subwoofer Figure 4 Hardware part Stereo setup Connect the module to your pc by a USB cable and select on witch side of the room your master module will be the speaker with the AKB 210DSP When your master is the left channel the slave will become the right channel The slave speaker can be connected by the banana plugs on the AKB 210DSP qQ 0 S Left speaker Figure 5 10 AKB 210DSP User manual revision 5 Bridged setup 2 Channel Connect the module to your pc by a USB cable and select where the master module is placed master modu
16. le is left or right audio or functions as a sub woofer When you use 2 AKB 210DSP for a stereo bridged setup you will also have to initialise the second slave module see example in the last chapter of this document In bridged mode the jumper see Figure 2 must be placed and the speaker must be connected between J4 speaker and Je speaker In all other setups the jumper is not placed When you want to set the master as right channel with analogue input you will have to change the input cinches left in the right cinch and right in the left This is because only the right channel is linked trough so if you want the left channel to be linked trough you just switches left and right For digital sources the left and right channel are linked Connect the module to your pc by a USB cable and select what kind of 2 channel you want to setup When you want to set the master as right channel with analogue input you will have to change the input cinches left in the right cinch and right in the left This is because only the right channel is linked trough so if you want the left channel to be linked trough you just switches left and right For digital sources the left and right channel are linked An example is given in the last chapter of this document trigger Stereo 2 right ch dl audio in LF HF Control Panel Figure 6
17. measurement in a normal live room just won t do The steps of loading and truncating data can be repeated at any time This can be particularly practical when combining close up and far field measurements during the filter design phase The window in Figure 13 shows the result of this The small knot of corrections made around 0Hz is based on close up data first loaded separately The LF section of the test mule is quite smooth apart from one internal standing wave 19 AKB 210DSP User manual revision 5 Designing filters Unity Section is not used LPF2 Cut off frequency asymptotically Second order lowpass A Q of 0 71 Q corresponds to butterworth 0 5 corresponds to LR2 Two identical sections with a Q of 0 71 form an LR4 filter Cut off frequency asymptotically Second order highpass A Q of 0 71 Q corresponds to butterworth 0 5 corresponds to LR2 Two identical sections with a Q of 0 71 form an LRA filter Shelf1 Centre Frequency halfway point First order shelf Useful for baffle Gain step correction Direction Centre Frequency halfway point Second order shelf Useful for Shelf2 Gain correcting internal cabinet Q resonances and for the midband Direction peak dip combo of most midwoofer speakers Asymmetric Shelf Pole frequency and Q Equalising the bottom end of Zero frequency and Q closed box woofers with large magnets Boost Cut frequency Dip peak filter For peaks Q is defined by the poles For dips Q
18. ms M Mono mid 2 way setup tweeter sub When two modules are used the following applications can be set up also explained in Hardware part M 2 way active filtered stereo system M 2channel system with active subwoofer M 2channel system both modules in bridge mode for more power All setups are possible with both analogue and optional with the digital audio inputs SPDIF and USB Note that all setups have the ability to use an extra channel by connecting an active subwoofer to the subout By this you will have the opportunity to build a 3 way system AKB 210DSP User manual revision 5 Connections fo o Sage line SPEAKER CHI AKB 210DSP DIGITAL ACTIVE SPEAKER MODULE DSP OPERATED USB INTERFACE Figure 1 Overview of the connections on the front of the AKB 210DSP Function Amplifier output for slave speaker in stereo setup Analogue input left channel 5 000 Analogue input right channel 6 Ba Subwoofer output On Off switch USB control input r i Oxo yO O AKB 210DSP User manual revision 5 Fragen UUO Right channel trough Main Fuse 230 volt input SPDIF audio input SPDIF audio output Audio trough for slave module USB audio input Figure 2 Overview of the connections on the back of the AKB 210DSP Function Transformer connection JP1 Bridge jumper J4 Stereo Left channel output 2 channel Low channel Pin1 left S
19. n chapter Product overview Connect the trigger cable mini jack or SPDIF cable between both modules depending on the used audio source Power up master and slave module Turn on the master by control panel or remote Lower you source volume prevent loud start up volume Connect your source to the AKB 210DSP Ready Now the system is fully setup and can be controlled by the control panel remote control or by connecting the module to your pc From now on you can update your filters at any time just repeat the Master and Slave steps If your slave module is not turned on by the master try to power down the slave turn the master off wait 5 seconds power up slave and turn the master back on When there is something that does not work try to repeat the installation Example 2 Stereo setup with active subwoofer This example describes how to set up a stereo passive filtered audio system plus an active subwoofer with or without filtering with use of one AKB 210DSP This setup is shown in Figure 5 At first you have only a AKB 210DSP with no cables connected 1 Plug in the power connector and switch the module to ON 2 Power up the module by the control panel or remote 3 Start the pc program IMG filter design 4 Plug in the USB cable assumed that you ve already installed the software 25 AKB 210DSP User manual revision 5 11 12 13 14 15 Readu Software installation Wait for automatic connection a popup is di
20. of the module Save Files Under filter design there is an option to save all filter settings together with the measurements so it can be reloaded afterwards Till now it is not possible to read back the filters out of the modules During the update from version 1 to 2 of the IMG filter design software we had to make some changes in the save function Therefore it is not possible to use save files made in an earlier version as V2 21 AKB 21 ODSP User manual revision 5 22 AKB 210DSP User manual revision 5 Examples Example 1 2 channel stereo setup This example will guide you through setting up you 2 channel stereo system with the AKB a schematic presentation of similar setup is given in Figure 6 The master module is always the one with the control panel connected First you got your 2 modules with no cables or speakers connected Master 1 Plug in the power connector and switch the module to ON 2 Power up the module by the control panel or remote Blue LED goes on 3 Start the pc program IMG filter design 4 Plug in the USB cable assumed that you ve already installed the software as described in the Software Installation chapter 5 Wait for automatic connection a popup is displayed as in Figure 8 If the software doesn t connect automatically press the connect button If there is no response there is a problem with the USB connection or your operating system that can not detect the USB device 6 Set the syst
21. ou want to use the dnalogue input you can force the analogue input to be used This can be done for all inputs the options Analogue SPDIF and USB Audio When the module selects one of the inputs this is shown by the active input lights Under the Setup select part the system setup can be selected There can be chosen between 2 channel Stereo Bridged Master on the left Master on the left Master on the left Mid Sub R FS LR O eR O O OO Only on digital audio board for analogue version cinches has to be changed like described in Hardware part The output signal of the subout channel is controlled in the Subout control panel Normally this will be set to L R to use one subwoofer but if you want to use a subwoofer on both sides you can set the subout to only use left or right input signal The last thing that can be controlled in this window is volume This can be done by setting the scrollbar to a desired position or by typing the value in the volume field this value is send when pressed enter All of the configurations made here will be redirected from master to slave when presented So there is no need to connect the slave module to the pc The slave module is always the opposite of the master so master left will set the slave to right This is done automatically because the module knows whether it is master or slave Only when the module is switched off by remote all settings like volume and setup ar
22. ource Now the system is fully setup and can be controlled by the control panel remote control or by connecting the module to your pc From now on you can update your filters at any time just repeat the steps of this example 26 AKB 210DSP User manual revision 5 Technical data Supply voltage 230Volt AC 50Hz 10 Dimensions 115mmx200mmx60mm WxHxD Plate thickness 2 5mm Weight 1 5 kg Clearance 9mm 115 0 mm SS O OT E SPEAKER ps AKB 2 10DSP E z DIGITAL ACTIVE S SPEAKER MODULE a 8 7 DSP OPERATED USB INTERFACE a TRIGGER FUSE 230V 150Hz OFF POWER OW L__ 105 6 mm 21
23. peaker Pin 2 right Speaker Je Stereo Right channel output 2 channel High channel Pin1 left Speaker Pin 2 right Speaker Physically the same as connector J2 AKB 210DSP User manual revision 5 System information Link cable Right through IR control Figure 3 Description The AKB 210DSP is a plate amp for use in powered speaker systems As an active speaker controller a AKB 210DSP can form the basis of a powerful active two way monitor Instereo mode one AKB 210DSP will power an active master passive slave pair Finally the module may also be used as a one way 140W amplifier All signal processing including volume control is done using the on board DSP digital signal processor Figure 3 shows the block diagram of the amplifier When two modules are used the second unit Slaves to the first unit master through a link cable The link cable a stereo mini jack cable carries both the right audio channel and control data This way both units respond to the master s control panel A PC controls the AKB 210DSP through the USB port This connection is used to upload the configuration and filter settings An optional board permits use of the USB link for audio as well as an SPDIF link In digital mode master slave linking is done through the SPDIF in out connections instead of the mini jack cable AKB 210DSP User manual revision 5 Hardware Architecture The standard version of the AKB 210DSP has a stereo an
24. splayed as in Figure 8 If connection is not automatic the press the connect button If there is no response there is a problem with the USB connection or your operating system that can not detect the USB device Set the system to the desired setup for this example stereo left because the left speaker holds the AKB 210DSP module Set the Subout control to L R because one subwoofer is used Control panel File View Help Force Input Active input Setup Select Master position e Auto Detect Analogue C 2 Channel C Analogue C SPDIF C USB audio USB audio C Bridged Pica Left O SPDIF e Stereo Group Volume Subout Control 9 Left C Right Update me a a Connect Figure 17 When needed set the desired input for now just leave it Auto detect Note that in auto detect the USB source is selected when the module is connected to the pc Switch to the Filter design Window under view or press ctrl f Fill in your biquads with the desired filters For the stereo setup you don t need to set any filtering for channel 1 left speaker and channel 2 right speaker but you got the ability to use them Set your Subwoofer filtering if required Even when you don t want to use the filters you still need to set them to unity Press download or use ctrl F9 When the download is complete the setup is done Connect the right speaker to the Amplifier out connector and your subwoofer to the Line out Sub Present your audio s
Download Pdf Manuals
Related Search