DLCP manual R3
Contents
1. 1 13 3 1 1 Example 1 DLCP as preamplifier sssssssssem mmm 13 3 1 2 Example 2 DLCP as active loudspeaker 1 14 3 2 eee meen E M MM M M LM E ME eee 15 A CS m EE 16 Bo aa e DON 16 4 2 DVEF CONE O ar 16 4 3 T 16 4 4 Software ONGC OM MR 16 4 5 So ee ee eee 17 4 5 7 om 17 4 6 SM RR D _ ee 18 4 6 1 ND pee pears be segs 19 4 6 2 Filter m m 19 4 6 3 Settings WINGOW 20 4 6 4 VE VSS WNA W RE TTL 20 4 6 5 Pide 21 4 6 6 WOK OW eian A 21 4 6 7 Br nmneuic cc NNNM 23 4 6 8 TRIER TET 23 4 6 9 Xe NER nent 23 Firmware 24 4 1 1 pire 24 4 2 00 0 ae 24 4 8 PP UMMC OOMOO T 25 4 8 1 DEERD E E Pod E EA 25 4 8 2 Ae O E A EE E 25 4 8 3 26 ME2. E J T e 5 n K f T J 6 am 5 a met gt 2 E 7 i g E Ti M fat d a S F E 0 olf n i t 7 2 EC 5 o AL 4 a 5 Io off bei 2 x gt 3 i E a S Vo f uli M E 4 lt _ Tel J 5 u 2M 7 i i e gt 4 2 G 4 z 1 4 4 H En 6dB 5 i d e d w e 4 A Ft 2dB Qi A LA f AUT 4 3 4 2 v pes AMA 1 lt B iJ Jols gt m os 1J 8 m j e JA gt i o 4 te T 3 C eocGmt wseced 5 gt at hs 3 5 I 3 EX T 23 i lt amp I y M z us Z 9 QA d 8 BI EPS E UsSUWUSWUUSWH 7 1 4 7 i L x E aks a J1 J2 4 J3 e e eoooooo 2 J 1 M um LA L LA ANALOGUE OUTPUT ANALOGUE DIGITAL INPUT J SUPPLY INPUT vo e e e e SUPPLY INPUT gt 1 amp EAS CH1 OUT CH2 OUT CH3 OUT CH4 OUT CH5 OUT i 2 5802 s Figure 1 Overview of the connectors on the DLCP Name j Function __ 1 Analogue audio outpu
3. Top view OST Y i 8888 8888 8888 6666 8888 __ 8888 24 5 24 5 24 5 24 5 26 5 4 26 5 26 5 358 Please download the 2D 3D files from our website 5 3 DLCP control board Front view 3 0 Y 150 0 j LT LI a 21 0 101 0 aaa gt 53 0 gt 45 0 150 e 170 NOTE RJ45 connector not on picture Please download the 2D 3D files from our website 29 User manual R3 DLCP DISCLAIMER This subassembly is designed for use in music reproduction equipment only No representations are made as to fitness for other uses Except where noted otherwise any specifications given pertain to this subassembly only Responsibility for verifying the performance safety reliability and compliance with legal standards of end products using this subassembly falls to the manufacturer of said end product LIFE SUPPORT POLICY Use of Hypex products in life support equipment or equipment whose failure can reasonably be expected to result in injury or death is not permitted except by explicit written consent from Hypex Electronics BV Warranty The work carries warranty out for all provable material and production defects for the duration of 12 months starting from sales All damage which is caused by wrong or inappr
4. mm 28 5 1 pto Y O 28 5 2 DLCP input 29 5 3 DUCPConEFOl DOAI re cM D Li MM MEE 29 0 ROVENA NR mm 30 User manual R3 DLCP 1 Product description 1 1 Type remarks Use only a version 2 8 or higher of the Hypex Filter Design program In earlier versions the DLCP is not yet implemented Static electricitu can cause damage to this product The first time the DLCP is used all biquads are zero so there are no filters installed Connecting anu speakers and audio input at this point may cause some damage to them Take notice on what changes you make to prevent a setup which can damage your speakers After updating the firmware please use the combining PC software downloaded from our website www hypex nl The purpose of this manual is to describe the functionality and contents of the Hypex Digital loud speaker cross over Platform DLCP from Hypex This document includes instructions for operating the board and descriptions of the hardware features For more detailed information on connectors and specifications one should read the datasheet Before reading this manual make sure you have the latest version The latest version can be found at www hypex nl 1 2 Highlights Fully user customized filtering Great audio performance Field updatable fi
5. The amplified channels have up to 15 biquads selected using the Biquad Section radio buttons in the middle 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 bu selecting a function and setting relevant parameters The delay has a maximum value of 10000us for each channel Distance is calculated by sound speed delay distance maximum distance is therefore 340 29meters 0 01secondes 340 29cm Note that the minimum step size 15 0 363cm cause the sample rate of 93 50 19 E LF SKF RA SZ electronics h 6 3 Settings window Options settings Link Channels DLCP options Measurement Sampling Hate Hz 42000 Processor Sampling Rate Hz 33750 Graph Smoothing 125 Figure 19 User manual R3 The settings window is under Tools gt Options gt Settings Measurement sampling rate sets the sample rate used in the imported response files typically 48kHz Processor sampling rate is that of the 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 4 6 4 Link Channels window Options Settings Link Channels DLCF options From Here you can link channels with eachother The upper side tells you where you from and the left side is where you copy to Whe
6. It s impossible to undo this action The break lines are marked with the red lines sum mm 1211 J12 4 Figure 5 User manual R3 DLCP 2 5 1 3 Settings JoB pup J3B n y p EX electronics 52 5 54 AES in select AES out select AES out select J8 or J4 DLCP1 or JS or 5 B C v vv yer AES In ES Ou J9 E N Figure 6 52 S2 selects the AES input for the DLCP connected to J2 J3 set in the position shown in Figure 6 in order to use the digital XLR input and other position to use the AES input from the control cable 53 Set the switch in the position in Figure 6 if DLCP is connected and other position if there is an other DLCP connected to J2B J3B S4 Set in position shown in Figure 6 to use J9 as digital XLR output or in the other position to send the digital signal thru the control cable this can save cabling when using the AES as input in combina tion with more input boards 51 Set in down position to connect the USB cable to DLCP 1 connected to J2 J3 set in the up position to control DLCP 2 connected to J2B J3B S f This switch selects the source for the cinch digital output 7 white Set the switch in the position shown in Figure 7 if one DLCP is connected set in the other position if there 15 another DLCP connected to J2B J3B S PDIF out select DLCP1 or DLCP2 ypex Electronics BV 295380
7. c z Gg obo s Cea COLIT D Left channel amplifiers 2 uu m m ou D ou Input board Pre amplifier Figure 14 The hardware setup looks quite similar to the pre amplifier setup Although the software settings may be slightly different 14 User manual R3 DLCP 3 2 Application notes The DLCP has to be placed in an enclosure with enough airflow Please mount the DLCP with spacers on a solid surface four mounting holes are connected to ground with a 100nF capacitor Connect them all to chassis with a metal spacer for optimum EMI performance Please use the amp enable pin to guarantee a pop free startup and shut down of the connected am plifier Please use the XLR input balanced even if the source is unbalanced For more information how to benefit of a balanced connection even with an unbalanced source please see this document http Wwww hupex nl docs wiring pdf And Chapter 12 of http www hypex ni docs NC400_datasheet pdf 15 User manual R3 DLCP h Hypex Filter Design After setting the right hardware settings you ll have to configure the software side This is done by pc software called DSP filter design Please do not connect any speakers to your system yet 4 1 Target response To target a linear phase response from a loudspeaker may not alwaus be optimal When the phase response of a system is perfectly linear and the amplitude r
8. E M DLCP Inputboard 2 out select Set S5 in the position as shown in Figure 8 if one DLCP is connected set in the other position if there is another DLCP connected to J2B J3B Set S6 in the position as shown in Figure 8 if this input board contains the last DLCP in the chain In this way the last DLCP sends it control output back to the DLCP control to make a loop Set S6 in the other position if there is an other DLCP connected to J5B J5B Figure 8 10 User manual R3 DLCP gm b L D P si P wm r wx 2 X 3 b r r EL come 56 j b MEM 4 Left 0 Dow T j n 2 Figure 9 The serial interface permits control of volume channel assignment and input selection without the need of an USB connection This control board can be connected to the input board described above with only one straight through 8 wire cat5 cable with RJA5 connectors max 10 meter This controller board contains a LCD displau which shows the settings and contains an IR receiver for an IR remote controller The IR remote not included can control volume mute input and power When 2 or more DLCP modules are used only one control panel is needed 2 5 2 1 Connections Front view Figure 10 Back view 8 m ijo S Gc d 65 jam Ta 5 BR 825 P lt n 59 s So i zii e9 El B
9. digital sampling rates Fs 32 44 1 48 88 2 96 kHz input rates con 192 verted to 93 bkHz Note 1 5 J5 J8 in Connections User manual R3 DLCP 2 3 Recommended A Recommended operating zondi Conditions Typ Max Unit Supply voltage S 185 2 De A and negative sup voltage Note 1 Unit shuts down when the positive rail drops below 15V Note 2 Especially on high supply voltages make sure there s enough airflow to cool the regulators 2 4 Hardware Architecture 2 4 1 Analogue input The DLCP has two stereo analogue balanced audio inputs The analogue input signal is buffered and amplified bu a single stage fullu differential programmable gain amplifier and then converted to digital by the ADC The ADC is always directly clocked by the on board oscillator low noise Colpitts oscillator with a locally regulated supply causing less jitter After the analogue to digital conversion the signal is processed bu the DSP 2 4 2 Digital input The DLCP contains four separate digital inputs permitting the use of different interconnection Standards AES EBU and S PDIF Optimal clock quality is insured by routing the clock through sepa rate IC s from the data signals and by local regulation of all supplies on the AES input circuit Incoming AES S PDIF is send to the DSP through dn asynchronous sample rate converter ASRC to reduce jitter When the input is set to Auto detect the ASRC chip scans its inp
10. u s dnas p z SOA lt 294 305 jo uo spuadoag 4 DLCP u3234J25 51 129 96 81 96 enBojeuy t t 8PO T ONY yndu A Y 5 Y u TXH2 NOS A 14614 xH45 HNOS t JIQd S oipnegsn B cd Y TTHI unos Y 921nos 4 V9T H2 NOS gt lt 1u6ni pH2 unos lt 9 4nos E 1461y 9H gt D INOS ef 53 1 2 01 95 4 5 OTA B4eMYOS d21G Figure 12 User manual R3 DLCP 3 Product overview Before you can use the DLCP in your particular setup you first have to set the right settings hard ware and software This chapter describes the hardware part where chapter 4 describes the soft Ware part 3 1 DLCP setups The DLCP can be used in many ways therefore it s not possible to describe all options Please e mail to support hypex nl if you have questions about your particul
11. 0 004 0 004 0 004 0 004 0 004 0 005 0 005 0 005 Truncate Figure 23 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 15 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 highlu 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 collat ing a large number of anechoic off axis measurements reverberant measurement in a normal live room just won t do 22 User manual R3 DLCP The steps of loading and truncating data can be repeated at any time This can be particularly prac tical when combining close up and far field measurements during the filter design phase The win dow in Figure 23 shows the result of this The small knot of corrections made around 70Hz is based on close up data first loaded separately The LF sec
12. Control out If this connector is used don t use J5B __ S 258 ___ Control out If this connector is used don t use J5 __ J8 Digital AES EBU input __ O J9 Digital AES EBU output J318 Digital optical input __ O J10 jAndoguelleftinput SSS O J12 jAndogue2leftinput SSS O J313 Andlogue 2 righ tinput SSS O J14 Analogue 3leftinput gt SS O 215 __ Analogue 3 righ tinput SSS O J16 __ 4leftinput gt SSS O J2 Analogue Digital audio in and digital output header _____ User manual R3 DLCP 228 Analogue Digital audio in and digital output header for optionalsecondDLCP 23 MOconnector USB Relay Contro O 238 l Oconnector USB Relay Control for optionalsecondDLCP o Z o 11 52 AES in select WD L 000 S3 AES out select from DLCP1 J2 DLCP2 3B 1 1 00 Sh AES out select output 53 to J9 or J5 S 55 __ Control out select DLCP1 or DLCP2 1 0 0 O S6 jlastseleet _ J19 Forfutureuse 0000000000000 J20 Forfutureuse ___ 221 For future use o J22 jFforfutureuse 0000000000000 Note 1 Set S2 in right position Note 2 Set 53 and 54 in right position Note 3 Set S in right position Note 3 Set 55 and S6 in right position 2 5 1 2 Break lines It s possible to remove the last 1 or 2 analogue inputs to reduce the length of the input board
13. Hupex Electronics BV Kattegat 8 9723 JP Groningen The Netherlands 31 50 526 4993 sales hypex nl Www hupex nl User Manual R3 Digital Loudspeaker Cross over Platform DLCP User manual R3 DLCP Table of contents OF contento 2 1 Produc GOS Ci ON 3 1 1 3 1 2 T 3 1 3 Scared eared aoe ar eset mete E EE 3 1 4 Yo 0 4 1 5 NN ______ __ 6 _ 5 2 t MO OUD Emm 6 2 1 6 2 2 Bre audio perrormance ______________ 6 2 3 Recommended Operating Conditions enne nn nennen nnn nennen rni 2 4 mieige ie mE ACCME C TUTE al T T 2 4 1 Ando due T 2 4 2 Biogune l aT ot p RR eee EAE 2 4 3 8 EM T 2 4 4 DP A E Mu MM T 2 4 5 ERN RR E 2 5 NO ON T 8 2 5 1 DLCP Input board menm nnnm nnn nnne nnn nennen nnn nnne nnne nnn 8 2 5 2 DATE Ge d Ge a TNNT ER RNC 11 Produ tovore RR m 13 3 1
14. OINT When the progress bar is filled the update is completed On a CRC error the update is automatically restarted after three errors the update is aborted 24 User manual R3 DLCP 4 8 Filter example Example design using an existing M T M two way cabinet 4 8 1 The substrate The pre existing cabinet used here is not an example of good acoustic design A 1 dome tweeter is placed between two 5 woofers in perfect lateral and vertical symmetry The measured responses are as wild as would be expected 10 10 Pu Figure 24 The first reflection arrives after 8ms so this plot conveus no meaningful information about the re sponse below 200Hz Not shown is a separate close up measurement of the woofers to determine the precise low frequency response 4 8 2 The filters The following series of biquads is used to filter and correct the drivers Sedo UF Dip 648 Q 4 fc 2600 cen Dip 2dB Q 2 fc 10000 Dip 2dB 3 5500 Poles of HP Q 0 71 55 Allpass 1 order 600 Zeros Poles of HP 0 65 58 high BL woofers in a closed cabinet __6__ 2 Delay 180us The corrections were hand optimised because an automatic optimisation algorithm can t be ex pected to judge which corrections make phusical sense and which don t 25 User manual R3 DLCP 4 8 3 Result Amplitude response In blue the effective DSP crossover curves In red the individual driver responses with thes
15. P correction should permit a greatly optimised compromise between on and off axis responses by gearing cabinet design towards an improved radiation pattern and having the DSP correct consistent response errors of User manual R3 DLCP 5 Dimensions 5 1 DLCP Top view hype 103 00 mm 110 00 mm n 2 a lt OOS 6dB lt 5 Y N 12aB Q JK 2 J gt Ta 15dB lt lt o 2 a 8 j D 5 2 2a a x lt amp gt CH6 OUT 103 00 mm 110 00 mm Side view 30 mm Vn al Ig m m a AIZ 1 ii E t HH i Er E H 1 5 nl ua zu LM p 07 1 5 2 E m UE User manual R3 DLCP
16. V DLCP C v2 Figure 11 JP Display o O J2 iRreceiver S O S6 j leftbuton SS O O Sh Seectbuton S O S1 Rightbutton S O 55 Upbuton __ _ 3 Downbuttom SS O 52 On Off button 0 00 O J1 Control out connect to J4 J4B DLCP input board _____ 212 jFforfutreuse S O O 23 ____ Programming connector not used byuser SSS O R10 Display contrast adjust ooo 2 5 2 2 Menu structure On power up the controller receives the source volume and power infor mation of the first DLCP in the chain These settings will overrule the set tings of the other DLCP s in the chain The controller keeps the volume source power and mute settings equal for all the DLCP s in the chain The sources for the output channels can be different for each DLCP e g to use all six channels on the first DLCP for the left loudspeaker and the second DLCP for the right loudspeaker If the input is set to USB audio then the input of the other DLCP s in the chain can be chosen in the DLCP x set up menu The source for the other DLCP s in the chain can be set to S PDIF or CAT AES changeable in hardware by J2 on the input board User manual R3 12 oipny gsn 3104 5 9 dnos W TXH2 4nog S dmas enBojeuy p upyuonng sA 5 dmas gt 3 z zzz
17. active input and right for the right input signal Select L R to add the left and right input signal on that channel The L R option will subtract the input signals By default the output routing is set for a stereo 3 way setup Ch1 Left tweeter Ch2 Left woofer Ch3 Left subwoofer Right tweeter Ch5 Right woofer Ch6 Right subwoofer Please note that these settings are overruled by an control board if it s connected 4 6 6 Work flow 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 Please use the connected amplifier which will be used in the final setup A different amplifier may also be used for measuring the drivers pro vided the amplifier s output impedance 15 as low as the final setup amp 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 mat ters 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 collectivelu on the vertical scale Truncating response data Switch to the impulse or step response graph 21 Us
18. ar setup 3 1 1 Example 1 DLCP as preamplifier In combination with the optional DLCP input board with relays and control board the DLCP can be used as as a high high end act T Dre eT T example doesn t use the dedicated DLCP Supply Amplifiers Luo M 5 f z CX RE e Figure 13 The DLCP can be connected to the input board with two flat cables J2 on the input board must be connected to J2 on the DLCP Analogue Digital Input J3 on the input board must be connected to J3 on the DLCP 0 The DLCP Control can be connected to J4B on the input board to keep the wire internal The supply can be connected to the DLCP with J16 only V GND V must be present Optional the standby voltage can be applied to J17 please use the supply standby pin to shut down the main supply in order to use the standby mode The amplifiers can be connected J1 or J10 J15 preferably Optional an external LED can be con nected to J to indicate the power on off state 13 User manual R3 DLCP 3 1 2 Example 2 DLCP as active loudspeaker filter Its possible to use the DLCP as an active filter so you can build an active speaker It s possible to work without the Hypex DLCP input board to keep it as small as possible Then uou will have to make our oun adapters This example doesn t use the dedicated SMPS DLCP o o OF c 2G c cO F Right channel amplifiers cl DEDE pa tui a
19. e when Hupex provides a new firmware version The firmware can be simply updated by USB Please remove or turn off any connected amplifier first Under option download you can find Firmware update When this option is selected the user can select the new DLCP firmware file This is a complete hex file provided by Hypex no adapts can and may be made by the user After you selected the file the DLCP will enter its bootloader the device will reconnect and shows version 99 99 in the status bar Now you need to select the file again to load the new firmware into the module After the file is selected the update begins DO NOT DISCONNECT THE MODULE AT THIS POINT When the progress bar is filled the update is completed On a CRC error the update is automaticallu restarted after three errors the update is aborted Note that the new firmware does not have any filters installed so the filters must be reloaded with the correct values 4 7 2 Control board The control board firmware can be simply updated by USB Please remove or turn off any connected amplifier first Under option download you can find Control Firmware update When this option is selected the user can select the new control board firmware file This is a complete hex file provided by Hypex no adapts can and may be made by the user After you selected the file the control board will enter its bootloader and the update begins DO NOT DISCONNECT THE CONTROL BOARD AT THIS P
20. e filters applied Black shows the sum response The measurement is valid down to just below 200Hz d ais a 10 100 1000 1 10 ric Figure 25 The strategic placement of in total just 32 poles and 32 zeros corrects the response of this seeming lu hopeless loudspeaker to within 1dB or 0 3dB 3rdoctave smoothing Considering that fur ther correction would back fire in terms of off axis behaviour the chosen strategy is very efficient Step response The step response indicates that already after this modest effort the speaker achieves minimum phase up to around 10kHz som p 5 4 Toa T P a Figure 26 26 User manual R3 DLCP Phase response The phase response obtained is shown below At this stage optimisation was stopped but further corrections could provide minimum phase up to the 20kHz with just a few extra zeros Figure 27 Subjective eualuation Comparative listening tests on the test system show exactly the strengths and weaknesses that were expected based on the acoustic set up Mixes are picked apart with great ease too much so perhaps for home use and the subtlest of EQ changes become very obvious Stereo imaging is un characteristically good in all 3 dimensions for the low cost drivers used Good floor covering would be advisable on account of the symmetric dual woofer arrangement of the loudspeaker Taking full advantage of the added flexibility of DS
21. er manual R3 DLCP Magnitude Impulse Step 0 0 005 0 01 0 015 0 02 0 025 0 03 0 035 0 04 0 045 0 05 0 055 006 0 065 0 07 0 075 0 08 0 085 0 09 0 095 0 1 Truncate Figure 22 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 Magnitude Impulse Step 0 002 0 002 0 002 0 002 0 002 0 003 0 003 0 003 0 003 0 003
22. ers can be selected for best efficiency and distortion instead of electrical damping and the cabinet can now be fully optimized for radiation pattern Figu 215 a schematic representation of the DLCP A PC can control the DLCP through USB This connection is used to upload the configuration and filter settings USB audio can also be send thru the same cable It is also possible to update the firmware through USB Optional remote control is effected through a 4mA optically isolated current mode serial link signal processing including volume control is done using the on board DSP digital signal pro cessor The module has six Molex Microfit audio outputs which can be used to connect NC400 buffered UcD ST and HG modules The supplu can be provided bu the new DLCP SMPS or the auxilia ry output of a Switched Mode Power Supply module The DLCP can go into standby mode and shut down the power supply when an external standby voltage is applied and a controlboard is pre sent You can create a chain of DLCP s up to 6 to increase the number of DSP filtered channels 2 2 Brief audio performance data MBW 20kHz 20Hz 20Khz unweighted all filters set to unity unless otherwise noted Input level OdBFS C 19 Outputlevel Vyg 259 V 0486 DSP sampling rate fs 9375 kHz ADC sampling rate fs 9375 KHz Supported
23. esponse much worse 4 3 Crossover design A common practice in DSP based loudspeakers is to fit the acoustic response of individual drivers to a linear phase high pass low pass response Unless the listener is exactly on axis and in an anechoic room the pre ringing of both responses will not cancel perfectly Because of this it mau be more productive to optimize only the sum not the individual driver response Here too IIR filters are a more natural choice than the seemingly obvious FIR filter 4 4 Software installation System requirements Pentium class or higher 64MB RAM 0581 0 or higher Tested on Windows XP and Vista files are compressed in the setup zip file This zip file contains 1 DLL file for communication and an EXE file which represents the Hypex DSP filter design program 1 Unzip the setup zip file on your hard disk 2 Open the Hupex filter design EXE by double clicking the file 16 User manual R3 DLCP 4 5 Control panel Now the program is ready for use You see the following window feme called the control panel Figure 15 Tools He When the program is running connect the powered DLCP to your pc by the USB cable Windows will automaticallu detect C Analogue2 Analogue 3 and install the DLCP and the USB audio device HID devices C Analegue3 Analogue 4 When the installation is done the connection light will turn E v green and a popup appears with the tex
24. esponse still has minor ripples on it these ripples translate equally to time responses before and after the central impulse Psychoacous tic masking of pre echos is orders of magnitude less than masking of post echos If a minimum phase response is targeted no energy will be produced before the impulse This ex plains the paradox that listeners often report a minimum phase loudspeaker to have a tighter im pulse response than a linear phase one 4 2 Driver correction Loudspeaker units are minimum phase systems That is minus any acoustical delay the phase and log magnitude characteristics are eachother s Hilbert transform One property of minimum phase systems is that all zeros lie on the left half plane s domain or inside the unit circle z domain The poles always do of course Thus all poles and zeros can be canceled using IIR filters FIR filters are not needed to equalize the drivers s phase response The phase response gets automatically equal ized as the magnitude response is corrected using minimum phase EQ A consideration to be made is whether to iron out every last wrinkle or how much roughness is still permissible in the response One should realize that narrow bumps and troughs in the frequency domain correspond to responses long after the main event in the time domain usually reflections that change markedly with speaker and listener positioning excessive correction of the on axis response is guaranteed to make the off axis r
25. m Hypex just eere o Gah adst seting leave it at four Besides this you re able to change the C sees 17 d input sensitivitu of the analogue inputs to match the full C Ug Gain for analogue input 3 0 oor scale output of your analogue source This helps prevent annoying loudness jumps when switching between ES sources mas 125 H Figure 16 17 User manual R3 DLCP 4 6 Filter design Control panel When you want to make some filters for your module they can be designed in the Filter design Under view there can 22200008 be switched between the control panel and the filter design C Auto Detect Analogue 1 window The following pages will give you a widespread instruction of the possibilities of the program Please take euism C Analogue 3 Analogue 4 a look in the help file of Filter design before contacting support C Analogue 4 S PDIF C S PDIF USB audio USB Audio O AES C AES Group Volume Update m Connect Figure 17 Z3 Hypex DSP Filter Designer File view Download Edit Tools Help Magnitude Impulse Step 100 000 Function T Second order shelving filter Unity LPF1 LPF2 HPF1 Gain 03 HPF2 Shelf1 Shelf2 C A
26. n you have selected a checkbox a message will came up and asks for confirmation The channels remain paired until the checkbox is unchecked Figure 20 The link channels window is under Tools gt Options gt Link channels Channels can be linked to decrease the time spend in setting the right filters for different channels 20 DLCP User manual R3 DLCP 4 6 5 DLCP options window 3 Options Settings Link Channels DLCP options Remote Selection Dutput Routing Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel C Remote n M s 5 Left Left e Left Left Left C Hypes Remote B E Right Right Right Right f Right C L R Mid L R Mid L R Mid L R Mid C L R Mid L R Mid Power up Selection C L R Side L R Side L R Side L R Side L R Side L R Side n Figure 21 The DLCP options window is under Tools gt Options gt DLCP options Two different IR remote codes can be used to control the DLCP control this can be switched in the remote selection This information will be send to the DLCP control when present The DLCP can automaticallu turn on when power is applied without waiting for the DLCP control if this is desirable See the Power up selection function You can change the source for each output on the right side Output Routing for example select Left to get the left input signal of the
27. opriate operation is excluded from the warranty 6 Revision History The following table shows the revision history for this document Revision PCB Version Description Date _ RO DLCP V1 Initial Draft 23 11 2010 DLCP V3 Updated because of new hardware version 16 01 2013 DLCP V4 Typos changed DLCP V4 Tupos changed control and inputboard dimensions added 11 12 2014 30
28. optional DLCP input board is bought This input board can be connected to the DLCP with only 2 flat cables You can increase the number of analogue inputs to 4 balanced stereo analogue inputs It has four digital inputs USB audio AES XLR RJ45 S PDIF and Optical in It has two digital outputs AES XLR RJ45 and S PDIF It s possible to connect two DLCP s with only one input board J5 J5B be used to connect the third DLCP or the second DLCP if it s not in the same case The control and digital outputs of the first DLCP connected to J2 J3 and analogue inputs are linked trough the inputs of the second DLCP connected to J2B J3B Three or more DLCP modules can be connected together with a straight through 8 wire cat5 cable with RJ45 connectors The bus is specified and tested for cables up to 10 meter Note 1 Switchable on PCB See Settings for information about the right positioning of the switch es IH HH HH E Ei rH HHHE HAHH purit 2 5 1 1 Connections y Joes 5 EOD 7 122157 ie sala alas n om AS ell 118 7 12 413 14 J15 416 Tert me nmm J31 Mounting block SS O O S1 USB switch switch between DLCP 1 J3 DLCP2 J3B __ 1 Z 1 1 1 26 USB connector ____ O J4 ____ Control in If this connector is used dontuseJAB S J4B_ Controlin Ifthis connector is used don t use 34 __ O 25 ___
29. rmware Current mode serial I F USB audio Dimensions only 110mm x 110mm x 30mm Low weight 140g 3 Features Compact design Personal Computer controlled Input sample rates up to 192kHz Analogue and digital inputs Digital balanced audio loop through Low jitter discrete clock oscillator Balanced audio in and out Six channel active filtering Fully user configurable filters Firmware updateable bu USB Separate Clock and Data Paths Six user configurable analogue balanced outputs High Level outputs permit direct interface with NCA00 buffered UcD ST and HG power amplifiers Analogue input gain trim 9 local DAC regulators IIR filtering HEN HEE gt User manual R3 DLCP 96kHz sampling rate Can be used as a digital pre amplifier Stand bu mode On board Molex Microfit output connectors Connector for external Led Optional control board with IR receiver for IR control LCD display and buttons Optional input board to increase the number of analogue stereo inputs to 4 Link communication only with two or more modules and in combination with a controller 1 4 Applications High end consumer audio Digital pre amplifier Active speakers up to six way Three wau stereo active sustem PA Systems Studio Monitors With 2 modules it is also possible to set up an Active 12 channel system Active 6 way stereo system Setups are further explained in the Product overview chapter User manual R3 DLCP
30. symmetric Shelf Boost Cut Centre Frequency 65 8 mery Gam dB 750 z Common Settings Delay us 0 0 23 Mute channel Delay mm pars Gain dB 42 23 Show Filters Show Filter Show Filtered Driver ShowBiquad V Show Sum O Factor 7 15 iquad Section js E Di 5 Low Shelf High Shelf 74 One ooh b amp DLCP Firmware version 1 0 Figure 18 18 User manual R3 DLCP 4 6 1 Graph Area The magnitude tab shows the imported driver responses filters individual biquads individual fil tered driver responses and the sum Function 1 1 0 O Light blue thick Response of filter selected channel only Orange thick Response of selected biquad Black thick Having all of these on at the same time quicklu produces an intractable mess so these graphs can be separatelu 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 re sponse and are used to demarcate the anechoic portion 4 6 2 Filter Definition Area The channel tabs are functionally identical The top left frame is used to import response files The select button opens a file The show checkbox turns displau of the measured graph on or off The Common Settings box controls global gain for each channel delay and the visibility of plots
31. t connected You usas Er can also manually make a connection bu the connect button C AES on the bottom right of the control panel Group Volume Mute 4 You can adapt the settings of the module real time through USB On the left side in the control panel you will see the Force input and active input groups This shows you the settings of the audio inputs and lets you control these inputs Audio can be provided analogue and digital The selection of any of these inputs can be done auto maticallu with the auto detect option The first digital input that contains anu valid audio is select ed and becomes the new input source When the module selects one of the inputs this is shown bu the active input lights Figure 15 The last thing that can be controlled in this window is volume mute This can be done by setting the scrollbar to a desired position or by typing the value in the volume field the value is send when pressed enter of the configurations made here will be redirected from the current module to any other connected DLCP s when a control board is present So there is no need to connect the slave module to the pc to change these settings 4 5 1 Input options pu Under Tools Input options you can change the number of wc oh sRasachreaanth analogue inputs when you ve made your own input i board or removed some from the Hupex Input board 2 bon When you use the default input board fro
32. t header contains all audio outputs from J10 J15 22 Analogue Digital audio in and digital output header I O connector USB Relay Control dM DLCP SMPS power supply connector Do not use when Hypex SMPS module auxiliary output is connected with J16 Gain adjust header analogue left input Gain adjust header analogue left input o Z oS o 28 Gain adjust header analogue rightinput Z o Z SS O J17 Standby supply connector gt gt S J10 jAndogueaudiooutputchl __ SSS J311 jAndogueaudiooutputcha ___ J12 __ Analogue audio outputch3 __ O 213 Andogueaudiooutputchh SSS O J14 Analogue audio outputch5 __ SSS O 215 __ audio outputch6 gt SSS O 216 Power Supply connector Hypex SMPS Do not use when is connected to another supply 27 UED connector SS J6 Microcontroller amp DSP programmer connector not used by user JP5 Jumpersforprogramming or normal operation not used byuser o User manual R3 DLCP S PDIF Optical AES3 in S PDIF out AES3 out o n 3 S sh D Analogue in 1 Analogue in 2 User 1 0 USB Power Supply Figure 2 2 1 Description The DLCP is a complete hardware firmware platform for digitally filtered and corrected active mul tiway loudspeakers Digital response correction allows significant extra degrees of freedom in the acoustic design of a loudspeaker Driver paramet
33. ter with a high 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 cabi net resonances that emanate through the same diaphragm mau be corrected ruthlessly provided the measurement has sufficient resolution to pin them down As a rule of thumb sharp dips are diffraction artefacts while sharp peaks are caused bu the drivers themselves Exceptions are room resonances if the response is not correctly truncated and diffrac tions on repetitive patterns The second step is designing the actual crossover filters the usual strategies work Delauing higher frequency drivers with respect to lower frequencu ones is a powerful alternative to using asymmetric slopes and yields substantially improved coherence through the crossover region 4 6 8 Download Under download the user can press load DSP to download the designed filters into the module 4 6 9 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 Alt 23 User manual R3 DLCP hough you can see the filter name that s present in the DLCP this can be readout under Help gt about h Firmware update 4 7 1 DLCP Everu module has the abilitu to update its firmwar
34. tion of the test mule is quite smooth apart from one internal standing wave 4 6 7 Designing filters Sectionisntusd LPF1 Cut off frequency always 3dB LPF2 Cut off frequency asymptotically Second order low pass A of 0 71 cor Q responds to Butterworth 0 5 corre sponds to LR2 Two identical sections with a of 0 71 form an filter Cut off frequency asymptotically Second order high pass A Q of 0 71 cor Q responds to Butterworth 0 5 corre sponds to LR2 Two identical sections with a of 0 71 form an filter Shelf1 Centre Frequency halfway point First order shelf Useful for baffle step Gain correction Direction Centre Frequency halfway point Second order shelf Useful for correcting Shelf Gain internal cabinet resonances and for the midband combo of most mid Direction woofer speakers Equalizing the bottom end of closed box Zero frequency and woofers with large magnets Boost Cut Centre frequency Dip peak filter For peaks Q is defined Q by the poles For dips is defined by gain the zeros Thus the same filter with op posite gains will cancel The first step is equalizing the magnitude responses of the drivers flat over their entire useable fre quency 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 fil
35. uts for whichever digital signal is present The input source is automatically switched to digital when present using the priority de scribed below If the digital audio source is removed the input will be automatically switched back the last chosen analogue input Auto detect input priority high to low 1 AES 2 SPDIF 3 USB_audio 4 Optical 2 5 3 Digital output The DLCP contains two separate digital outputs AES EBU and S PDIF The selected digital input is directly send to both digital outputs Without filtering 2 4 4 DSP The DSP filtering can be changed by Hypex Filter Design HFD software The digital outputs from the DSP are fed to the DACs The DAC chip receives data from the DSP and clock either from the crustal oscillator or from the digital input section The digital signal is then converted to analogue by the DAC The post filter is executed twice providing a balanced load to the DAC and delivering a high output level to the power amplifier 2 4 5 Microcontroller A microcontroller controls the DSP and other ICs and I O s on the PCB communicates with the con trol board PC and or other DLCP s that may be attached When the module is powered on it will au tomatically start up with the last settings All settings like volume and source selection are stored after a change is made User manual R3 DLCP 2 5 Add ons 2 5 1 DLCP Input board Figure 3 The DLCP can be used as a digital pre amplifier when the
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