miniDSP C-DSP 8X12 DL User Manual Download Page 2

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PRELIMINARY

miniDSP Ltd, Hong Kong /

www.minidsp.com

/ Features and specifications subject to change without prior notice

Revision history

Revision

Description

Date

V0.1

Preliminary version for Dirac Live

3 April 2019

V0.4

Preliminary public release

20 May 2019

Summary of Contents for C-DSP 8X12 DL

Page 1: ...P Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 1 C DSP 8X12 DL 8 IN 12 OUT ADVANCED IN CAR AUDIO PROCESSOR WITH DIRAC LIVE ACOUSTIC CORRECTION PRELI...

Page 2: ...Kong www minidsp com Features and specifications subject to change without prior notice 2 Revision history Revision Description Date V0 1 Preliminary version for Dirac Live 3 April 2019 V0 4 Prelimina...

Page 3: ...7 3 2 Digital input 18 3 3 Analog outputs 18 3 4 DC power 19 3 4 1 Powered on power position 1 19 3 4 2 Remote trigger position 2 19 3 5 Wired remote 20 3 6 USB 20 4 Plugin Overview 21 4 1 User interf...

Page 4: ...tab 42 5 6 Running the measurements 43 5 6 1 Select listening environment 43 5 6 2 About measurement locations 43 5 6 3 Execute a measurement 44 5 6 4 If you receive an error 45 5 6 5 Viewing and red...

Page 5: ...2 3 Biquad design software 66 8 3 Working with configurations 67 8 3 1 Online and offline mode 67 8 3 2 Selecting a configuration 67 8 3 3 Saving and loading configurations 68 8 3 4 Loading configura...

Page 6: ...iDSP 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 carefull...

Page 7: ...imits 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 int...

Page 8: ...on the computer we have included hyperlinked cross references throughout the manual In addition a table of contents is embedded in the PDF file Displaying this table of contents will make navigation m...

Page 9: ...mplete active multichannel surround system Low noise analog circuitry driven by a 32 bit AKM convertor ensures pristine audio quality in any vehicle environment Four complete processing configurations...

Page 10: ...8 channels of Dirac Live correction with flexible assignment to output channels Stereo digital input source switchable to any combination of outputs Rear channel synthesis for stereo sources Multiple...

Page 11: ...le listening area not just at a single point The user has full control over the target response Measurements are taken with a calibrated acoustic measurement microphone the miniDSP UMIK 1 In addition...

Page 12: ...control of each output channel in order to implement for example subwoofer crossover active speaker crossovers or rear center synthesis See Section 4 Plugin Overview 3 Run a series of acoustic measure...

Page 13: ...dropdown menu at the top right of the website page Navigate to the C DSP plug ins section and download the zip file under the heading C DSP 8x12 DL plugin Unzip the downloaded file on Windows right c...

Page 14: ...d then to the Windows folder 2 Double click on the C_DSP_8x12_DL exe installer program to run it We recommend that you accept the default installation settings Dirac Live Calibration Tool DLCT install...

Page 15: ...click and open as described above We recommend that you accept the default installation settings 3 To run the plugin locate C DSP 8x12 DL app in the Applications miniDSP folder and double click on it...

Page 16: ...e directly to the RCA jacks on the front panel Be sure to take careful note of the channel numbering shown in this diagram and on the front panel These inputs accept a maximum input voltage of either...

Page 17: ...al block The high level inputs have an input impedance of 68 and are designed for connection to the speaker outputs of a head unit The inputs are fully differential therefore Amplifiers with bridged o...

Page 18: ...tween sources can be done from within the plugin or with an infrared remote control Note the digital inputs accept only a stereo PCM digital signal They do not accept encoded or multichannel digital a...

Page 19: ...1 Typically power is provided from the main vehicle supply always on 3 4 2 Remote trigger position 2 To reduce battery drain the remote trigger option should be used To enable remote trigger set the...

Page 20: ...s on each end simply plug into the base of the remote and into the rear panel of the C DSP 8x12 DL The wired remote also contains the receiver for infrared remote control 3 6 USB To configure the proc...

Page 21: ...processing 4 1 USER INTERFACE This screenshot shows the C DSP 8x12 DL plugin with the key areas highlighted During initial configuration of the processor it is strongly recommended that any connected...

Page 22: ...onfiguration 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...

Page 23: ...red onboard The currently selected preset is indicated by a dark background To switch to a different preset just click on the desired button 4 3 2 Tab selection For the selected configuration this row...

Page 24: ...channel speaker level Subwoofer volume can be varied from 72 to 12 dB To set which channels are controlled in subwoofer volume mode see page 55 The current values for master and subwoofer volume are...

Page 25: ...r are processed via crossovers parametric EQ and gain and delay The signal processing is configured by two different programs DLCT for Dirac Live and the C DSP 8x12 DL plugin for the processing on the...

Page 26: ...8x12 DL provides superb control over subwoofer integration including fine grain frequency settings accurate time delay and steep crossover slopes The level meters at the left display the current inpu...

Page 27: ...in yellow The cross point is turned on and off by clicking on it Any number of input channels can be mixed to each output channel Note To rename an input channel click on its label and type in a new n...

Page 28: ...d only Here is an example The Input and Output columns display the current signal level at the inputs and outputs of the Dirac Live processing block while Gain and Delay display the gains and delays c...

Page 29: ...ng the top This is the default Mixer tab When a cross point is turned on the Dirac Live signal at the left is routed to the output channel at the top In the default routing Dirac1 is routed to Output1...

Page 30: ...12 Each displays a row of six output channel control strips All output channels are identical This screenshot shows channels 1 to 6 Each output channel has a complete strip of controls with customizab...

Page 31: ...d all output channels are taken from the Dirac Live outputs The next diagram illustrates the signal flow and processing in dark blue overlaid on the signal flow diagram from Figure 5 In this case the...

Page 32: ...sent to the subwoofer channel for Dirac Live correction To use this configuration do a Dirac Live calibration first on the speaker and subwoofer channels Then set up the Inputs Bass Mgt tab with the...

Page 33: ...fects of all subwoofers playing at the same time If you use the Routing tab for splitting the subwoofer signal and use multiple Dirac Live channels then when they are all combined the result may not b...

Page 34: ...e channel The Mixer tab routes each channel from Dirac Live to three output channels It looks like this You will need to use REW to measure each driver correct it and implement crossover filters The p...

Page 35: ...hown in the routing matrix below 2 Add a delay of up to 20 ms to the rear channel outputs experiment to see what sounds best to you 3 Add high pass and low pass filters to the rear channels to limit b...

Page 36: ...ion requires a total of nine measurements with the microphone located in different positions Typically the microphone is pointed vertically that is at the roof The first measurement must be taken at t...

Page 37: ...type B cable from the C DSP 8x12 DL to a USB port on the computer Connect a USB cable type A to mini type B from the UMIK 1 to a USB port on the computer You will need to arrange a method of holding...

Page 38: ...it does not matter which one is selected 5 3 3 Check subwoofer volume Check that the subwoofer volume is set to zero Remember that this volume is relative to the master volume Zero is typically the be...

Page 39: ...rent step of the calibration process These are generally worked through in order from top to bottom This section covers the first four tabs the final two are covered in Dirac Live Filter Design Load a...

Page 40: ...drive signal from the left and right input channels o For a straight through multichannel configuration use Custom System and set Number of Channels to the number of input channels For example Use 4 f...

Page 41: ...rding channel Select 1 from the drop down menu Microphone calibration file To download the unique calibration files for your microphone go to the UMIK 1 page and enter your microphone s serial number...

Page 42: ...ed to that channel This is needed because of the limited frequency response of the subwoofer To set levels we recommend following this procedure 1 Check that the Output volume slider is set at the def...

Page 43: ...to be done is highlighted in yellow and has a red arrow marker pointing to it A drop down menu underneath selects three different views which should be used to help you place the microphone in a suit...

Page 44: ...listening area and that the microphone is moved vertically as well as horizontally 5 6 3 Execute a measurement With the microphone in place at the central location and pointed vertically towards the r...

Page 45: ...is shown in red on the signal graph In either case go back to the Output Levels tab and adjust Output volume Input gain or the Channel volume slider for the channel that caused the problem Then re run...

Page 46: ...lots are shown in light blue Avg spectrum after The predicted average magnitude response after correction These plots are shown in green and can be viewed only after filters have been generated with t...

Page 47: ...area To display the impulse response instead of the magnitude response click on the Impulse button at the top left of the display All nine individual impulse responses can be shown as well as the ave...

Page 48: ...roup Linking channels makes it easier to experiment with target curves Initially you may wish to link all speaker channels together Once you have target curves that sound right to you in your installa...

Page 49: ...target curves on page 51 6 2 2 Editing the target curve You can edit the target curve to produce any desired magnitude response This is done with the use of anchor points shown as orange dots on the...

Page 50: ...you initially don t achieve a satisfactory result please ensure that you have spread your measurements over a sufficiently large area and with sufficient variation in height The following guidelines w...

Page 51: ...nse This can occur where for example the direct acoustic path to the speaker is obstructed In such a case adjusting the magnitude response to follow the dip may produce the best sound Unlinking left a...

Page 52: ...on the speed of your computer When the algorithm completes the predicted average magnitude response will be shown in green The predicted impulse response can be viewed by clicking on the Impulse butt...

Page 53: ...on its name oriented vertically drag it from the slot and drop it on the trashcan icon at the top right You must load the filters into the same slot as the preset selected when running the Dirac Live...

Page 54: ...one of the four buttons The LED of the selected preset will flash several times When it stays lit the selected preset in now in operation Note The preset cannot be changed with the wired remote while...

Page 55: ...ROL Any number of channels can be selected for subwoofer volume control mode From within the C DSP 8x12 DL plugin drop down the Display menu and select Subwoofer Channels Selection The selection dialo...

Page 56: ...e always active 1 2 3 4 Switches to the selected preset Note that it takes a few seconds for the preset selection to complete while the processor loads the new filters from its flash memory into the D...

Page 57: ...the learning process start the C DSP 8x12 DL plugin and click on the Connect button Once connected drop down the IR Remote menu and select IR learning Click on the Learn button for an operation and t...

Page 58: ...lays 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 Adjustment slider or b...

Page 59: ...response of all enabled 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...

Page 60: ...HIGH_SHELF and LOW_SHELF filter types this is the frequency at which the gain is half of the set value For the ALL_PASS filter type this is the center frequency of the phase shift Gain For the PEAK fi...

Page 61: ...ve 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 pass filters Crossover filters can also be used to limit low frequ...

Page 62: ...ilter 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 and 48 dB octave Linkwit...

Page 63: ...is distance is shown in cm when the cursor is hovered over the time delay box The maximum time delay of 20 ms corresponds to a distance of approximately 6 9 meters about 22 5 feet The delay can also b...

Page 64: ...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 A single biquad like th...

Page 65: ...91200483864 b1 1 9950521500467384 b2 0 996920046761057 a1 1 9950521500467384 a2 0 9951112472449212 biquad2 b0 0 999640139948623 b1 1 9981670485581222 biquad3 biquad4 biquad10 b0 1 0010192374642126 b1...

Page 66: ...metric 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 roome...

Page 67: ...ly The next time the plugin is synchronized to the processor the parameters will be downloaded to the processor provided the Synchronize Config button is selected The configuration contained in the mi...

Page 68: ...ct Load configuration to current slot 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...

Page 69: ...resets 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 configurati...

Page 70: ...bit Floating Point SHARC Digital Signal Processor ADSP21489 Filtering capabilities Dirac Live mixed phase filtering calibration with Dirac Live Calibration Tool User programmable IIR filters high pas...

Page 71: ...op cover Referring to Figure 7 below move both switches for each input to the desired setting The switches are very small so you will need a small device like the end of a paperclip to move them Don t...

Page 72: ...ettings The window shows a timing diagram with two editable text boxes that can be used to change the timing REM out delay This value controls the delay from REMOTE IN going high to REMOTE OUT going h...

Page 73: ...ed input can be measured REW generates a test signal that plays through the system and each speaker in turn This program uses a swept sine wave technique which is a signal that starts at low frequenci...

Page 74: ...ck the cabling from your source b Check that your source is playing audio and that it is not muted or have volume control turned down c Check that the plugin is synchronized with the hardware unit 5 L...

Page 75: ...is not muted and doesn t have gain trim controls set to zero d Quit DLCT open the C DSP 8x12 DL plugin and click Connect Connect an analog source to the inputs and confirm that signal levels are seen...

Page 76: ...ough the Troubleshooting checklists starting on the previous page 2 Check the forums on miniDSP com to see if your issue has already been raised and a solution provided 3 Contact miniDSP via the suppo...

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