MIDIDSP C-DSP 8X12, User Manual

Page 1: ...miniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 1 C DSP 8X12 8 IN 12 OUT ADVANCED IN CAR AUDIO PROCESSOR User Manual...

Page 2: ...r notice 2 Revision history Revision Description Date V0 1 Preliminary version 15 February 2017 V0 2 Corrected specifications 16 February 2017 V0 3 REW at 192 kHz info 20 February 2017 V0 4 Revised pr...

Page 3: ...Low level inputs 13 4 1 2 High level inputs 14 4 2 Digital input 15 4 3 Analog outputs 15 4 4 DC power 16 4 4 1 Powered on power position 1 16 4 4 2 Remote trigger position 2 16 4 5 Wired remote 17 4...

Page 4: ...programming 34 5 7 3 Biquad design software 36 5 8 Working with configurations 37 5 8 1 Online and offline mode 37 5 8 2 Selecting a configuration 37 5 8 3 Saving and loading configurations 38 5 8 4 L...

Page 5: ...r 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 8 or hi...

Page 6: ...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...

Page 7: ...ing high shelf low shelf all pass on every input and output channel Advanced biquad programming for an unlimited range of filters and crossover types An advanced matrix mixer for routing and mixing of...

Page 8: ...t tell it how to process the audio signal Currently the C DSP 8x12 supports a single plugin see below Other platforms miniDSP makes many other boxed and kit hardware units with analog stereo digital a...

Page 9: ...p down the Restore menu and select Upgrade DSP program This ensures that the DSP processor in the C DSP 8x12 is running the latest software that matches your installed plugin 4 Familiarize yourself wi...

Page 10: ...isplay in the plugin while turning the knob on the wired remote counter clockwise and start playing music or a pink noise test signal 3 Gradually increase the volume until you hear audio quietly comin...

Page 11: ...ing C DSP 8x12 plugin Unzip the downloaded file on Windows right click and select Extract All on Mac double click 3 1 WINDOWS The miniDSP software requires that other frameworks are installed for it t...

Page 12: ...lick and open as described below We recommend that you accept the default installation settings 3 To run the plugin locate C DSP 8x12 app in the Applications miniDSP folder and double click on it To m...

Page 13: ...y 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 2 or 4 VR...

Page 14: ...the terminal block The high level inputs have an input impedance of 68 and are designed for connection to power amplifier outputs The inputs are fully differential therefore Amplifiers with bridged o...

Page 15: ...e left and right channels of the selected digital input are mixed with the analog inputs as specified by the cross points on the Routing tab page 23 Note the digital inputs accept only a stereo PCM di...

Page 16: ...ally power is provided from the main vehicle supply always on 4 4 2 Remote trigger position 2 To reduce battery drain the remote trigger option should be used To enable remote trigger set the REMOTE M...

Page 17: ...ied RJ11 phone cable The plugs on each end simply plug into the base of the remote and into the rear panel of the C DSP 8x12 The wired remote also contains the receiver for infrared remote control 4 6...

Page 18: ...ugin can remain connected during use for real time live control of all audio processing This screenshot shows the C DSP 8x12 plugin with the key areas highlighted During initial configuration of the p...

Page 19: ...ime 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 a...

Page 20: ...l subwoofer volume but can also be used in other ways for example to control rear channel speaker level The current values for master and subwoofer volume are displayed in the plugin while connected 5...

Page 21: ...digital input appears above input channel strips 7 and 8 Click on the current input name to drop down a selector menu from which you can select the input You can also select the digital input with an...

Page 22: ...me 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 by typing the desired gain into the Curre...

Page 23: ...the default routing Input1 is routed to Output1 Input2 to Output2 and so on 5 5 1 Mixing channels If more than one input channel is routed to the same output channel the input channels are mixed summ...

Page 24: ...fer channel This example can easily be expanded by adding additional subwoofer output channels Example 2 active speakers The C DSP 8x12 can create complex active speaker systems Each audio channel is...

Page 25: ...below press the Enter key then click the close button Each cross point can also have the signal inverted by clicking on the Invert button When the mixed signal is inverted the button will be displaye...

Page 26: ...s and specifications subject to change without prior notice 26 5 6 OUTPUT TABS There are two output tabs one for channels 1 to 6 and one for channels 7 to 12 Each displays a row of output channel cont...

Page 27: ...evel 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 Adjustment sl...

Page 28: ...aph showing the combined 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 h...

Page 29: ...HELF 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 filter t...

Page 30: ...equencies 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 frequency cont...

Page 31: ...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 Linkwitz Rile...

Page 32: ...s 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...

Page 33: ...stance is shown in cm when the cursor is hovered over the time delay box The maximum time delay of 25 ms corresponds to a distance of approximately 8 6 meters about 28 feet The delay can also be displ...

Page 34: ...ad 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 this can...

Page 35: ...996920046761057 a1 1 9950521500467384 a2 0 9951112472449212 biquad2 b0 0 999640139948623 b1 1 9981670485581222 b2 0 9985489719847982 a1 1 9981670485581222 a2 0 9981891119334211 biquad3 biquad4 biquad5...

Page 36: ...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 roomeqw...

Page 37: ...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 miniD...

Page 38: ...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 be...

Page 39: ...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...

Page 40: ...d select Remote Power Settings On the screen enter the desired value for each time delay parameter and press the Enter key When finished click the close X icon at the top right and the settings will b...

Page 41: ...ess 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 wh...

Page 42: ...the remote control If the code is accepted the status will change to show a tick This screenshot shows the IR learning screen To unlearn a command press the Learn button and wait for the plugin to ti...

Page 43: ...A connectors 6 0V RMS full scale output Output impedance 560 Audio resolution 24 bit input and output 192 kHz internal sample rate Audio processing 400 MHz 32 bit Floating Point SHARC Digital Signal P...

Page 44: ...er Referring to Figure 3 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 use f...

Page 45: ...io or low audio on outputs a Check the cabling from the processor to your amplifiers b Check that your amplifiers are turned on and that any volume controls are turned up c Check that the input meters...

Page 46: ...the latest version of the plugin b Check that your processor has the latest firmware installed About menu 8 Cannot reload a configuration a Confirm the file format of your file xml b Confirm the vers...