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Summary of Contents for miniDSP C-DSP 8X12 DL
- Page 1 PRELIMINARY C-DSP 8 12 DL DVANCED UDIO ROCESSOR ® WITH IRAC ACOUSTIC CORRECTION PRELIMINARY User Manual miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
- Page 2 PRELIMINARY Revision history Revision Description Date V0.1 Preliminary version for Dirac Live 3 April 2019 V0.4 Preliminary public release 20 May 2019 miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 3: Table Of Contents
Dirac Live tab ............................28 Mixer tab ..............................29 Output tabs .............................. 30 4.10 Application guide ............................. 31 4.10.1 Straight through ..........................31 4.10.2 Bass management ........................... 32 miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... - Page 4 Status indicators ............................54 Operation of the wired remote ....................... 54 Channel selection for subwoofer volume control ................... 55 Using the miniDSP infrared remote ......................56 Learning third-party remote codes ......................57 Plugin Reference ............................ 58 Output channel processing ........................58 8.1.1...
- Page 5 Input sensitivity setting ........................... 71 Remote trigger timing ..........................72 Acoustic measurement setup for REW ....................73 Troubleshooting ............................74 9.5.1 C-DSP 8x12 DL plugin ........................74 9.5.2 DLCT ..............................75 Firmware upgrade ........................... 76 Obtaining support ............................ 76 miniDSP Ltd, Hong Kong / www.minidsp.com...
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Page 6: Important Information
Please read the following information before use. In case of any questions, please contact miniDSP via the support portal at minidsp.desk.com. System Requirements To configure the miniDSP audio processor, you will require a Windows PC or Apple Mac OS X computer with the following minimum specification: Windows •... - Page 7 Warranty Terms miniDSP Ltd warrants this product to be free from defects in materials and workmanship for a period of one year from the invoice date. Our warranty does not cover failure of the product due to incorrect connection or installation, improper or undocumented use, unauthorized servicing, modification or alteration of the unit in any way, or any usage outside of that recommended in this manual.
- Page 8 • In Preview on the Mac, click on the View menu and select Table of Contents. The table of contents will appear on the left and can be unfolded at each level by clicking on the triangle icons. miniDSP Ltd, Hong Kong / www.minidsp.com...
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Page 9: Product Overview
YPICAL USAGE The C-DSP 8x12 DL typically connects to a head unit with up to six outputs. Figure 1 illustrates a straightforward installation, with four channels supplied by the head unit and four speakers being driven by a power amplifier. - Page 10 Multiple onboard configurations for different situations (with/without passengers, competition etc.). Figure 2 illustrates a more complex installation that uses more of the features of the C-DSP 8x12 DL. While designed specifically for car use, the advanced features and high performance of the C-DSP 8x12 DL also make its use feasible in other situations where complex multichannel processing is needed, such as homes, recording studios, churches and halls, and exhibitions.
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Page 11: Dirac Live
The C-DSP 8x12 DL provides, in addition to Dirac Live, a full suite of miniDSP’s audio processing functions on each channel. Combined with two flexible matrix mixers for audio routing, this enables advanced applications such as in-vehicle active crossovers to be corrected by Dirac Live, all in a compact 12V-powered unit. -
Page 12: Overview Of Configuration Steps
1.3 O VERVIEW OF CONFIGURATION STEPS The steps for configuring the C-DSP 8x12 DL with Dirac Live® are summarized as follows: 1. Connect the C-DSP 8X12 DL audio processor into your system and install software. See Section 2, Hardware Connectivity and Section 3, Software Installation. -
Page 13: Software Installation
The User Downloads link is visible from the 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-click and select “Extract All...”; on Mac, double-click. ). The unzipped... -
Page 14: Software Installation - Windows
INDOWS Possible Windows installation issues The miniDSP software requires that a number of other frameworks be installed for it to work. For Windows 7 and later, these packages should be installed automatically. For earlier versions of Windows, please download and install the following frameworks before attempting to install any miniDSP software. You can also manually install these if you receive an error message that required software is missing. -
Page 15: Software Installation - Macos / Os X
We recommend that you accept the default installation settings. To run the plugin, locate C-DSP-8x12-DL.app in the Applications -> miniDSP folder and double-click on it. To make it easier to run in future, right-click on its dock icon and select Options -> Keep in Dock. -
Page 16: Hardware Connectivity
PRELIMINARY ARDWARE ONNECTIVITY Connections to the C-DSP 8x12 DL are made on the front and rear panels. 3.1 A NALOG INPUTS 3.1.1 Low-level inputs Low-level analog connections are made 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. -
Page 17: High-Level Inputs
(see page 71). The 8 V RMS setting corresponds to a maximum amplifier power of 16 Watts into 4 ohms. The 12 V RMS setting corresponds to a maximum amplifier power of 36 Watts into 4 ohms. miniDSP Ltd, Hong Kong / www.minidsp.com... -
Page 18: Digital Input
Be sure to take careful note of the channel numbering shown in this diagram and on the rear panel. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 19: Dc Power
3.4.1 Powered on power (position 1) To power on the C-DSP 8x12 DL whenever 12 V DC is applied to the DC IN terminals, set the REMOTE MODE switch to position 1. Typically, power is provided from the main vehicle supply (always on). -
Page 20: Wired Remote
Note that USB is used only for configuration — audio data cannot be streamed to the processor over USB. Configurations can also be loaded from a micro SD card – see page 68. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 21: Plugin Overview
PRELIMINARY LUGIN VERVIEW The overall power of the C-DSP 8x12 DL comes not only from its comprehensive I/O but it’s merge of Dirac Live processing with miniDSP’s powerful audio processing. 4.1 U SER 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 amplification be muted or powered off. -
Page 22: Synchronizing With The Processor
Note that the configuration data currently stored in the processor will be deleted. Cancel This option cancels the attempt to connect to the processor. The plugin will remain in offline mode. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 23: Global Controls
4.3.3 Digital input selection When the plugin is connected to the C-DSP 8x12 DL, the currently select digital input appears on the Inputs & Bass Mgt tab, just above the level meters for channels 7 and 8. Click on it to pop up the selection menu and select the desired input. -
Page 24: Ip Address And Auto
Reserved for future use. 4.3.6 Subwoofer and Master volume The C-DSP 8x12 DL has two modes of volume control operation: Master volume mode In this mode, the wired remote and infrared remote control the master volume i.e. all output channels. -
Page 25: Signal Flow
For the sections configured by the C-DSP 8x12 plugin, acoustic measurement with a separate program like Room EQ Wizard (REW) will give the best results. If you wish to use the advanced features of the C-DSP 8x12 DL and are not familiar with acoustic measurement software, see Acoustic Measurement Primer on page 73. -
Page 26: Inputs & Bass Mgt Tab
& B NPUTS GT TAB This tab is used to generate a subwoofer feed from the speaker channels. The C-DSP 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 input signal level. This can be very useful for debugging and trouble-shooting. -
Page 27: Routing Tab
“Inverted”. The lettering of the cross- point will be highlighted in green. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 28: Dirac Live Tab
IVE TAB This tab displays the gains and delays of the Dirac Live filters loaded into the C-DSP 8x12 DL. (The plugin must be online to display them.) These gains and delays are calculated by DLCT during its Optimize phase and cannot be changed by the user –... -
Page 29: Mixer Tab
It is also used when directing the subwoofer signal to multiple subwoofer output channels. As with the Routing tab, each cross-point has adjustable level and an Invert option. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 30: Output Tabs
(see the Plugin Reference starting on page 58 for full details). For example, the crossover screen opened by clicking on the Xover button looks like this: miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 31: Application Guide
Once you have learned how Dirac Live calibration works, then attempt a more advanced configuration using the plugin. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 32: Bass Management
You may need to adjust the filter type, frequency or slope to get the best integration. After you have set up the plugin, save your configuration to a file. miniDSP Ltd, Hong Kong / www.minidsp.com... -
Page 33: Dual Subwoofers
See this app note for some ideas on how to tune with multiple subs (it was written for a room, but Methods B and C will apply in a vehicle): • Tuning multiple subwoofers with miniDSP miniDSP Ltd, Hong Kong / www.minidsp.com... -
Page 34: Active Crossover
PRELIMINARY 4.10.4 Active crossover The C-DSP 8x12 DL can implement active crossovers of any complexity up to the number of available output channels. An example signal flow is illustrated overlaid on the signal flow diagram from Figure 5, assuming a stereo input with three-way speakers: Each speaker has a single Dirac Live channel. -
Page 35: Rear Channel Synthesis
Zero the delays on the rear output channels. Run the Dirac Live calibration. Set the delay and filters on the rear output channels again. Experiment to find out what sounds best. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 36: Acoustic Measurement For Dirac Live
COUSTIC EASUREMENT FOR IRAC The Dirac Live Calibration Tool For miniDSP uses a set of measurements made in your vehicle to gather all the acoustical information about your speakers acoustical environment that it needs to calculate the correction filters. 5.1 O... -
Page 37: Connections
The figure below shows a typical connection diagram for performing acoustic measurement for Dirac Live calibration. No changes to the audio connections are needed. Simply: • Connect the supplied USB (type A to type B) cable from the C-DSP 8x12 DL to a USB port on the computer. •... -
Page 38: Some Notes And Cautions Before You Begin
Quit the C-DSP 8x12 DL plugin before starting Dirac Live Calibration Tool for miniDSP (DLCT). Be sure to quit the C-DSP 8x12 DL plugin. Running DLCT and the plugin at the same time can result in communication conflicts and odd behavior. -
Page 39: Configuring For Measurement
5.5 C ONFIGURING FOR MEASUREMENT The Dirac Live Calibration Tool for miniDSP (DLCT) user interface is shown in this annotated screenshot. Logo and status progress bar This area shows a progress bar with current status when the program is performing calculations. If the program seems unresponsive at any time, check the status here. -
Page 40: Sound System Tab
For a 5.1 source that applies the “10 dB LFE gain,” use 5.1 Speaker System. Test signal playback device Preset to C-DSP 8x12 DL. This will ensure that test signals are sent into your audio system via the C-DSP 8x12 DL processor. -
Page 41: Mic Config Tab
Note: depending on your platform, the display on this screen and dropdown may vary slightly, as shown at right. A miniDSP UMIK-1 is required. You cannot use a different microphone with the miniDSP version of Dirac Live Calibration Tool. Recording channel Select 1 from the drop-down menu. -
Page 42: Output & Levels Tab
Channel volume sliders to adjust the relative volume of the channels. (Some readjustment of Input gain and Output volume may also be needed.) When done, click the Proceed button. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 43: Running The Measurements
For example, if using the Chair listening environment, spread the microphone positions over a circle with a diameter of a meter (three feet). Vary the height of the microphone up and down by 30 cm (one foot) from the miniDSP Ltd, Hong Kong / www.minidsp.com... -
Page 44: Execute A Measurement
With the microphone in place at the central location and pointed vertically (towards the roof), click on the Start button. The C-DSP 8x12 DL will generate a test signal, audible as a frequency sweep through the front left speaker, then the right front, and so on through all channels. Finally, the frequency sweep plays through the left speaker again. -
Page 45: If You Receive An Error
Once all nine measurements have been successfully completed, all locations will be marked in green. Click the Proceed button to go the Filters screen. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 46: Dirac Live Filter Design
All of the predicted magnitude responses after correction. These plots are shown in dark green and can be viewed only after filters have been generated with the Optimize button. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... - Page 47 Optimize button (see Generating correction filters on page 52). To return to the magnitude response, click on the Spectrum button. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 48: Working With Graphs
Double-click on the graph to zoom back out to the previous zoom level, or click on the small “–” sign next to the zoom indicator at the top right of the display. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 49: Designing Your Target Curve
PRELIMINARY 6.2 D ESIGNING YOUR TARGET CURVE The target curve is the desired magnitude response with the C-DSP 8x12 DL processor performing digital room correction. 6.2.1 The Auto Target When first viewing the Filter Design tab, an estimated target curve suitable for your speakers is shown as the red curve. -
Page 50: Guidelines For Target Curve Design
The target curve typically has a downward-sloping or “tilting” response at high frequencies, due to the effects of limited dispersion at high frequencies and greater acoustic absorption. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 51: Saving And Loading Target Curves
To load a target curve, click on Load Target. The currently displayed channel or group of channels will have its target curve updated. (Loading a target will erase the current target curve, so be sure to save it first if needed.) miniDSP Ltd, Hong Kong / www.minidsp.com... -
Page 52: Generating Correction Filters
(The predicted impulse response can be viewed by clicking on the Impulse button.) Dirac Live Calibration Tool for miniDSP will contact the Dirac license server to verify its license, so you will need to be connected to the Internet to perform this step. If a firewall is in place, it must allow HTTP (normal web traffic) to pass. -
Page 53: Loading Filter Sets
Move the slider to adjust the master volume of the processor. Output volume can be also be adjusted by the front panel control knob or an infrared remote control. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 54: Remote Control
Adjust the rotary control until the subwoofer level sounds right. Press button 4 to switch back to Master Volume mode. Press buttons 1 and 2 to return to normal operation (for preset selection). miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 55: Channel Selection For Subwoofer Volume Control
7.3 C HANNEL SELECTION FOR SUBWOOFER VOLUME CONTROL 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 dialog appears: Check the channels to be controlled in subwoofer volume control mode. -
Page 56: Using The Minidsp Infrared Remote
Reduce or increase the volume. Each press changes the volume in 0.5 dB. Holding down a button will accelerate volume change to 3 dB steps. Mute Mutes and unmutes audio output. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 57: Learning Third-Party Remote Codes
PRELIMINARY 7.5 L EARNING THIRD PARTY REMOTE CODES The C-DSP 8x12 DL can “learn” the control codes of a third-party remote if it supports one of the following remote control codes: • Apple • • Sony • Philips RC6 To initiate 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. -
Page 58: Plugin Reference
The meters can also be used during normal operation to monitor for or to help locate level or gain structure problems. miniDSP Ltd, Hong Kong / www.minidsp.com... -
Page 59: Parametric Eq (Peq)
To link a channel, select the other channel from the drop-down menu at the top left of the PEQ screen, and click the Link checkbox. miniDSP Ltd, Hong Kong / www.minidsp.com... - Page 60 “BYPASSED” (see screenshot below). Note that this button only enables and bypasses a single filter; all other filters must be bypassed or enabled individually. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 61: Crossover (Xover)
Hovering the mouse over the curve brings up an overlay showing the frequency and the attenuation at that frequency. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... - Page 62 To link a channel, select the other channel from the drop-down menu at the top left of the Xover screen, and click the Link checkbox. miniDSP Ltd, Hong Kong / www.minidsp.com...
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Page 63: Time Delay
Each output channel can be inverted in polarity, and individually muted. When either of these options is selected, the display changes color and the label of the button reflects the current state. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 64: Custom Biquad Programming
In advanced mode, the biquad coefficients can be pasted directly into the user interface. These coefficients must be calculated using a design program – see Biquad design software below for suggestions. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... - Page 65 IMPORT button.) This file can be generated by Room EQ Wizard (REW) or by other programs. The design program must be set for a 48 kHz sample rate for the C-DSP 8x12 DL plugin. The number of filters is limited to a maximum of six.
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Page 66: Biquad Design Software
For guidance on using this feature, please refer to the app note Auto EQ with REW. Note: as of this writing, REW does not have a dedicated setting for the C-DSP 8x12 DL. To generate filters in the correct format: •... -
Page 67: Working With Configurations
8.3 W ORKING WITH CONFIGURATIONS The data that controls the audio processing C-DSP 8x12 DL is called a configuration. Four configuration presets are stored in internal memory. Presets can be selected with the wired remote panel or with an infrared remote. -
Page 68: Saving And Loading Configurations
8.3.4 Loading configurations from microSD card The C-DSP 8x12 DL can load a set of configurations from a microSD card. This can be used to load new configuration sets without requiring a computer connection. -
Page 69: Restoring To Defaults
4. Eject the (micro) SD card from the computer. 5. Power off the C-DSP 8x12 DL if it is on. Insert the microSD card into the slot on the C-DSP 8x12 DL rear panel. (It pushes in and latches.) Power on the C-DSP 8x12 DL. -
Page 70: Additional Information
Isolated DC-DC conversion, 10 to 14 V DC compliant for car audio environment Dimensions (H x W x D) 47 x 205 x 122 mm miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 71: Input Sensitivity Setting
Switch setting Off (default) On (default) Full scale input voltage (RMS) Input impedance 10 kΩ 5 kΩ 68 Ω 68 Ω Figure 7. Input sensitivity switch locations miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 72: Remote Trigger Timing
When the REMOTE MODE switch (see page 19) is set to position 2, the REMOTE OUT terminal can be used to enable and disable power amplification. The relevant delays can be configured from within the plugin. To do so, open the C-DSP 8x12 DL plugin, drop down the Display menu and select Remote Power Settings:... -
Page 73: Acoustic Measurement Setup For Rew
This diagram illustrates the connection. An analog output from the computer is connected to the relevant input of the C-DSP 8x12 DL. The output can a headphone or line output, or via a USB soundcard. The UMIK-1 is configured as the inputs source in REW, so that the output corresponding to the connected input can be measured. -
Page 74: Troubleshooting
ROUBLESHOOTING The following table lists the most common causes of issues. If following this table does not provide a solution, Obtaining Support. 9.5.1 C-DSP 8x12 DL plugin Confirm that you downloaded and installed the required Cannot install frameworks first (see Software Installation). -
Page 75: Dlct
C-DSP 8x12 DL plugin. Check that you have installed and run the miniDSP version of the Dirac Live software, called Dirac Live Calibration Tool for miniDSP. Go to the Sound System tab and click the Rescan button. -
Page 76: Firmware Upgrade
BTAINING SUPPORT 1. Work through 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 support portal at minidsp.desk.com...
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