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Summary of Contents for miniDSP EQ901 Series
- Page 1 OUT BOXED AUDIO PROCESSOR OUT AUDIO PROCESSOR BARE BOARD User Manual miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
- Page 2 Revision history Revision Description Date V1.5 miniDSP PCB revision - Rev1 31-05-2010 V1.6 New miniDSP PCB revision – Rev2 16-12-2010 V1.7 Jumper for RevA & B 26-03-2012 V2.0 Updated and revised for Rev3 PCB 15-06-2014 V2.1 Merged with kit manual 30-06-2014 V2.2...
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Page 3: Table Of Contents
Supply DC power ..........................21 Continue to operate offline ........................ 22 2.8.1 Notes on powering the miniDSP in offline mode ................. 22 2.8.2 Notes on modifying the configuration while in offline mode ............22 Plugin Architecture and Features ........................ 23 System settings .......................... - Page 4 Master/Slave master clock selection ....................43 5.6.1 Examples ............................ 43 Additional Information ..........................44 Specifications ............................. 44 Troubleshooting ..........................45 Obtaining Support ..........................46 miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 5: Important Information
2x4 may cause to your system. Finally, note that the miniDSP 2x4 is a very flexible device, and many of the questions we receive at the tech support department are already answered in this user manual and in the online... -
Page 6: Warranty Terms
ARRANTY ERMS 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 7: Product Overview
Hardware unit In this case, the hardware unit is the miniDSP 2x4 or miniDSP kit. It has two analog inputs and four analog outputs. The internal processor converts the analog input signal to digital form, processes it according to the instructions from the plugin, and then converts it to analog again for the outputs. -
Page 8: Choosing The Right Minidsp
The miniDSP kit consists of just the circuit board without the external chassis. The board can be integrated into any build that requires the addition of flexible yet cost-effective audio processing. miniDSP make a large and growing number of hardware platforms for particular needs. If the 2x4 is not the most suitable hardware, then other options are available. -
Page 9: Choosing A Plugin
A two-way crossover splits the audio frequency band into two. Typically, this is used to feed high frequencies to tweeters and low frequencies to woofers. A single miniDSP 2x4 or miniDSP kit is used for stereo, as shown in this... -
Page 10: Four-Way Crossover Plugins
Frequency bands can overlap if needed, as all crossover filters are independently specified. Two miniDSP 2x4 units or miniDSP kits are needed for stereo, as shown in this diagram (a protection capacitor on each tweeter is optional but generally recommended):... -
Page 11: Non-Crossover Plugins
Mono subwoofer from stereo signal, and high passed speakers In this configuration, the miniDSP 2x4 or miniDSP kit is used to generate a single mono subwoofer feed from a stereo signal, as well as to high-pass the main speakers. The connection diagram is shown as follows:... - Page 12 2 to outputs 3 and 4: One to four subwoofers from stereo signal If the miniDSP is used only for subwoofer control/EQ, up to four separate subwoofer signals, each with different delay and EQ, can be generated from a stereo signal:...
- Page 13 More advanced subwoofer applications There may be cases where you need more features than provided by the miniDSP 2x4 and miniDSP Kit – for example, higher signal levels, longer delays, or more output channels. In that case, please see the more...
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Page 14: The Minidsp Workflow
If you purchased your product directly from miniDSP, your software will be available from the User Downloads section of the miniDSP website when your order ships. You will need to be logged into the website with the account you created when purchasing to access the download. -
Page 15: Mac
To run the plugin, locate it 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: Familiarize Yourself With The Plugin
AMILIARIZE YOURSELF WITH THE PLUGIN Before connecting your computer to the miniDSP 2x4 or kit board, it’s worth familiarizing yourself with the user interface presented by the plugin. When it starts, you will see the plugin screen as shown below. (This particular example is the 2way Advanced plugin, but they all share a common layout.) -
Page 17: Go Into Online Mode
A USB connection to your computer is needed to go into online mode. Simply connect the supplied USB cable from a free USB port on your computer to the miniDSP 2x4 or kit board. (In the case of the kit, see also connectivity.) The USB connection will power the miniDSP hardware as well as provide data communication. -
Page 18: Perform Initial Configuration
ET AUDIO UP AND RUNNING With the initial configuration done and now that you are familiar with the various controls, it’s time to connect the miniDSP into your system. Before doing so, unplug the USB cable from the miniDSP 2x4 or kit board. 2.5.1 Make audio connections Analog audio input and output connections are made directly to the RCA input and output jacks. -
Page 19: Reconnect To The Plugin
Supply DC power. Click on the Synchronize button again. This time, be sure to select the Synchronize option from the dialog box: The miniDSP is now in online mode again. 2.5.3 Initial audio check Power on your connected equipment: first on the input side (e.g. preamp), then on the output side (e.g. power amps). -
Page 20: Fine-Tune Your Configuration
With your initial setup running, you can now proceed to fine-tune and optimize your system. Although there are some applications where you can perform tuning by ear, applications like active crossovers and subwoofer integration are best optimized with the aid of acoustic measurements. The miniDSP UMIK-1... -
Page 21: Supply Dc Power
Note: Prior to Rev3 of the miniDSP circuit board (released in June 2014), auxiliary power for the miniDSP 2x4 and miniDSP kit is provided via a Phoenix connector with screw terminals instead of a 2.1mm DC connector. If you have an older version of the board, please refer to the older manuals miniDSP 2x4 User Manual v1.7... -
Page 22: Continue To Operate Offline
With your miniDSP hardware and software configured and a DC power source connected, you can continue to operate the miniDSP in offline mode – that is, without the computer connected. To do so, simply turn the connected equipment on again – source and preamp first, then power amps. The miniDSP “remembers” the configuration last set, and will continue to operate without the computer. -
Page 23: Plugin Architecture And Features
If the plugin is in offline mode, the configuration settings will be downloaded to the miniDSP hardware unit the next time it is put into online mode (provided that the Synchronize option is selected from the dialog box). - Page 24 If the plugin is in online mode, the defaults settings will be downloaded immediately to the miniDSP hardware unit. If the plugin is in offline mode, the default settings will be downloaded to the miniDSP hardware unit the next time it is put into online mode.
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Page 25: Input Selection, Level, And Metering
Most plugins have two input control blocks. The 4-way plugin, 4Way Advanced, has a single input control block, and an additional control to choose which input to use. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 26: Output Level, Delay, And Metering
Mutes that output channel. This is helpful when testing and refining your configuration. (For example, mute the tweeter to test the woofer, and vice versa.) miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... - Page 27 The Rear/center channel plugin has an additional delay block that applies to both output channels. A delay of up to 27 ms can be set: miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 28: Graphic Eq
Reset Clicking the Reset button resets all sliders to 0 dB. Link channels If selected, the slider positions are applied to both audio channels. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 29: Parametric Eq
A peaking filter with 6 dB boost, centered at 2 kHz • A high-shelf filter with 6 dB cut (gain set to a negative value), centered at 10 kHz miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... - Page 30 This button selects a file exported from Room EQ Wizard’s automatic equalization function. For more information, see the app note Auto-EQ tuning with REW and the section Custom biquad programming. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 31: Crossover
In a four-way crossover, the signal is split into four frequency bands: In the miniDSP 2x4 plugins, each output channel has a high pass filter and a low pass filter, each of which can be set to one of a range of filter types and slopes, or individually bypassed. Clicking on the bars labeled “CH1 Bandpass Filter OUT1,”... - Page 32 Bypass Clicking on the Bypass button disables that high pass or low pass filter. (All other crossover filters are still operational unless individually bypassed.) miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 33: High Pass And Low Pass Filters
Copy function to copy settings from channel 1 to channel 2. In Stereo Mode, the two output channels are independent – that is, the plugin behaves as a two-way crossover. miniDSP Ltd, Hong Kong / www.minidsp.com... -
Page 34: Keyboard Shortcuts
3.9 K EYBOARD SHORTCUTS The miniDSP 2x4 plugins support the use of the keyboard for many operations. The Tab key moves the focus to the next user interface element. A light blue surrounding box indicates the user interface element with the focus if it is a text entry box, a button, or a block in the signal flow diagram. -
Page 35: Custom Biquad Programming
For example, you can create hybrid crossovers with more than one cutoff frequency, create crossover filter types beyond those provided in the easy-to-use “basic”... - Page 36 After pasting in the biquad coefficients, click on the Process button for them to take effect. For a cut-and-paste example of the biquad format, click on the Help button and then the Crossover Input Format button. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 37: The Plugin Calculator
Active Crossover Designer (ACD) by Charlie Laub performs the complete set of functions for active crossover design and generates biquad coefficients as its output. Download it here (requires Microsoft Excel): • http://audio.claub.net/software/ACD/ACD.html miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 38: Optimizing Gain Structure
– high enough to maximize digital resolution and minimize noise, but not so high as to result in clipping and distortion. The miniDSP 2x4 and kit board include a jumper to select their input sensitivity, allowing them to be used in a wider variety of systems. -
Page 39: Kit Documentation
OCUMENTATION The miniDSP kit is a bare circuit board that can be incorporated into your own chassis and combined with other electronics components. This section documents the supported connectivity and configuration of the kit board. 5.1 B OARD LAYOUT AND FEATURES This diagram shows the key features of the board. -
Page 40: Expansion Header And I2S Connectivity
For more information, please read the I2S technical note available in the download section of our website. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 41: Usb Connectivity
Although this is a standard connector, you should nonetheless confirm the pin-out with the manufacturer, or you could easily cause damage to your computer or miniDSP kit. In most cases, pins 4 and 5 can be identified by a black wire, but once again, DO check the manufacturer’s spec of the connector to prevent any short-circuits. -
Page 42: Volume Control
A single potentiometer can be connected to multiple miniDSP kit boards. This allows master volume control of eight or more output channels. This diagram illustrates the wiring for master volume control of multiple boards: Finally, to enable the master volume control, use the Enable button in the System settings tab of the plugin user interface. -
Page 43: Master/Slave Master Clock Selection
Board used with miniDIGI, or with miniDIGI+miniAMP Set jumper to Slave. Board used with USB interface and direct I2S connection Set jumper to Slave. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 44: Additional Information
USB-powered, or 4.5 – 24 VDC @150 mA via 2.1mm center- Power supply positive Dimensions (H x W x D) 27 x 107 x 110 mm miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 45: Troubleshooting
6.2 T ROUBLESHOOTING The following table lists the most common causes of issues with the miniDSP 2x4. If following this table does not provide a solution, see Obtaining Support below. Item# Symptoms Troubleshooting recommendation Confirm that you downloaded and installed the required... -
Page 46: Obtaining Support
6.3 O BTAINING UPPORT 1. Check the forums on miniDSP.com to see if this issue has already been raised and a solution or solutions provided. 2. Contact miniDSP via the support portal at support.minidsp.com with: a. The specific product you are having an issue with.
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