miniDSP EQ901 Series User manual

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2X4
2-IN 4-OUT BOXED
AUDIO PROCESSOR
KIT
2-IN 4-OUT AUDIO
PROCESSOR BARE BOARD
User Manual

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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
Added 2x4 Advanced plugin
15 May 2015
V2.3
Removed obsolete plugins, new product photographs
6 Oct 2015
V2.4
Revised installation procedure, Mixer plugin obsolete
31 Jan 2017
V2.5
Removed kit as NLA, Stereo Graphic EQ plugin obsolete
4 April 2019
V2.6
Kit not NLA
23 August 2019
V2.7
Updated support links
6 July 2020
V2.8
Adobe AIR and Flash no longer needed
1 February 2021

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TABLE OF CONTENTS
Important Information........................................................................................................................................ 5
System Requirements ...................................................................................................................................... 5
Disclaimer/Warning ......................................................................................................................................... 5
Warranty Terms............................................................................................................................................... 6
A Note on this Manual ..................................................................................................................................... 6
1Product Overview......................................................................................................................................... 7
1.1 The miniDSP concept............................................................................................................................ 7
1.2 Choosing the right miniDSP .................................................................................................................. 8
1.3 Choosing a plugin ................................................................................................................................. 9
1.3.1 Two-way crossover plugins ........................................................................................................... 9
1.3.2 Four-way crossover plugins......................................................................................................... 10
1.3.3 Non-crossover plugins ................................................................................................................ 11
1.3.4 Subwoofer applications .............................................................................................................. 11
2The miniDSP Workflow............................................................................................................................... 14
2.1 Download and install the plugin ......................................................................................................... 14
2.1.1 Windows .................................................................................................................................... 14
2.1.2 Mac ............................................................................................................................................ 15
2.2 Familiarize yourself with the plugin .................................................................................................... 16
2.3 Go into online mode........................................................................................................................... 17
2.4 Perform initial configuration............................................................................................................... 18
2.5 Get audio up and running................................................................................................................... 18
2.5.1 Make audio connections............................................................................................................. 18
2.5.2 Reconnect to the plugin.............................................................................................................. 19
2.5.3 Initial audio check....................................................................................................................... 19
2.6 Fine-tune your configuration.............................................................................................................. 20
2.7 Supply DC power................................................................................................................................ 21
2.8 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
3Plugin Architecture and Features................................................................................................................ 23
3.1 System settings .................................................................................................................................. 23
3.2 Input selection, level, and metering.................................................................................................... 25
3.3 Output level, delay, and metering ...................................................................................................... 26
3.4 Graphic EQ ......................................................................................................................................... 28
3.5 Parametric EQ .................................................................................................................................... 29
3.6 Crossover ........................................................................................................................................... 31
3.7 High pass and low pass filters ............................................................................................................. 33
3.8 Mono/stereo mode............................................................................................................................ 33
3.9 Keyboard shortcuts ............................................................................................................................ 34
3.10 Custom biquad programming ............................................................................................................. 35

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3.10.1 What’s a “biquad? ...................................................................................................................... 35
3.10.2 Using custom biquad programming ............................................................................................ 35
3.10.3 The plugin calculator................................................................................................................... 37
3.10.4 Biquad calculation spreadsheet .................................................................................................. 37
3.10.5 Room EQ Wizard (REW) .............................................................................................................. 37
3.10.6 Active Crossover Designer (ACD)................................................................................................. 37
4Optimizing Gain Structure .......................................................................................................................... 38
5Kit Documentation...................................................................................................................................... 39
5.1 Board layout and features .................................................................................................................. 39
5.2 Expansion header and I2S connectivity............................................................................................... 40
5.3 USB connectivity ................................................................................................................................ 41
5.4 Bypass/reset....................................................................................................................................... 41
5.5 Volume control................................................................................................................................... 42
5.6 Master/Slave master clock selection................................................................................................... 43
5.6.1 Examples .................................................................................................................................... 43
6Additional Information ............................................................................................................................... 44
6.1 Specifications ..................................................................................................................................... 44
6.2 Troubleshooting................................................................................................................................. 45
6.3 Obtaining Support .............................................................................................................................. 46

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IMPORTANT INFORMATION
Please read the following information before use. In case of any questions, please contact miniDSP via the
support portal at support.minidsp.com.
SYSTEM REQUIREMENTS
To configure the miniDSP 2x4, you will require a Windows PC or Apple Mac OS X computer with the following
minimum specification:
Windows
•PC with 1GHz or higher processor clock speed. Intel® Pentium®/Celeron® family, or AMD K6®/AMD
Athlon®/AMD Duron® family, or compatible processor recommended.
•512 megabytes (MB) of RAM or higher
•Keyboard and mouse or compatible pointing device
•USB 2.0 port
•Microsoft• ® Windows® Vista® SP1/ XP pro SP2/Win7/Win8.1/Win10
•Microsoft• ® .NET framework v3.5 or later
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
•Mac OS X 10.8 or higher
•USB 2.0 port
DISCLAIMER/WARNING
miniDSP cannot be held responsible for any damage that may result from the improper use or incorrect
configuration of this product. The miniDSP 2x4 is a powerful tool and can easily generate signals that will
damage your audio system if not used properly. Please read this manual carefully to ensure that you fully
understand how to operate and use this product.
To avoid mishap, be sure to configure the miniDSP 2x4 before connecting anything to its outputs, as described in
the section The miniDSP workflow. This will ensure that the software is correctly configured and will greatly
reduce any chance of causing damage to your system. Once again, miniDSP cannot be responsible for any
damage the miniDSP 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 application notes on the
miniDSP.com website. So please take the time to carefully read this user manual and the online technical

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support. And if an issue arises with your unit, please read through the Troubleshooting section first. Thank you
for your understanding!
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. If in doubt, contact miniDSP prior to use.
ANOTE ON THIS MANUAL
This User Manual is designed for reading in both print and on the computer. If printing the manual, please print
double-sided. The embedded page size is 8 ½” x 11”. Printing on A4 paper will result in a slightly reduced size.
For reading 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
much easier:
•In Adobe Reader on Windows, click on the “bookmarks” icon at the left. The table of contents will appear
on the left and can be unfolded at each level by clicking on the “+” icons.
•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.

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1PRODUCT OVERVIEW
Thank you for choosing the miniDSP kit board or the miniDSP 2x4 audio processor. Combined with an extensive
range of plugins, the miniDSP kit and miniDSP 2x4 offer a compact, inexpensive, yet powerful and flexible
platform for many audio applications:
•Active crossovers
•System equalization with parametric EQ
•Subwoofer integration
•Audio mixing and routing
•Center and rear channel synthesis
1.1 THE MINIDSP CONCEPT
The miniDSP concept is “one hardware unit + one software plugin = audio processing solution.” This concept
leverages the inherent flexibility of DSP (digital signal processing) to deliver a range of flexible but cost-effective
solutions.
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. See Choosing the right miniDSP for more information on miniDSP hardware.
Software plugin
The software plugin is installed on your PC or Mac, and determines the processing that the DSP
will perform. It provides a friendly user interface, and downloads instructions into the miniDSP
hardware unit that tell it how to process the incoming audio signal. See Choosing a plugin for
more information on plugins.

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1.2 CHOOSING THE RIGHT MINIDSP
The miniDSP 2x4 and miniDSP kit provides two analog inputs and four analog outputs. They are a simple, cost-
effective DSP solution for many audio processing needs. They are also an excellent starting point for learning
about DSP for audio applications.
The miniDSP 2x4 is a self-contained “miniDSP in a box”:
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.
miniDSP Balanced 2x4
Used for applications that require balanced audio connections, such as in pro-sound and in some
car applications. Balanced connections provide additional immunity to noise over long cable
runs and in electrically noisy environments.
Other platforms
miniDSP makes many other hardware units with up to ten output channels, with sophisticated
digital room correction capabilities, and with inbuilt amplification (plate amps). Many are
available in either kit of “boxed” form. See the full range of miniDSP products.

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1.3 CHOOSING A PLUGIN
The plugin that you choose depends on the specifics of your application. Currently, there are eight plugins
available for the miniDSP 2x4 and miniDSP kit.
1.3.1 Two-way crossover plugins
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
diagram (protection capacitors on the tweeters are optional but generally recommended):
2x4 Advanced
The 2x4 Advanced crossover plugin provides parametric EQ on both inputs and on all four
outputs, fully independent crossovers/filters with a wide range of filter slopes (up to 48
dB/octave) on all four outputs, and a matrix mixer. Two-way active loudspeakers are among the
wide range of applications supported by this plugin. For more information, see the datasheet.
2way Advanced
The 2way Advanced crossover plugin provides parametric EQ on both inputs and on all four
outputs, as well as fully independent crossovers with a wide range of filter slopes up to 48
dB/octave. It is typically used for building fully active two-way loudspeakers. For more
information, see the datasheet. Note: in most applications, this plugin is superseded by the 2x4
Advanced plugin (see above).
2way Advanced 21
The 2way Advanced 21 plugin is similar to the 2way Advanced plugin, but it also allows two of
the output channels to be summed together to provide a mono subwoofer feed. It is therefore
used to derive a mono subwoofer signal from a stereo signal, or to create “sub sat” systems. For
more information, see the datasheet. Note: in most applications, this plugin is superseded by
the 2x4 Advanced plugin (see above).

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1.3.2 Four-way crossover plugins
A four-way crossover splits the frequency spectrum of a single input channel into up to four distinct bands.
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):
2x4 Advanced The new 2x4 crossover plugin provides parametric EQ on both inputs and on all four outputs,
fully independent crossovers/filters with a wide range of filter slopes (up to 48 dB/octave) on all
four outputs, and a matrix mixer. Three-way and four-way active loudspeakers are among the
wide range of applications supported by this plugin. For more information, see the datasheet.
4way Advanced
The 4way Advanced plugin provides parametric EQ on one input channel and on all four output
channels, as well as fully-independent crossovers with a wide range of filter slopes up to 48
dB/octave. It is typically used to build a fully active three-way or four-way active loudspeaker
(two miniDSP hardware units required for stereo). For more information, see the datasheet.
Note: in most applications, this plugin is superseded by the 2x4 Advanced plugin (see above).

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1.3.3 Non-crossover plugins
Two plugins provide specialized audio processing functions.
Rear/Center Channel
The Rear/Center Channel plugin provides a summed (L+R) or difference (L-R or R-L) signal for
use in deriving center or rear channels from a stereo signal. It also provides a 31-band graphic
EQ, high pass and low pass filters, and long delay (total 31 ms). For more information, see the
datasheet.
1.3.4 Subwoofer applications
For subwoofer applications, we usually recommend the use of the 2x4 Advanced plugin, because of its flexibility
and ability to handle many different subwoofer configurations. This flexibility is provided by the use of the
matrix mixer, which maps and mixes input channels to output channels. Here are four common subwoofer
scenarios and the recommended routing for each.
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:
To accomplish this configuration, use the matrix mixer to mix input channels 1 and 2 to output 1, and to send
input 1 to output 3, and input 2 to output 4:

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Stereo subwoofer from stereo signal
To derive a separate left and right subwoofer signal from the stereo left and right signals, input channel 1 is sent
to outputs 1 and 2, and input channel 2 is sent to outputs 3 and 4 (this is essentially the same as a two-way
crossover):
To accomplish this configuration, use the matrix mixer to send input channel 1 to outputs 1 and 2, and input
channel 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:
To accomplish this configuration, use the matrix mixer to mix both input channels to all four output channels:

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One to four subwoofers from mono signal (e.g. AVR)
If you have an A/V processor or A/V receiver, it has already combined various signals together to generate a
single subwoofer signal. The miniDSP 2x4 can generate up to four subwoofer signals with different EQ and delay
from the AVR subwoofer output:
To accomplish this configuration, the routing matrix sends input channel 1 to all four output channels:
Two to four subwoofers from dual mono signal (e.g. AVR)
Some A/V processors and A/V receivers provide two subwoofer outputs. You can send each input to any of the
outputs. For example, this routing screen illustrates the case where input 1 is sent to output 1, and input 2 is
sent to outputs 2 through 4:
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
powerful miniDSP units 10x10 Hd, nanoDIGI 2x8 b, nanoAVR HD, and nanoAVR HDA.

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2THE MINIDSP WORKFLOW
While each plugin is different, there is a common procedure or workflow that we recommend for all of them.
1. Download and install the plugin
2. Familiarize yourself with the plugin
3. Go into online mode
4. Perform initial configuration
5. Get audio up and running
6. Fine-tune your configuration
7. Supply DC power
8. Continue to operate offline
2.1 DOWNLOAD AND INSTALL THE PLUGIN
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.
If you purchased your product from a miniDSP dealer, you will receive a coupon together with the product.
Redeem this coupon and select the plugin you ordered at the link below:
•https://www.minidsp.com/support/redeem-coupon
The User Downloads link is visible from the dropdown menu at the top right of the website page:
Navigate to the miniDSP Plugins section. Locate the plugin that you wish to download (only purchased plugins
will be visible), and then click on the Download button.
Once the file is downloaded, unzip it (on Windows, right-click and select “Extract All...”; on Mac, double-click).
Note: the plugin may need a network connection the first time the plugin is used. If the plugin does not start
properly, see Troubleshooting.
2.1.1 Windows
The miniDSP software requires that other frameworks be installed for it to work. For Windows 7 and later, these
packages will be installed automatically. For earlier versions of Windows, please download and install the

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following before attempting to install any miniDSP software. You can also manually install these if you receive an
error message that required software is missing.
•Microsoft .NET framework (version 3.5 or later)
To install the plugin:
1. Navigate to the Windows folder of the software download.
2. Double-click on the MiniDSP_Plugin.exe installer program to run it. (The name will depend on the specific
plugin that you downloaded.) We recommend that you accept the default installation settings.
3. The plugin will start automatically if you accepted the default installation settings. To make it quicker to run
in future, right-click on its icon in the taskbar and select “Pin to taskbar.”
2.1.2 Mac
To install the plugin:
1. Navigate to the Mac folder of the software download.
2. The installer program is named MiniDSP_Plugin.pkg. (The name will depend on the specific plugin that you
downloaded.) To run it, double-click on it, or right-click and open as described below. We recommend that
you accept the default installation settings.
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.
Note: If double-clicking on an installer brings up a message that the installer cannot run, use this alternate
method:
1. Right-click on the installer (or click while holding the Control key). (The name will depend on the specific
plugin that you downloaded.)
2. On the menu that pops up, move the mouse over the “Open With” item and then click on “Installer
(default).”
3. The following window will appear. Click on “Open.”

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2.2 FAMILIARIZE 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.)
System tabs
These tabs access various screens to provide access to different types of functionality.
Control buttons (Synchronize, Master Mute, Help)
The Synchronize button connects the user interface to the miniDSP hardware unit, downloading
configuration data and putting it into online mode. The Master Mute button enables or disables
all audio processing. Finally, the Help button brings up the help screen (shown above).
Flow diagram
The flow diagram (or “block diagram”) is a schematic representation of the audio processing that
takes place in the miniDSP hardware unit. Audio “flows” through the diagram from the inputs on
the left to the outputs on the right. Clicking on each block will show its control interface in the
detail pane underneath it.
Detail pane
The detail pane shows the control interface of the processing blocks in the flow diagram. For the
specifics of each type of processing block, see Plugin architecture and features.

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Now is a good time to explore the plugin and become familiar with all of the controls in each of the signal
processing blocks. Click on each of the blocks in the block diagram to see what the controls are.
At this time, the plugin is still in offline mode, so any changes you make will not be downloaded into the miniDSP
hardware. Since we will reset all of the processing parameters in the next section, you can feel free to
experiment with the user interface at this point.
2.3 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 USB
connectivity.) The USB connection will power the miniDSP hardware as well as provide data communication.
Don’t connect other equipment to the miniDSP 2x4 or kit board at this stage. That will be done after
correctly initializing the configuration.
Click on the Synchronize button, and the following dialog will appear:
Click on the Restore to Default button. This is essential the first time you connect to the miniDSP, as it ensures
that the miniDSP hardware unit contains an internal set of data that it understands. (Subsequently, you will
generally use the Synchronize button.)
Provided all goes well, you will see a confirmation dialog. The plugin is now in online mode. Any change that you
make in the plugin user interface will be immediately downloaded to the miniDSP hardware unit, so the change
will take effect in real time.

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2.4 PERFORM INITIAL CONFIGURATION
As long as you pressed Restore to Default above, your plugin and the onboard software in the miniDSP
hardware have been set to their default state. Depending on your plugin and application, you may now need to
change these settings to fit your specific application.
For example:
•Set crossover frequencies and slopes
•Set up any essential equalization
•Mute unused input and output channels
At this point, save your initial configuration to a file. A configuration is the set of all audio processing
parameters. You should save your configuration to a file on a regular basis, to ensure that you do not lose your
work if you inadvertently restore the miniDSP to default settings. For more information on configurations, see
System settings.
2.5 GET 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. When making
these connections, make sure that the equipment being connected is powered off.
The specific use of input and output connections depends on your application and the plugin chosen. See
Choosing a plugin for more information.

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When making analog audio connections, just push the RCA connectors on and pull them off. Try to avoid
twisting the plugs to get them on and off.
2.5.2 Reconnect to the plugin
With the connected equipment still turned off, reconnect the USB cable to the computer. You can optionally
connect an auxiliary power supply at this time –see 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).
Turn the volume on your source and/or amplification down low, and start playing music or a pink noise test
signal. Gradually increase the volume until your hear audio quietly coming from the speakers. Verify that the
plugin is performing the intended function. For example, if you are implementing a two-way crossover, confirm
that the tweeter is playing high frequencies, and that the woofer is playing low frequencies. (If you have a
measurement microphone and software that allows real time spectrum analysis, then by all means use it.)

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2.6 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 is an
ideal accessory for this purpose, and works with any measurement program including the free Room EQ Wizard.
For active crossovers
Measure each driver individually, at (typically) a distance of 0.5 or 1 meter (1.5 or 3 feet). Use
these measurements to adjust the parametric equalizer for each driver, and to fine-tune the
crossover (frequency and slope) settings.
For subwoofer integration
Measure the subwoofer with the microphone placed at the listening position. Typically, moving
the subwoofer to find the best response without EQ will yield best performance after EQ. The
REW auto-EQ function can be used to quickly generate an optimum equalization setting.
For room correction
Measure the response of the system with the microphone placed at the listening position. Apply
equalization using the parametric equalizer. Adjustments can be confirmed by measurement as
well as listening.
For more detailed information on these topics, see our extensive collection of application notes on acoustic
measurement and digital crossovers.
Be sure to save your configuration on a regular basis while working on fine-tuning it. Configurations can be
saved to different files, in order to archive different versions, or to enable auditioning of alternative
configurations. See System settings for more information on configurations.