• EQ901USB-V/VI with Powered Subwoofer Outputs


    EQ901USB-V/VI With Powered Subwoofer Outputs


    The EQ901USB-V/VI is an upgrade replacement for existing BOSE 901 Series V/VI Equalizers.  It includes BOSE 901 specific EQ curves and has a selectable powered subwoofer output with crossover.  In addition to analog inputs, USB and TOSLINK digital audio inputs are provided. The EQ901USB is also a high performance digital pre-amplifier (DAC) intended to drive high quality power amplifiers or integrated amplifiers/receivers.

    When used in the digital input mode the music stream is maintained in the digital domain all the way through the 901 equalization process.  This is the purest and highest fidelity way to drive your 901’s.

    EQ901USB Modes

    • EQ for one stereo pair of 901 Series V/VI (tone modes 1, 2, & 3)

    • EQ for two stereo pairs (4) of 901 Series V/VI (tone modes 1, 2, & 3)

    • EQ for one stereo pair of 901 Series V/VI and one or two powered subwoofers (tone mode 4)

    The EQ901USB Overview

    • USB/TOSLINK Streaming Digital to Analog Converter (DAC) with built in equalization curves for the 901 Series V/VI

    • Precise 901 Series V/VI equalization is performed digitally before the DAC in an Analog Device 400 MHz SHARC DSP processor with 24 bit resolution

    • Series V/VI EQ curves are available on all four outputs in tone modes 1, 2 & 3. In tone mode 4 the EQ901USB is in powered subwoofer mode and engages the active crossover,  with the upper full range on outputs one and two, and subwoofer low pass on outputs three and four.

    • Remote selectable inputs:

    1.    Analog

    2.    TOSLINK

    3.    USB

    • Remote selectable tonal characteristics settings:

    1.    Normal mode

    2.    Warm mode

    3.    Bright mode

    4.    Powered Subwoofer Mode (requires active subwoofer be attached)

    • Remote volume control with 0.5 dB resolution and mute

    • Ultra low distortion 2Vrms output driver stage

    What’s Included

    • EQ901USB equalizer for your BOSE 901 Series V/VI

    • Precision engineered tone adjustment equalization curves

    • Active Subwoofer Crossover (subwoofer not included)

    • Single or dual monaural subwoofer output(s)

    • Deer Creek Audio USB drive with PD USB audio driver.

    • IR Remote Control

    • USB Cable

    • US Regulated power supply- see option for global supply

    Typical Connections

    Stereo Mode

    Dual Stereo (Quad) Mode

    Active Subwoofer Mode - Tone Mode 4

    Loading your USB drivers (PC only)

    Prior to installing the USB drivers, be sure the following programs are up to date.

    • Microsoft .NET framework (version 3.5 or later)

    • Latest version of Adobe Flash

    • Latest version of Adobe Air

    If you haven’t updated these recently, you should download and install the latest versions prior to running the USB drivers.

    Driver installation (PC only)

    The driver for the miniDSP 2x4 HD enables USB streaming from the computer to the EQ901USB.  To install the driver, the EQ901USB must be connected to the computer with a USB cable and powered on with the supplied AC adapter.  Then select and load the appropriate driver for your PC version from the enclosed CD.

    • miniDSP_UAC2_v4.47.0_ForWin7_8_10.exe (for windows 10)

    Hardware Installation

    When audio input and output connections are being made, be sure that all associated equipment is powered off.  Also, when you power the EQ901USB on and off, be sure that the associated equipment is off. Connect power to the EQ901USB before turning associated equipment on.

    Level Setting

    Your EQ901USB is being delivered with an internal level (gain) setting of 0db (max, no insertion loss), which you will adjust with the supplied remote control.   It has been set with the analog Inputs selected, be sure to turn down your music source to protect your system at turn on. Once you have your inputs connected and all components on, you can adjust all the gain levels for optimal volume midposition control performance.

    Subwoofer Settings for Tone Mode 4

    To begin, your subwoofer should be set at mid level gain, and the crossovers should be set at the highest frequency or disabled.  After you have the system up and running adjust the subwoofer level, phase, and crossover to get the best response.

    USB Music Server Volume Setting

    If you are streaming digital music via a server such as foobar2000, JRiver, Roon, etc., begin with the level set low on the server application.

    Remote Control Functions

    The supplied IR remote control has the following functions and is the only user control interface:

    Tone configurations selected on the remote control:

    1.    Normal

    2.    Warm

    3.    Bright

    4.    Powered Subwoofer Mode

    The input source is selected by scrolling on the remote control source button:

    1.    Analog

    2.    TOSLINK

    3.    USB

    IR Remote Control Functions


    Selecting Tonal Characteristics Modes

    Selection of the tone mode is generally a subjective choice based on what sounds best to you.  Technically, Normal mode is the most neutral, Warm mode provides a bit less treble with more bass, Bright mode adds a bit more treble and bass reduction, and Powered Subwoofer Mode engages the active crossover.  Both pairs of outputs are always on.  

    As an example, rooms with heavy curtains, rugs, and soft furniture may sound better with the Bright mode.


    • EQ901USB-V/VI platform base: miniDSP 2x4 HD

    • Digital Signal Processor Engine: Analog Devices Fixed point DSP SHARC ADSP-21489

    • USB controller: XMOS xCORE-200

    • Digital to Analog Converter (DAC): AK4626A

    • Internal Processing resolution & Sample rate: 32 bit / up to 192 kHz

    • Audio Input Connectivity:  RCA, TOSLINK (optical), USB Audio

    • Audio Output Connectivity:  Unbalanced output, RCA

    • Input / Output Max Levels: In 2 Vrms / 4 Vrms (jumper-selectable), Out 2 Vrms

    • Input Impedance: 10 k Ω

    • Output Impedance: 560 Ω

    • Filtering Technology: FIR + I/IIR

    • Dimensions: 27 x 119 x 107 mm

    • Power: 12V DC single supply, 2.1 mm round plug, 2.5 Watt

    • IR Remote: miniDSP Remote

    Active Crossover in Powered Subwoofer Tone Mode 4

    Analog Input Level

    The analog audio input levels are switchable between 2 and 4 Vrms to accommodate use with most equipment.  The EQ901USB is shipped with the analog input level set to 2 Vrms.

    Warranty Terms

    This product is warranted to be free from defects in materials and workmanship for a period of one year from the invoice date.  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.  The customer provides return shipping to Deer Creek Audio. Deer Creek Audio is an Authorized miniDSP dealer.

    Shipping: US Domestic orders ship free, Canadian FedEx is $24.95, Global FedEx is $39.95

    Please contact us with any questions you may have