• EQ901USB Equalizer - Digital Preamplifier - DAC for BOSE 901 - Select your Series I/II or III/IV or V/VI


    EQ901USB Equalizer - Digital Preamplifier - DAC for BOSE 901® Select your Series I/II or III/IV or V/VI

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    The EQ901USB is an upgrade replacement for existing BOSE 901® Equalizers. The EQ901USB Series features four specifically designed equalization curve sets unique to each Series:  I/II, III/IV or V/VI (select your series when ordering*).

    The EQ901USB is also a high performance digital pre-amplifier (DAC) intended to drive high quality power amplifiers or integrated amplifiers/receivers. Analog, USB and TOSLINK digital audio inputs are provided.

    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 901s.


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

    • Precise BOSE 901 equalization is performed digitally before the DAC in an Analog Device 400 MHz SHARC DSP processor with 24-bit resolution

    • The four BOSE 901 tone modes (EQ curves) are available on all four outputs. Two identical stereo pairs outputs are available allowing for dual active stereo systems (two stereo power amps) or the addition of an active subwoofer(s)

    • Remote selectable inputs:

      • Analog

      • TOSLINK

      • USB

    • Remote selectable tone modes:

      • Normal mode

      • Enhanced mode

      • Warm mode

      • Low frequency reduction mode

    • Remote volume control with 0.5dB resolution and mute

    • Ultra low distortion 2.0 Vrms output driver stage

    • Selectable input sensitivity of 2.0 Vrms or 4.0 Vrms

    What’s Included

    • EQ901USB equalizer for BOSE 901 Series I/II, III/IV or V/VI

    • Four precision engineered BOSE 901 equalization curves

    • Two identical stereo pairs outputs are available allowing for dual active stereo systems (two stereo power amps) or the addition of an active subwoofer(s)

    • Deer Creek Audio USB drive with PC USB audio driver 

    • IR Remote Control

    • USB Cable

    • U.S. regulated power supply

    Typical Connections

    Stereo Mode

    Dual Stereo (Quad) Mode

    Active Subwoofer Mode

    Tape/Processor Loop Setup

    IR Remote Control

    Setting Tone Modes

    Selection of the tone mode is generally a subjective choice based on what sounds best to you. Specifically, Normal mode is the most neutral, Enhanced mode provides a richer sound with more treble and bass, Warm mode adds midrange with slight treble reduction, and Low Frequency Reduction mode is intended to control bass in smaller rooms or on “boomy” recordings.


    • EQ901USB 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 and sample rate: 32 bit / up to 192kHz

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

    • Audio Output Connectivity:  Unbalanced output, RCA

    • Input / Output Max Levels: In 2.0 Vrms / 4.0 Vrms (jumper-selectable), Out 2.0 Vrms

    • Input Impedance:  10kΩ

    • Output Impedance:  560Ω

    • Filtering Technology:  FIR + I/IIR

    • Dimensions: 27h x 119w x 107d mm

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

    • IR Remote:  miniDSP Remote


    • 30-day 100% satisfaction guarantee

    • U.S. technical support through Deer Creek Audio

    • Installation guide and phone support

    • Deer Creek Audio is an authorized miniDSP dealer

    Warranty Terms

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


    Orders received by 2 PM MT are shipped the same business day. U.S. domestic orders ship FedEx 2-Day Express for free. Canadian orders ship FedEx for $24.95, other international orders ship FedEx for $39.95 (global carrier may vary).

    User Links

    EQ901USB User Guide

    EQ901 Features Comparison Guide
    Connecting your EQ901 to an Audio Video Receiver (AVR)
    EQ901USB Subwoofer Option Supplement

    Podcasts, in collaboration with WNY Media Works

    Deer Creek Audio EQ901: How It All Began

    Deer Creek Audio EQ901: All Models

    Deer Creek Audio EQ901: The Hook Up