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.
Features
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.
Specifications
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
Support
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.
Shipping
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).
