EQ901USB Equalizer - Digital Preamplifier - DAC for BOSE 901 Series I/II -III/IV or V-VI
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 901’s.
The EQ901USB Overview
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:
Remote selectable tonal characteristics settings:
Low frequency reduction mode
Remote volume control with 0.5 dB resolution and mute
Ultra low distortion 2 Vrms output driver stage
Selectable input sensitivity of 2 Vrms or 4 Vrms
EQ901USB equalizer for your BOSE 901 Series I/II, III/IV or V/VI (select your series when ordering)
Four precision engineered tone adjustment 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
US Regulated power supply - see option for global supply
Dual Stereo (Quad) Mode
Active Subwoofer Mode
Tape/Processor Loop Set Up
IR Remote Control
Setting Tone Tone Characteristics 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 & 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
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.