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.
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:
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
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
US Regulated power supply- see option for global supply
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)
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.
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:
4. Powered Subwoofer Mode
The input source is selected by scrolling on the remote control source button:
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.
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.
Please contact us with any questions you may have