EQ901 Elite User Guide

Introduction

The EQ901 Elite is an ultra high performance replacement for existing BOSE 901 Series I/II, III/IV or V/VI equalizers. The unit provides the BOSE 901 specific equalizer curves with four tone modes that accommodate a wide range of room conditions and recording variations. Designed for use with high-quality pre/power amplifiers or integrated amplifiers and receivers, the unit builds on our EQ901B series with lower distortion, greater dynamic range and higher fidelity, providing audiophile-grade digital signal processors, DACs and analog signal stages.

1. Features

The EQ901 Elite Series features four specifically designed equalization curve sets unique to each Series I/II, III/IV or V/VI
Precise 901 equalization is performed digitally in an Analog Devices 400MHz SHARC DSP processor with 24 bit resolution
Two identical stereo pair outputs are available, allowing for dual active stereo systems (two stereo power amps) or the addition of an active subwoofer(s)
IR Remote with selectable tone mode settings:

Normal mode
Enhanced mode
Warm mode
Low frequency reduction mode

Ultra low distortion 2.0 Vrms output driver stage
Selectable input sensitivity of 2.0 Vrms or 4.0 Vrms

2. What’s Included

EQ901 Elite equalizer for BOSE 901 Series I/II, III/IV or V/VI (select your series when ordering)

Four precision engineered tone mode equalization curves

IR Remote Control for tone mode selection

External power supply

3. Typical Installation Examples

Analog audio input and output connections are made directly to the RCA input and output jacks. For RCA connections, #1 is Left (L) and #2 is Right (R). When making these connections, make sure to power off the equipment being connected.

3.1 Tape / Processor Loop Setup

3.2 Preamp / Power Amplifier Setup

This example shows a typical connection between a preamp and power amp.

If you have a receiver or integrated amplifier with a pre-out / main in loop, you can insert the EQ901B as shown below.

3.3 Active Subwoofer Setup

The two unused outputs connect to your subwoofer L and R line inputs. The subwoofer controls can then be adjusted to your preference.

3.4 Dual Stereo Power Amplifier Setup

4. Using the EQ901 Elite Remote Control

The IR remote control provided with the EQ901 controls the following runtime functions.

Mute. Mute and unmute audio output.
Volume. Reduce or increase the volume. Each press changes the volume in 0.5 dB. Holding down a button will accelerate volume change to 3 dB steps.
Preset (1 through 4). Switch to the selected tone mode. It takes a few seconds for the preset selection to complete.

5. 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.

6. Analog Input Level

The analog audio input levels are switchable between 2.0 Vrms and 4.0 Vrms to accommodate use with most equipment. The EQ901 Eite is shipped with the analog input level set to 2.0 Vrms. The only user-accessible jumpers are used to set the analog input sensitivity. The jumpers are located on the internal PC board near the RCA input jacks.

7. Support

30-day 100% satisfaction guarantee
Installation guide and phone support
One-year full replacement warranty (see below for specifics)
Deer Creek Audio is an authorized miniDSP dealer

8. Specifications

EQ901 Elite platform base: miniDSP 2x4 HD
Digital Signal Processor Engine: Analog Devices Fixed Point DSP SHARC ADSP-21489
Digital to Analog Converter (DAC): AK4626A
Internal Processing Resolution and Sample Rate: 32 bit / up to 192 kHz
Audio Input / Output Connectivity: Unbalanced Output, RCA
Input / Output Max Levels: In 2.0 Vrms / 4.0 Vrms (jumper-selectable), Out 2.0 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

9. 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. Return shipping is the responsibility of the customer.

Contact Deer Creek Audio

Please contact us with any questions or comments:

staff@deercreekaudio.com

720.726.9272