EQ901B-V/VI User Guide

Introduction:


The Deer Creek Audio EQ901B-V/VI is a direct replacement for existing BOSE 901 Series V/VI equalizers. The EQ901B-V/VI features dual output EQ curves, Normal and Enhanced either of which will accommodate the 901 Series V or VI depending on personal preference.  See below for instructions on using this feature.

The EQ901B-V/VI installs in your tape monitor loop, pre-out/pre-in loop, or between your preamp and power amp. Switchable input levels between 0.9 Vrms and 2 Vrms accommodates use with most preamplifiers, amplifiers, or receivers. The EQ901B-V/VI is based on the miniDSP 2x4 digital signal processor.


Features:


  • Precision engineered 901 Series V/VI equalization curves

  • Dual output EQ curves Normal and Enhanced

  • Simple drop-in replacement

  • High fidelity and low noise

What’s Included:


  • EQ901B-V/VI Equalizer

  • Frequency equalization curves for 901 Series V/VI

  • Regulated power supply


Installation:


Analog audio input and output connections are made directly to the RCA input and output jacks. When making these connections, make sure that the equipment being connected is powered off.


Tape Monitor Loop Installation


                                 





Preamplifier / Power Amplifier Installation


The EQ901B-V/VI does not have a power switch. We recommend that it be left powered on, as power consumption is very low.  When you power the EQ901B-V/VI on and off, ensure that you turn the connected equipment off before disconnecting power from the EQ901B-V/VI, and also connect power to the EQ901B-V/VI before turning connected equipment on.



Setting Input Levels:


The analog audio input levels are switchable between 0.9 and 2 Vrms to accommodate use with most preamplifiers, amplifiers, or receivers.   If you are experiencing excessive signal level or distortion, you may need to switch the unit to the 2.0 Vrms setting


This EQ901B-V/VI is shipped with the input level set to 0.9 Vrms.

 

0.9 Vrms position - The maximum input signal voltage allowed before clipping the A/D converter is 0.9 Vrms. This position is typically used when the EQ901B-V/VI is connected between a preamp and a power amplifier.

2 Vrms position - The maximum input signal voltage allowed before clipping the A/D converter is 2 Vrms. This position is typically used when the EQ901B-V/VI is connected in a tape recording loop (REC/in to PB/out).

Accessing the Input Level Switches:



Using the Dual Output EQ Curves:


The EQ 901B-V/VI is equipped with two equalizer (EQ) curves, the Normal EQ curve is available on outputs 1 & 2, and the Enhanced EQ curve on outputs 3 & 4.

If you're using an amplifier or receiver with two tape monitor loops you can connect the EQ901B outputs 1 & 2 to tape playback inputs 1, and outputs 3 and 4 to tape playback inputs 2.  Then you will be able to switch easily between the two equalizer curves. If your configuration is a pre-amplifier out / main-amplifier in setup you'll need to manually move the cables from outputs 1 & 2 to outputs 3 & 4. Be sure to turn the power off all your equipment before you do this.






Specifications:


  • Distortion:  <1% THD at maximum input

  • Maximum input voltage: 2 Vrms or 0.9Vrms - jumper settable

  • Dynamic range:  un-weighted >98dB

  • Analog Devices ADAU1701 Digital Signal Processor Engine

  • Dimensions:  26h x 107w x 94d mm

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.

Please contact us with any questions you may have

deercreekaudio.com

info@deercreekaudio.com

720.726.9272