LA Audio EQ231G User Manual

Dual 31 Band

Graphic Equaliser

Operation Manual

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1. Introduction

The EQ231G is a high quality dual 31 band 1/3 octave graphic equaliser.
The EQ231G also has a switchable 12dB per octave Hi-pass filter.
A delayed by-pass relay allows silent on/off switching and also provides direct

throughput when the unit is not powered.
Centre detent long stroke faders give up to 12dB of cut and boost at 31 ISO centre

frequencies, covering the entire audio spectrum (20 to 20KHz).
Inputs and outputs are electronically balanced.
Each channel has a Peak Indicator illuminating for an equivalent output signal of

+18dBu.

Options

The graphic equaliser section can be supplied with a hybrid combination of gyrators and
inductors, in order to maximise performance in terms of dynamics and signal-to-noise
ratio.

The unit can be augmented by parallel outputs offering a unique transformer distortion
cancellation circuit, this reduces distortion by an order of magnitude compared to
conventional designs.

2. Repairs and warranty

The EQ231G is a ruggedly constructed solid state unit which requires no preventative
or routine maintenance.

The unit is constructed from the highest quality components, which are selected so as
to be conservatively rated for maximum life. Each unit is soak-tested before despatch to
reduce the possibility of component failure in the field.

The LA Audio EQ231G has been manufactured to a high standard using quality
components. If correctly installed and operated the unit should give years of problem
free operation.

However in the event of a defect in material or workmanship causing failure of the unit
within one year of the date of original purchase we will agree to repair, or at our
discretion replace, any defective item without charge for labour or parts. To receive
service under this warranty it is necessary to return the unit to an LA Audio authorised

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service centre or to the factory with a dated receipt as proof of purchase. After repair
the unit will be returned to you free of charge.

Limitations:

This warranty does not cover damage resulting from accident or misuse. The warranty
is void unless repairs are carried out by an authorised service centre. The warranty is
void if the unit has been modified other than at the manufacturers instruction. The
warranty does not cover components which have a limited life, and which are expected
to be periodically replaced for optimal performance. We do not warrant that the unit shall
operate in any way other than as described in this manual.

3. Installation

It is important to read this section before applying power to the unit

3.1. Inspection and unpacking

The EQ231G is carefully packed at the factory in a carton which is designed to
withstand handling in transit.
However, if transit damage is evident, DO NOT discard any of the packaging material
and notify the carrier immediately, as it is he who is responsible for such claims.

The shipment should contain the following:
The Unit, EQ231G Graphic Equaliser
Power cord
Technical Manual (this book)

If any of the above items are missing, notify your supplier immediately.

3.2. Operating Environment

The unit is designed to operate between 0 and +50 degrees Celsius (32 - 122 F) in an
atmosphere of relative humidity up to 80%.
Should the unit be installed in an equipment rack, it is important to ensure that the
operating temperature inside the rack does not exceed the upper limit. This may be the
case where the rack contains power amplifiers and a cooling fan may be necessary in
such installations.

Although designed to withstand hum pick-up, it is VERY important that the unit is not
installed close to any strong electro-magnetic fields.

3.3. Power Requirements

The voltage is pre-selected at the factory for the country of destination.
Fuse rating EQ231G

(Note: Fuse must be Slow – Blow)
115-125 Volts AC 50/60Hz 200mA

200-250 Volts AC 50Hz 100mA
220 Volts AC 60Hz 100mA

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