Aurora Audio GTC2 User Manual

AURORA AUDIO INTERNATIONAL

1520 NORTH CAHUENGA BOULEVARD

HOLLYWOOD, CA90028

EMAIL: [e-mail] Telephone: [phone]

Web Site: http://www.auroraaudio.net Fax : [phone]

Aurora Audio GTC2 Dual Compressor

Owner's Manual

Table of contents :-

1. Introduction

2. Rear panel connections, audio and power connections

3. Front panel controls

4. Specifications

5. Tips for user

6. Warranty and ROHS directives

1. Introduction

Congratulations on your purchase of this hand-built, all class A circuitry, dual
compressor. It has been designed to be a very comprehensively equipped tool in the
quest for great sounding audio production.

Care has been taken to make the unit very easy to use with detented and color coded
control knobs/potentiometers, illuminated pushbuttons for all mode switching, and big,
illuminated, Sifam VU meters to provide indication of output level and gain reduction.

The unit is built in a robust, all steel, 19” x 2U case and has custom transformer floating
and balanced audio interfaces via XLR connectors. Each channel has its own fully
regulated, voltage, current and temperature protected, power supplies and low noise is

1

facilitated by the use of Mu-metal encased input transformers and a custom, low emf
radiation, toroidal ac power transformer.

The unit is designed to give years of reliable service.

2. Rear Panel Connections

Power is supplied via an industry standard IEC power connector.

The GTC2 power supply automatically senses the voltage of the ac current you connect
it to.

The fuse is a 1 amp anti-surge (slow blow) 20mm x 5mm. Anti-surge fuses must be used
due to the momentary inrush current to the toroidal power transformer.

The GTC2 MUST be connected to a grounded 3 pin power source.

Audio connections are made via 3 pin XLR connectors, wired pin 2 = hot, pin 3 = cold,
and pin 1 = ground.

In the center of the panel is a 1/4” T.R.S. Jack socket. This is the side chain linking
connector to enable the GTC2 to link to other GTC2 compressors and link their side
chains together for multi-channel compression.

Wiring of the connector is tip = Control dc, and sleeve = 0v (ground) common.

2

3. Front Panel Controls

The drawing above shows the left hand channel, the right channel is similar.

The five control potentiometers function as follows :-

NB There is one further small detent at either end of the pot rotation.

Threshold (Grey knob) :- A 17 detented potentiometer with a total range of 40dB, i.e
from -10dBu to +30dBu.

Ratio (Grey knob) :- A 17 detented potentiometer covering a range of ratios from 1.5:1
to 10:1.

Attack (Blue knob) :- A 17 detented potentiometer covering attack times from 500
microseconds to 5 milliseconds.

Release (Blue knob) :- A 17 detented potentiometer covering release times from 100
milliseconds to 3 seconds.

Gain (Red knob) :- A non-detented potentiometer covering gains from 0dB to +20dB.
The silk screened dB incremented scale is accurate and allows for fine level
adjustments.

3