Aurora Audio Absolute GTM822 User manual

AURORA AUDIO INTERNATIONAL
1518 NORTH CAHUENGA BOULEVARD
HOLLYWOOD, CA90028
EMAIL: Info@ uror udio.net Telephone: [phone]
Web Site: http://www. uror udio.net F x : 323 462 6137
GT8 x 8 Instruction Sheet
Introduction:
Well done for purchasing a hand-built, eight channel, eight bus Absolute line mixer. The Absolute line of
small mixers differs from our normal Class A discrete transistor products because we don't want these mixers
to add any artifacts to the sound of the GT 822. We want the sound to be as pure as possible... hence the
term Absolute.
Unpacking Instructions:
Carefully remove the unit from the custom foam packing. The power supply works from any ac voltage from
85 volts to 240 volts, 50 and 60Hz.
Operating Guide:
All channels and bus output connections are via TRS 1/4” jack sockets. There are also two unity gain 25 pin
D-Sub connectors, one for the bus outputs and the other a direct input to the eight mix busses. These
connectors are used when cascading two or more 8 x 8 Absolute line mixers together.
There are two inputs per channel marked “PRE INPUT” and “POST INPUT”. The PRE INPUT normally
wires to the GT 822's channel pre-fade insertion send jack and the PRE RETURN jack is in parallel with
the PRE INPUT jack and intended as a loop through to a patch bay so that the GT 822's insertion path is
retained. The POST INPUT is wired to the GT 822 channel output XLR.
The PRE/POST switch on the front panel selects either of the inputs although, obviously, they could be used
with any two sources and not necessarily the GT 822. The unit was designed to enhance the features of the
GT 822 but could also be used as a stand-alone device.

The red channel input level potentiometer has 10dB gain at fully clockwise to accommodate low input levels.
There are 8 bus assign button arranged to two columns with odd numbered busses on the left and even
numbered busses on the right. A pan-pot is selectable by pressing the “STEREO” button which enables the
signal to be panned between the left and right column busses.
At the top of the unit are the eight, blue, output bus level potentiometers. These are unity gain (0dB) when at
fully clockwise.
The GT8 x 8 Absolute has a wide number of uses and applications. It was designed originally to provide the
GT 822 with eight more mix busses for effects sends, etc. As it has the option for pre-fade inputs and stereo
panning, it could also be used as an eight input, four stereo output, cue headphone mixer.
The GT8 x 8 Absolute can be expanded to 16, 24 or 32 channels by means of cascading the 25 pin D-Sub
connectors and the inputs could also be linked to provide 16, 24 or 32 busses. It is a very flexible mix system!
Specifications:-
Channels:
•Gain = +10dB
•Input Impedance = 18Kohms (electronically balanced)
•Common ode Rejection Ratio = 50dB @ 60Hz
•Slew Rate = 12 volts per microseconds
•Input Headroom = > 26dB
Outputs:
•Gain = 0dB
•Output Impedance = 50 ohms (electronically balanced)
•Common ode Rejection Ratio = 65dB @ 1KHz
•Frequency Response = 20Hz to 20KHz + 0.5dB
•Noise = < -75dBu (Weighted 20Hz to 20KHz)
•Crosstalk = < -65dB @ 1KHz
•Headroom = > 26dB
Power Suppl :
•Input Voltage = 85v to 250v ac, 50/60Hz
•Power = < 20 watts
Warrant : ONE YEAR PARTS AND LABOR LI ITED WARRANTY
Aurora Audio International warrants this Absolute unit against defects in workmanship for a period of one
year and parts for a period of one year from receipt by the original end user. This warranty shall not apply to
damage resulting from misuse including water damage, in-transit damage, fire damage, improper
maintenance, dropping the unit and operation or storage outside the environmental specification for the
product.
Do not try to repair this Absolute. There are no user serviceable components inside.
Only qualified Aurora Audio International technicians are authorized to repair this unit.
WARRANTY VOID IF CASE IS OPENED
Aurora Audio, 1518 North Cahuenga Boulevard, Holl wood CA90028
Phone [phone] Fax [phone]
Email [e-mail] Web URL www.auroraaudio.net