Installation; Placement And Mounting; Connectable Signal Sources - audiophony GOA9C Manuel Utilisateur

3. INSTALLATION

3.1. Placement and mounting

The first thing to take into account when looking for the placement of the GOA9C is your comfort
and an easy access to all the connections.
The GOA9C has 19" (482.6 mm), 8U (355 mm) rack mounting ears that allow you to place it in a
standard rack.
Because of the high gain of the PHONO and MIC inputs, the mixer must be placed as far as
possible from noise sources (dimmers, engines, etc.) as well as from any mains cable. You should
never, under any circumstance, remove the metallic cover of the mixer.
The GOA9C, being a low consumption unit, does not need any cooling; you should anyway avoid
exposure to extreme temperatures and the operating environment must be as dry and dust free as
possible.
The GOA9C operates under voltages between 90 and 264 V at 47 to 63 Hz.
In order to protect the mixer from eventual mains overloads, it has a time-lag 0.5 A (60) mains
protection fuse. Should this fuse ever blow off, disconnect the mixer from mains and replace it with an
identical one. NEVER REPLACE THE FUSE WITH ANOTHER ONE WITH A HIGHER VALUE.
ATTENTION: Changing the fuse must be performed by qualified technical personnel.

3.2. Connectable Signal Sources

- Turntables / Phono: They must be fitted with a magnetic cartridge with nominal output level
between -60dBV and -20dBV (1 to 100 mV). The PHONO (46) inputs of the GOA9C have a high
headroom (margin before saturation) and it can handle higher output cartridges than what is usual.
These inputs are supplied with a nominal input sensitivity of -40dBV (10mV).
- Microphones: The MIC inputs (43) are ready for a nominal input level of -50dBV (3.16 mV) and
are equipped with XLR 3 connectors. These inputs provide, through the input selector (1) at ATT
position, an input sensitivity reduction of 20dB; this is, from -50 to -30dBV (3.16 to 31.6mV). The
connection of balanced signals is as follows:
Hot or direct signal
Cold or inverted signal
Ground
Low impedance (200 to 600Ω) monophonic microphones must be used. In case of working with
an unbalanced connection Pin 1 and Pin 3 must be short-circuited.
The GOA9C features a Phantom power supply for the connection of condenser microphones. A
switch for general activation of the phantom power can be found on the front panel of the unit (15).
However, a set of internal jumpers allow you to inhibit the phantom power for individual microphone
inputs. The default setting of these jumpers on the GOA9C is "Phantom ON". See configuration diagram.
- LINE Inputs. Given the important level differences between usual LINE and CD sources (e.g.
Tape decks), the GOA9C provides specialized inputs for each source. The sensitivity of the 0dBV LINE
input (45) is 0dBV (1V), while the –10dBV LINE (44) sensitivity is -10dBV (316mV).
> Pin 2
> Pin 3
> Pin 1
5