9
MULTICHANNEL POWER AMPLIFIER V1.1 web
short circuit. The following list shows the maximum average current requirement of the different
models of power amplifiers at normal music operation:
MODEL
MÁXIMUM CURRENT REQUIREMENT
MA80.4 2A.
MA80.8 4A.
MA150.4 6A.
MA150.8 8A.
Make sure that the power amplifier power switch is at position 0 (turned off).
Insert the male connector of the three-wire cable into the mains plug.
Turn on the power amplifier power switch. Right now, the power amplifier will turn on.
CAUTION:
Make sure that the mains voltage is the correct, as well as their fuse is the adequate.
INPUT CONNECTION
The input signal to the power amplifier is made by 8 (4 ) IN Xlr-3-31 female connectors and 8
(4) Jacks 1/4 connectors, both in parallel (XLR with Jack), one XLR and Jack for each channel input.
The inputs are balanced, with a nominal impedance of 20 K
Ω
(10 K
Ω
unbalanced), the positive
corresponds to pin 2, and the negative to pin 3 and pin 1 is ground. The following table shows the
correspondence of inputs pins:
INPUT CONECTOR XLR-3-31
PIN 1
GND
PIN2 HOT
(+)
PIN3 COLD
(-)
PRECAUTION:
If you are a user of another old ALTAIR amplifier series having your equipment with PIN
3+, you must change your wiring configuration externally to avoid phase problems.
The input connection depends on two factors, the first is the type of input signal balanced or
unbalanced, and the second the ground configuration of the sound source (floating or ground-
referenced). The next pictures show some of the different possibilities of connection, relying on the
