Martin Audio – MA1.3 Power Amplifier
E
NGLISH
8
MAX OUTPUT POWER
MAINS INPUT POWER
Power
Full Power
1/3 Power
1/8 Power
Idle
sine wave
note 1
note 2
MA1.3
8 ohms
2X
350
1300
700
400
140
4 ohms
2X
650
2300
1300
800
140
2 ohms
2X
900
3600
1900
1100
140
note 1 Average power with music as program
note 2 Normal music power with 9dB headroom,
source. The amplifier driven to clip level.
IEC standard power rating.
Table 1.
The current draw can be calculated by dividing the mains input power by
the mains voltage. We recommend that you design the power distribution
for at least the current at 1/8 power or 1/3 power for heavy duty demand
like discos etc.
The heat power can be calculated as the following example:
If we consider a headroom of at least 9dB and a 4 ohm load on an amplifier
producing 650 watts per channel. The 1/8 power per channel is then;
650 ÷ 8 = 81 watts, total output; 2 x 81 = 162 watts.
The power consumption according to the chart above is then 800 watts.
The heat power produced is the difference between the power
consumption and power output; 800 - 162 = 638 watts per amplifier.
5.6
Input connections
Both inputs are balanced on 3 pin XLR type connectors and wired pin 2
hot, pin 3 cold, pin 1 ground/shield:
PIN 1
-
SIG. GROUND/SHIELD
PIN 2
-
HOT (+)
PIN 3
-
COLD (-)
Figure 3. XLR input connector pin-out
1
2
3
SIG. GND.
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