Martin Audio MA2.8, User Manual

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Martin Audio – MA2.8 Power Amplifier
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MAX OUTPUT POWER MAINS INPUT POWER
Power Full Power 1/3 Power 1/8 Power Idle
sine wave note 1 note 2
MA2.8 8 ohms 2X 1100 3100 1300 700 130
4 ohms 2X 1400 4300 1700 900 130
2 ohms 2X 1400 4700 1700 900 130
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 1400 watts per channel. The 1/8 power per channel is then;
1400 ÷ 8 = 175 watts, total output; 2 x 175 = 350 watts.
The power consumption according to the chart above is then 900 watts.
The heat power produced is the difference between the power
consumption and power output; 900 - 350 = 550 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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