Martin Audio – MA1.3s Amplifier
ENGLISH
10
We recommend you to design the power distribution for at least the current at 1/8 power, and 1/3 power for heavy-
duty demands such as concert touring and industrial music etc.
The heat power can be calculated as follows:
If a headroom figure of at least 5dB (1/3 of full power) is used with a 4 ohms load on each output of the amplifier.
The 1/3 power per channel is then; 650 / 3 = 217watts, and the total output power = 2 x 217 = 433 watts.
The power consumption according to the chart above is then 1330watts.
The heat power produced is the difference between the power consumption and output power;
1120 - 433 = 687 watts total for the amplifier.
MA1.3s HEAT POWER
1/3 POWER 1/8 POWER 1/3 POWER 1/8 POWER 1/3 POWER 1/8 POWER
WATTS Kcal/hour BTU/hour
8 Ohm 397 313 340 270 1350 1070
4 Ohm 687 538 590 460 2340 1840
2 Ohm 1242 910 1070 780 4240 3110
1/3 Power level = Average power with music as programme source. The amplifier driven to clip level
1/8 Power level = Normal operating power with music as programme source, 9dB headroom
7 CONNECTIONS
7.1 Input connections
7.1.1 Balanced inputs
XLR Input connectors are active balanced and wired according to the IEC 268, that is pin 2 hot, and wired in the
following way:
PIN 1 GROUND/SHIELD
PIN 2 HOT (+)
PIN 3 COLD (-)
XLR input connector
XLR balanced
Within the Neutrik Combojack there is a _î(6.3mm) phone jack, which is wired in parallel with the XLR.
TIP HOT
RING COLD
SLEEVE SHIELD/GROUND
1
/4 TRS plug
ground
All material © 2007. Martin Audio Ltd. Subject to change without notice.
