CONTENTS
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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.
GUIDES
ENGLISH
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
7.1Input connections
7.1.1Balanced 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 | ||||||||||||||||||||||
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ground
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 |
All material © 2007. Martin Audio Ltd. Subject to change without notice.
1/4 TRS plug
10
Martin Audio – MA1.3s Amplifier