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allows all them to pass transient signals to the full output capability of the MA2.8S
without compression but to pull back to a suitable continuous power for sustained
signals such as rail-to-rail feedback.
Although the long-term limiter thresholds are lower for the mid and high frequency
sections (LF +5dBu, MF +1dBu, HF +1dBu), all W8LC sections are designed to
accept full MA2.8S power on transients...
W8LC section
Low frequency
Mid frequency
High frequency
How much mains power will I need?
Many touring systems are supplied with inadequate mains power causing the
system to sound like the PA equivalent of a portable radio with a flat battery!
Here are the current consumption figures for the recommended MA2.8S power
amplifier. When used with our standard crossover and limiter settings.
230Vac operation to DX1 limiter threshold, 2 W8LC sections per channel: 5A
115Vac operation to DX1 limiter threshold, 2 W8LC sections per channel: 10A
A rack with 9 MA2.8S amplifiers (each driving 2 W8LC sections per channel for a
total of 12 W8LC cabinets) will require a minimum of 45amps at 230Vac and
90amps at 1 15Vac under typical live sound conditions. We would recommend 63A
at 230Vac and 120A at 115Vac.
Here are the MINIMUM figures for typical racks:
Number of W8LC
Cabinets
4
8
12
16
* Large racks are often supplied with 3-phase mains - e.g. a 9-amplifier rack may
be wired with three MA2.8S amplifiers per phase and a 12-amplifier rack may be
wired with four MA2.8S amplifiers per phase. The above minimum current figures
may be divided by 3 when 3-phase mains is used.
How should I distribute mains power within the rack?
Normal distribution practice applies – e.g. a 230Vac inlet 63A inlet would be split into
2 x 32A spurs which would supply the appropriate outlet strips via 32A breakers.
Max continuous demand
760W
301W
301W
Number of
Minimum current
MA2.8S
for 230 Vac single
phase mains
amplifiers
3
6
9
12
All material © 2007. Martin Audio Ltd. Subject to change without notice.
Max transient demand
1500W
1500W
1500W
Minimum current
for 115Vac single
phase mains
15A
30A
45A*
90A*
60A*
120A*
30A
60A
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