Specifications

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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 Max continuous demand Max transient demand

Low frequency 760W 1500W

Mid frequency 301W 1500W

High frequency 301W 1500W

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:

Mini

mum current

Minimum current

Number of W8LC

Cabinets

Number of

MA2.8S

amplifiers

for 230 Vac single

phase mains

for 115Vac single

phase mains

4 3 15A 30A

8 6 30A 60A

12 9 45A* 90A*

16 12 60A* 120A*

* 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.