Gain and level settings, Amplifier load tolerance

overpowered models - with suitably set controller limiters - without risking uncontrolled power bursts. The MA series power amplifiers’ regulated power rails also ensure maximum performance under the real-world concert conditions of less-than-optimum mains supplies and low impedance loads.

Amplifier load tolerance

An efficient subwoofer system in live concert conditions can act as a surprisingly dynamic and complex load. Most modern touring power amplifiers claim 2 Ohm capabilities but make sure your amplifier is also capable of driving reactive (ie inductive or capacitive) loads without prematurely clipping or developing output stage crossover distortion.

Mains safety!

A fully qualified technican should check mains safety and phase voltage before the system is patched.

Power reserve

Most power amplifier specifications are based on bench measurements made using stable, high current mains supplies and well defined loads. Amplifiers sound best when they have plenty of current in reserve for percussive peaks and sustained bass notes.

1)Try to ensure that the mains supply stays within the amplifier manufacturer’s specified range from no load to maximum load.

An electrical technician should check the supply vs demand using an accurate voltage meter.

2)If unfamiliar generators are being used the electrical technician should check the mains waveform (using a portable ’scope-meter) to make sure that it is sinusoidal and not crawling with spikes or interference.

3)Avoid driving too many WLXs in parallel. I would suggest no more than two (giving 4 ohms) so that the power amplifier’s 2 Ohm spec is kept in reserve for musical peaks.

4)Avoid using power amplifiers in bridged mode. Most commercial power amplifiers are optimised for 2-channel operation. It is usually better to use the appropriate amplifier in 2-channel mode than to use an inadequate amplifier in bridged mode.