Gain or level settings
Gain switches
If you are lucky enough to have amplifiers with user gain switches, set them all to
identical positions. A voltage gain in the range 23-33dB will provide a good balance
of system headroom and noise (assuming professional audio equipment is in use
FOH).
Level controls
The front panel level controls should be turned down (fully counter clockwise) until
FOH-to-Amp rack lines have been checked and controllers have been set to suit the
power amplifiers to be used (see Section A1.5.2). Music should be used to check that
controllers are receiving and sending the appropriate signal bands and then each
power amplifier level control advanced in sequence to check system operation and
patching.
Assuming that controller output levels and limiters have been set as tabulated in
Section A1.5.2, power amplifier level controls should be set to full (fully clockwise)
for loudspeaker sections requiring the strongest drive. Amplifiers driving nearer-field
sections within the same cluster may be backed off as required for smooth coverage.
This process will ensure that the system remains balanced during limiting.
Rack mounting
Always leave a 1U space between power amplifiers and controllers. Although most
modern amplifiers don’t radiate significant fields it’s better to play safe and keep the
system quiet. Rear supports are recommended - check with the manufacturer.
A1.6.1 Martin Audio MA2.8 Overview
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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