If lighting is causing hum and/or buzz, power your amplifier from a
different AC mains ring that is not being used for stage facilities or
lighting
Hum and buzz can be generated in a stringed instrument where
there is no earth connection between output jack, strings or any tail
piece. A luthier might connect these parts using a wire
Acoustic buzzes on instruments may be confused with electrical
buzzes. To check the source or cause, unplug instrument and play it
hard acoustically
Excessive hiss will normally be produced by a faulty, poor quality, or
noisy device in the chain or by imbalances between different gear.
To reduce hiss, identify gear responsible and remove. Or play
harder and increase signal into it, while reducing its own gain and
increasing gain further on in any chain of devices
Turn off unused mixer channels. Radio interference within the signal
may be caused by the use of poor quality leads such as curly leads,
especially where high impedance and low output passive pickups
are used. To avoid, use highly screened jack leads into inputs or
use active pickups
Use only current government licensed, type approved, multi-channel
radio microphones and radio transmitters of good quality. We
recommend you use only western branded radio microphones
purchased in your territory and with valid guarantees. If noise or
broadcast radio interference is experienced, change for
P. 86
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