20.4 INTERFERENCE & NOISE: HUM, BUZZ, HISS, RADIO?
Keep your EDB-2 VAP and signal cables away from devices with
strong magneticfields, or mobile/cellular phones. These include
large AC mains transformers, generators, lighting control systems,
refrigeration, air conditioning and non earthed fluorescent lighting
Switch off equipment which is causing interference
Keep signal cables away from mains and speaker leads
Check mains power leads are not coiled
Use highly screened microphone or instrument leads, with metal
shielded connectors and good connections
Shorten or uncoil cable runs
Unplug power supply and try using batteries - Use correct Headway
Power Supply Unit
When using the XLR to jack adaptor for a D.I output, set the
Earth/Gnd Lift switch to cut earth loop hums if required. Otherwise
leave Earth Lift switch Off
Use Notch Filter with narrow "Q" to hone in on troublesome hum
and cut it (at around 50-60Hz) or cut fluorescent light buzz (at
around 100-130 Hz)
Use mains filters to prevent noise transmitting through mains power,
which can affect amplifiers
P. 85
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