Eliminating Hum And Buzz - Radial Engineering STAGEDIRECT User Manual

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ELIMINATING HUM AND BUZZ

Solving noise problems on stage is a never ending battle! The StageDirect
has been designed to minimize noise by incorporating a dual purpose
ground lift switch that isolates the audio signal ground in a specifi c way,
depending on which power source is being used.
Lifting the signal ground usually helps to reduce the hum and buzz caused
by ground loops. When using the 15VDC supply, lifting the ground results
in a true 100% ground lift by disconnecting pin-1 on the XLR output. When
using phantom power, lifting the pin-1 ground also disconnects the 48V
DC supply. As such, when powered by 48V phantom, the StageDirect
employs a quasi ground lift scheme that provides a virtual ground lift,
while still enabling phantom power to pass.
If noise is encountered coming from the XLR output and heard through
the PA system, simply depress the recessed ground lift switch using a
small screwdriver.
To further reduce the opportunity for noise to pollute the audio system,
the hi-Z ¼" stage amp output is transformer isolated. This helps eliminate
hum and buzz caused by ground loops.
Radial Engineering Ltd.
Recessed ground lift switch for the XLR
output located on the rear panel.
10
True to the Music
The transformer isolates
the output going to your
stage amp.
StageDirect™ Active Direct Box