Radial Engineering Ltd.
StageDirect™ Active Direct Box
True to the Music
®
10
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 ground lift switch
that disconnects 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 after connecting the XLR, simply depress the
recessed ground lift switch using a small screwdriver.
recessed ground lift switch for the XLr
output located on the rear panel.
To further reduce the opportunity for noise to pollute the audio system,
the hi-Z ¼” stage amp output is equipped with a transformer. Isolating the
stage amp from the StageDirect and PA helps eliminate hum and buzz
caused by ground loops.
The transformer isolates
the output going to your
stage amp.
