12—Supplemental Information
10 ENSONIQ DP/Pro Reference Manual
A bout Gr oun d Loops
The DP/Pro has ground compensated outputs, which offer the advantages of balanced outputs (which
provide minimized hum and interference), plus the advantage of a transformer isolated output—the
ouput connector “grounds” are not hooked directly to the DP/Pro ground, thus eliminating the
possibility of a ground loop. This means that you can use balanced or unbalanced equipment with the
DP/Pro, and you won’t have any ground loop problems on the outputs.
Ground loops are only possible on the inputs, depending on what equipment you’re using with the
DP/Pro. If you find that you do have a ground loop problem, you can eliminate it in one of two ways:
• by using an audio isolation transformer. Many of these devices have a switch that can either
connect or disconnect the grounds (a ground lift switch). As long as the two grounds don’t
connect, you can avoid input ground loops.
• by modifying the cables you’re using to connect to the DP/Pro’s inputs.
Modifying Cables to Eliminate Input Ground Loops
If you’re connecting to the DP/Pro’s 1/4” inputs, you may be using either 1/4” unbalanced cables,
1/4” balanced cables, or XLR to 1/4” balanced cables. (If you’re connecting to the DP/Pro’s XLR
inputs, you won’t have any input ground loops.) Use the diagrams below to determine which kind of
cable you’re using and make the appropriate modifications.
• If you’re using balanced 1/4” cables, disconnect the shield from the connector that’s plugged into
output of the source device.
Red
Shield
Black
T
R
S
T
R
S
OTHER 1/4" Balanced Output ENSONIQ 1/4" Balanced Input
Red
Shield
Black
T
R
T
R
S
OTHER 1/4" Balanced Output ENSONIQ 1/4" Balanced Input
(unconnected)
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