ENSONIQ DP/2 User's Guide Page 134

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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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