A Note About The Input And Output Jacks; Ground Loops - ENSONIQ DP/4+ Reference Manual

Section 1 — Controls & Basic Functions

A Note About the Input and Output Jacks

Use standard balanced (TRS stereo cables) or unbalanced (TS mono cables) for these connections.
If there is a problem with hum or buzz, see the following section on ground loops.
TRS Bal/Unbal
Inputs & Outputs
As the labels on the Input and Output jacks indicate, the DP/4+ employs extensive automatic
switching on each stereo pair of inputs and outputs. That is:
• Normally, Inputs 1 and 2, and Inputs 3 and 4 are treated as stereo inputs. However, if
nothing is plugged into 2 or 4, Inputs 1 and 3 will work as mono inputs and will also provide
signal to Inputs 2 and 4 respectively.
Note: In some cases, you may not want to have the mono signal plugged into Inputs
1 and/or 3 sent to Inputs 2 and/or 4. To send a discrete mono signal to Input 1 and/or
3, connect a "dummy" cable into the Input 2 and/or 4 jack (a dummy cable is just a
standard balanced/unbalanced cable that is not connected to any external device).
• Similarly, Outputs 1 and 2, and Outputs 3 and 4 are normally stereo outputs. If nothing is
plugged into Outputs 2 or 4, however, the stereo signal will be summed to mono and sent to
Outputs 1 and 3 respectively.
• If nothing is plugged into Output 3, the stereo signals from outputs 3 and 4 will be summed
with the stereo signal from outputs 1 and 2 before the automatic switching circuit described
above.
Note: In some studio applications (such as when using a patch bay), you may want to
have outputs 3 and 4 connected, and still have the stereo signals from outputs 3 and 4
summed with the stereo signal from outputs 1 and 2. There is a parameter in
System•MIDI mode that allows you to accomplish this (parameter #60, Mix Output 3/4
onto 1/2). See Section 4 — System•MIDI for more information about this parameter.
8
Outputs
4 3 2 1
mono mono
main
R L R L
Output Jacks
Inputs
Level (dBu)
4 3
mono
+4
-10
R L R
Input Jacks
ENSONIQ DP/4+ Reference Manual
2 1
mono
Front panel
Mic Gain
button
disables
rear Input 1
L