Input Connections; Mic 1 And Mic 2; Mic 3 And Aux 1; Mic 4, Mic 5, Aux 2 And Aux 3 - ADS 3120 Plus Operation Manual

Input Connections

MIC 1 and MIC 2

Microphone inputs 1 and 2 use an XLR / ¼" 3-pole jack combination socket and a 180˚
5-pin DIN socket. Any of these connectors may be used. However if priority is required it
may be easier to use the DIN socket and compatible ADS Signet microphone. (See
Priority Connections 25 and 26 and wiring table on Page 8 for the DIN socket.)
XLR/Jack Combination Socket
The connections on an XLR plug are numbered 1 to 3 and should be connected as follows
Pin 1: Ground (or Screen).
If the signal source is not balanced then Pin 1 should be connected to Pin 3 along with the
Ground (or Screen).
Each of the microphone inputs 1 and 2 is provided with a trim control on the rear panel
(see diagram on Page 8). This control adjusts the sensitivity of the input to allow for a
wide range of input sources. Adjust this control to reduce noise and provide an acceptable,
undistorted output level.

MIC 3 and AUX 1

This microphone input uses an XLR / ¼" 3-pole jack combination socket (see above) and
is balanced. There are no priority functions available with this input. The input can be
reconfigured as an auxiliary input as follows

disconnect the power supply then remove the amplifier top cover

locate the correct switch on the rear PCB
(Three switches are located on the rear PCB. The switch required is the left
hand one when viewed from the front of the amplifier)

set the switch to the position nearest to the rear panel

replace the amplifier top cover.
The auxiliary input uses a phono connection (see below).

MIC 4, MIC 5, AUX 2 and AUX 3

Each microphone input uses a ¼" 3-pole jack connection (see below).
Each auxiliary input uses a phono connection (see above).
XLR Plug
Pin Configuration
Balanced
Pin 2: Signal+ (or Hot).
Page 9 of 16
Unbalanced
PIN 3: Signal- (or Cold)
Pin (Signal)
Sleeve (Screen)
Ring (Signal-)
Tip (Signal+)
Sleeve (Screen)