Matrix 4 I
NSTALLATION AND OPERATION MANUAL
3
For balanced microphones, connect the cable screen to pin 1, the in-phase signal (+) to pin 2
and the reverse phase signal (-) to pin 3.
For unbalanced microphones, connect a wire link from pin 1 to pin 3 inside the XLR type
cable mounted plug; use pin 1 as ground (cable screen) and pin 2 as hot.
Phantom power facilities are provided; any one of the four inputs can be configured to
operate with 15V phantom power by positioning the relevant jumper as detailed below:
Phantom Power Jumper Locations
MIC 1 PHANTOM POWER
MIC 2 PHANTOM POWER
MIC 3 PHANTOM POWER
MIC 4 PHANTOM POWER
PAGING MIC PHANTOM
POWER
OFF
ON
MIC 1
INPUT
MIC 2
INPUT
MIC 3
INPUT
MIC 4
INPUT
PAGING
MIC
INPUT
When setting the jumpers please ensure that you:
•
Remove the mains cable from the rear of the product before removing the top panel.
•
Only reassemble the unit using screws identical to the original parts.
•
Only use a microphone that requires phantom power.
6 Microphone
Sensitivity
The microphone amplifier has a fixed gain of 40dB with an additional post level control gain
of 20dB. The total gain of 60dB is adequate for all speech applications and maintains a high
overload margin, however, it is important to operate the unit with the mic level control
positioned at or above the 12 o’clock position.
If the microphone signal is derived from a line level device such as a radio microphone the
input amplifier can be configured to operate with a gain of 0dB (+20dB overall gain); by
configuring the relevant PCB mounted jumper. The Jumpers are marked as J1,J2,J3&J4
and are associated with the microphone inputs as follows:
J1
= Mic Input 1
J2
= Mic Input 2
J3
= Mic Input 3
J4
= Mic Input 4
A diagram showing the location of J1,2,3&4 can be found on the following page.
16/12/02 V6.0
