ET120 & ET60 Installation & Maintenance Manual
Mains Connection
>3mm
3A
Main
Distribution
Board
>0.75mm
2
<2.5mm
2
Amplifier
Each amplifier requires a 3A spur, or a three-pin mains plug fitted with a 3A fuse, and wired as below:
Brown
Live (L) pin on the Plug and amplifier terminal block
Blue
Neutral (N) pin on the Plug and amplifier terminal block
Green/Yellow
Earth (E) pin on the Plug and amplifier terminal block
Microphone connections
Microphone cables must be run separately from the loop cable, under no circumstances should the
cables be tied together for any distance, this will cause magnetic feedback and the unit will not perform
correctly.
NOTE ! Only one of the two microphone inputs should be connected to ensure correct operation.
Unbalanced Microphone
The Unbalanced microphone input is presented on a mono 3.5mm Jack connection, and is designed to
accept most multimedia computer microphones directly, using the supplied connector. If this needs
extending we recommend extending it to no more than three metres, and using a right-angled
connecting plug.
Balanced Microphone
The balanced microphone input is presented on a three way two part screw terminal connection, and is
designed to accept the microphone cables directly.
The input provides a balanced 12V phantom supply to power electret type microphones such as the
ETCM/W and works with most professional microphones, unbalanced dynamic microphones should not
be used with loop systems as the will cause magnetic feedback problems.
Connection details
ET120/ET60 Pin
XLR connection
0V
Pin 1 Ground
-AU
Pin 3 Cold
+AU
Pin 2 Hot
Balanced Line Input
The balanced Line input is presented on a four way two part screw terminal connection, and is designed
to accept screened audio cables directly. The balanced line input can accept signals from –10dBV (tape
level) to +4dBV (professional mixing desk level).
The balanced line input also has an auxiliary 12V output electronically fused at 100mA to power ETOK
indicator plates or remote preamplifiers.
Connections
Do not use this input if the 100V line input is in use
.
ET120/ET60 Pin
Unbalanced XLR
Balanced XLR
ETOK
0V
Pin 1 Ground
Pin 1 Ground
Power -
-AU
Pin 3 link to 0V
Pin 3 Cold
+AU
Pin 2 Signal
Pin 2 Hot
+12V
Power
+
Document DCC ET12 7001-03 Rev 1 Aug 2005
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