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AMH PROFESSIONAL AUDIO POWER AMPLIFIER INSTALLATION AND OPERATION MANUAL
CONTROLS, CONNECTORS & INDICATORS
REAR PANEL
8
Mains Input Connector
The AMH2400 is fitted with a standard 3 pin IEC 60320-C14 socket.
The AMH3600 is fitted with a high current 3 pin IEC 60320-C20 socket.
Use the mains cable supplied with the unit to power up the unit.
NOTE:
Your unit must always be earthed!
IMPORTANT:
The AMH3600 is a high current 16A mains inlet and
does NOT accept standard IEC60320-C13 power cords.
9
Mains Circuit Breaker
The amplifier is fitted with a resettable circuit breaker. If the circuit breaker
trips, allow 3 minutes for the contacts to reset thermally before pushing the
reset button to reset it mechanically.
10
Binding Post Outputs
Touch proof binding posts (banana jacks) are provided for speaker output
termination with banana plugs or bare wire. The red post is used as positive
and the black post is used as negative. For bridge connection, use only the
red posts.
11
Speaker Output Connector
A 4 pole Neutrik speakON connector is provided as an additional speaker
output. This standard of loudspeaker-amplifier connection allows access to
both channels of the amplifier via the one connector for biamp applications.
Channel 1 is considered the dominant channel and has both channels wired
to the speaker connector. See the installation section of this manual for
detailed information on speaker connector wiring.
12
Balanced Input
A female 3-pin XLR type connector is provided on each input:
Pin 1 = Signal Ground;
Pin 2 = Hot (non-inverting or in phase);
Pin 3 = Cold (inverting or reverse phase).
13
Signal Strapping
A male 3-pin XLR type connector is provided and wired in parallel with the
female input XLR for strapping / looping signal between amplifiers.
14
Bridge / Stereo / Mono (parallel)
Keeping this switch in middle position engages the BRIDGED/ MONO mode of
operation. In this mode your amplifier will only accept signal applied to channel
1’s input XLRs and the level of both channels will be controlled by the channel
1 attenuator. The output from channel 2 will automatically be of the opposite
polarity (reversed phase) and speaker termination should be sourced from the
red binding-post outputs.
Alternatively, the speaker could be connected to poles 1+ & 2+ of the 4 pole
speaker connector (See Installation Output Wiring on Page 7). Keeping this
switch in bottom position will run the amplifier in stereo mode. Keeping this
switch in top most position will run the amplifier in mono (parallel) mode. In
this case also CH 1 level control will control both the channels.
15
Limiter Switch
Adjust the switch to the ON position to engage the clip limiter circuitry. The
threshold level is referenced to the supply rail and the output voltage is
sampled allowing true clip detection and limiting.
16
Signal Ground Lift Switch
Adjust the switch to the ON position to disconnect signal ground from the input
connectors on both channels. It is intended to be used when “hum” is caused by
earth loops (due to different ground potentials between source equipment and
the amplifier) or stray magnetic field pick up on the input ground/shield wiring.
(It does not interrupt signal ground continuity on the strapping connector). The
amplifier should be turned off before engaging this switch!
17
Filter Switch
Individual channel selectable low pass filter (LPF) or high pass filter (HPF).
The filter is a Linkwitz-Riley operating at 120Hz with a 12dB/octave attenuation.
8
14 16
13
12
9
10
11
15
17
Rear panel for AMH3600 shown. Rear panel controls, connectors & indicators are the same for AMH2400.
