Connecting the Audio Inputs
CAUTION
: Only make connections when the amplifier is turned off.
• Line-Level Inputs (Left/Right):
The line outputs from a preamplifier or receiver can be connected to the line-level inputs of the
M3 amplifier using RCA cables. If the system has just one subwoofer output, simply plug it into either the left or right line inputs.
Using these inputs will cross over the audio signals sent to the line outputs at a fixed high pass of 75Hz.
• LFE (Low-Frequency Effects) Input:
If the preamplifier or receiver has an LFE output, you can connect it that way. However, the
LFE input effectively bypasses the amplifier’s low-frequency adjustable (low-pass) crossover. The Low-Pass crossover function will
be handled by the preamplifier or receiver.
• Speaker-Level Inputs (Left/Right):
These inputs can be used if the preamplifier or receiver does not have a subwoofer output
or set of line output jacks. Connect the left/right pair of main-speaker output wires from the main amplifier or receiver to the
speaker-level input connectors on the M3 amplifier. Then connect a left/right pair of speaker wires from the M3 speaker output
connectors to the main speakers.
Connecting the Audio Outputs
• Line-Level Outputs (Left/Right):
Sources connected to the line-level inputs can be forwarded to other receivers or amplifiers
line-level inputs. This allows a second component to make use of the signal as it’s passed on. Connect RCA cables to the line-level
output sections of the M3 and the line-level inputs of a receiver or amplifier.
Note:
The M3’s high-pass crossover will be in effect,
removing the audio below 75Hz to the connected component.
• Speaker-Level Outputs (Left/Right):
Connect a left/right pair of speaker wires from the M3 speaker output connectors to your
main speakers. This method will filter out the frequencies below 75Hz and send them to the subwoofer. The frequencies above
75Hz will be sent to the main speakers. The system’s primary amplifier or receiver will still power the main speakers.
Connecting the AC Power
Plug the three-prong plug directly into a 120V AC 60Hz wall outlet.
Protective Circuitry
If the amplifier’s protective circuit is activated, it indicates one of the following situations:
• The amplifier has detected that the subwoofer is in danger of overheating and has temporarily shut down to protect the woofer.
The amplifier will return to active status without user intervention.
• There is a fault in the wiring, speaker or amplifier. If the amplifier remains off, turn the power button off and then on again. If the
amplifier returns to the protective mode, turn the amplifier off and refer to the “Troubleshooting” section of this manual.
3
Diagram 1
Rear Panel of M3 Amplifier
Speaker Outputs
Speaker Inputs
Line Inputs
Line
Outputs
LFE Input
Low Pass
Crossover
Control
Bass Boost
Control
Volume
Limit Control
Subwoofers
Outputs
IEC Connector
Fuse
Power Switch
Phase Switch
Serial Number
Voltage Selector Switch
