StereoStone Proficient 180W M3 Subwoofer Amplifier

Designed to power 1 StereoStone Sub Rock or 2 StereoStone Gibralter Subs, or any passive subwoofer with a maximum 250 watt input. The amplifier’s Auto Sense mode allows it to turn on or off in response to audio signals from the receiver or preamp, which are received via its input connections.

NOTE: It is essential that a minimum of 14-gauge speaker wire be used. CAUTION: Only make connections when the amplifier is turned off.

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.

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.

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.

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.

Plug the three-prong plug directly into a 120V AC 60Hz wall outlet.