PolyPlanar ME-60 - Manual (Page 7)

ME-60 Expansion Amplifier 7
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PO Box 409 Hanover, MD TEL (410) 761-4000 www.polyplanar.com
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Marine Audio Systems
Switch & Gain Settings:
7) The switches and gain settings are secure behind a water resistant rubber
seal. Be sure to replace the cover when finished with adjustments.
8) The INPUT LEVEL switch selects the input sensitivity of the amplifier. If
you are connecting to a LINE level source (typically any RCA type
connection) then the switch should be in the LINE (out) position. When
connecting to loudspeaker outputs or headphone or high level sources
then set the switch to the SPEAKER (in) position.
9) The low Pass Filter switch allows the user to optimize bass performance
in the case a subwoofer is connected to channels 3 and 4. Poly-Planar
recommends use of the Poly-Planar MS55 compact box subwoofer for
excellent bass response.
10) The GAIN control adjusts the overall level of the amplifier. The Bass Gain
Trim adjusts the bass level output of channels 3 and 4 when the LPF
switch is depressed. When using the amplifier without volume control (as
in Figure 4) the Gain level should be set to achieve a balance with other
loudspeakers in the system. As a rule, keep the gain setting as low as
possible while still insuring that the system will reach full output power.
When using the system with external volume control (as in Figure 5), set
the external Volume Control to FULL (clockwise) and adjust the gain on
the amplifier until full output power is reached. Full output power level can
be determined by turning the gain control clockwise until the apparent
loudness does not appear to increase any more. Leave the control at the
setting where this begins to become apparent.
Figure 6 – Amplifier Switch and gain settings