ME-52 Expansion Amplifier
7
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PO Box 409 Hanover, MD
TEL (410) 761-4000 www.polyplanar.com
poly-planar
Marine Audio System
Switch & Gain Settings:
6) The switches and gain settings are secure behind a water resistant
rubber seal. Be sure to replace the cover when finished with
adjustments.
7) 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 speaker outputs or headphone or high level sources then
set the switch to the SPEAKER (in) position.
8) The POLARITY switch allows the user to optimize bass performance in
the case that there are more than 1 set of speakers producing bass in
the system. Play some music with strong bass content and listen with
the switch alternately in the NORMAL and REVERSE position until it can
be determined which setting results in more pleasing bass response. If
in doubt, or if any interaction with other speakers is unlikely, then leave
the switch in the NORMAL position.
9) The GAIN control adjusts the overall level of the amplifier. When using
the amplifier without volume control (as in Figure 4) the 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.
dB GAIN
LINE
SPEAKER
NORMAL
REVERSE
INPUT LEVEL
POLARITY
0
16
8
Figure 6
– Amplifier Switch and gain settings