Lanzar OPTIUTVA10B - Manual (Page 5)

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The switches and gain settings are located behind a watertight plug, which
also lights up when the amplifier is on. Be sure to replace the plug when
finished with adjustments
Controls, Input and Output Cables:
Don’t misuse the level control!
Do not mistake the input level control for a volume control! It is designed
ONLY to match the output level of your audio source to the input level of
your amplifier.
Do not adjust this input level of maximum unless your input level requires it.
Ignoring these instructions will result in an input overload to the amplifier,
and excessive audio distortion. It can also cause the protection circuit to
engage.
VOLUME CONTROL Plug for the waterproof remote volume control. When
installed, this control will turn off the Amp when turned all the
way down.