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4
Gain Control
If the sound level is too low, even when the volume of the car stereo used along with this
power amplifier is turned up, turn gain control clockwise. If the sound distorts when the vol-
ume is turned up, turn the gain control counter-clockwise.
• When using with an RCA equipped car stereo (standard output of 500 mV), set to the NORMAL
position. When using with an RCA equipped Pioneer car stereo with max. output of 4 V or more,
adjust level to match the car stereo output level.
• If you hear too much noise when using the speaker input terminals, turn the gain control
counter-clockwise.
LPF (Low-Pass Filter)/HPF (High-Pass Filter) Select Switch
Set the LPF/HPF select switch as follows according to the type of speaker that is connected
to the speaker output connector and the car stereo system:
LPF/HPF Select Audio frequency range Speaker Remarks
Switch to be output Type
LPF (Left) * — 40 Hz to 120 Hz Subwoofer Connect a subwoofer.
OFF (Center) Full range Full range
HPF (Right) * 40 Hz to 120 Hz — Full range Use if you want to cut the
very low frequency range*
because it is not necessary
for the speakers you are
using.
* See the “Cut Off Frequency Control” section.
Input Switch
It is possible to input from a car stereo external output (subwoofer output) or a car stereo
speaker output. When using an external output (subwoofer output), slide the switch to the
left. For connection instructions, see the “Connection Diagram” section. When using a
speaker output, slide the switch to the right. In this case, it is necessary to use the supplied
speaker input wire with RCA pin cord. For details, see the “Using the Speaker Input” sec-
tion.
