Pioneer GM-D505, Owner'S Manual

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Power Indicator
The power indicator lights when the
power is switched on.
HPF (High-Pass Filter) Select Switch (CH A and CH B)
Set the HPF select switch as follows according to the type of speaker that is connected to the
speaker output connector and the car stereo system:
HPF Select Audio frequency range Speaker Remarks
Switch to be output Type
OFF (Left) Full range Full range
HPF (Right) Low Frequency range to Full range Use if you want to cut the
High Frequency range very low frequency range
because it is not necessary
for the speakers you are
using.