The power indicator lights when the
power is switched on.
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
Audio frequency range
to be output
Very Low Frequency range
Low Frequency range to
High Frequency range
BFC (Beat Frequency Control) Switch
If you hear a beat while listening to an
MW/LW broadcast with your car stereo,
change the BFC switch using a small
standard tip screwdriver.
Connect a subwoofer.
Use if you want to cut the
very low frequency range
because it is not necessary
for the speakers you are