Audiopipe APSM-1300 Owner's Manual page 5

10 Low Pass Filter
Filter out high frequency that the woofer cannot play. Adjust this knob to match the
woofer's frequency response.
11 SUBSONIC
Filter out unwanted too low frequency. This function will increase the power handing
of your woofer's. It can adjust the frequency filter from, 10Hz (OFF) to 50Hz.
12 Bass boost Level
Adjust the boosted frequency from 0 ~ 12dB, APSM-1300/APSM-1500's boosted
frequency is is adjustable.
13 Bass boost Frequency
Adjust the boosted center frequency. The frequency can be adjusted from 30Hz to
80Hz, use combine with bass boost level adjusting.
14 Protect
Protection circuit indicator LED.
15 Power
Power indicator LED.
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