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SWITCH SETTINGS
• Before switching each Selector Switch, turn off the power and insert a small screwdriver, etc.,
perpendicularly to the Switch.
• To use the top inner panel, remove the top cover. See "REMOVING THE TOP COVER" (page 3).
Subsonic Filter (HDA-M80/HDA-V90 only)
The subsonic filter for cutting ultra low
frequencies from the input signal before being
amplified.
This is desirable for several reasons:
– To protect speakers too small or not capable
of reproducing ultra low frequencies.
– To minimize power wasted from reproducing
inaudible sound.
– To protect subwoofers in vented enclosures
from over excursion below the tuning
frequency.
8
-EN
Crossover Frequency Adjustment Knob
(LP FILTER) (HDA-M80/HDA-V90 only)
Use this control to adjust the crossover
frequency between 50 to 400 Hz.
Bass EQ Adjustment Knob (HDA-M80/
HDA-V90 only)
Add a 50 Hz bass boost up to +12 dB to tune
your bass response.
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