9-EN
SWITCH SETTINGS
When performing Switch Settings, remove the Top Cover. For details, see “REMOVING THE TOP COVER”
(page 3).
• Before switching each Selector Switch, turn off the power and insert a small screwdriver, etc.,
perpendicularly to the Switch.
Subsonic Filter (X-A90M/X-A90V 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.
Crossover Frequency Adjustment Knob
(LP FILTER) (X-A90M/X-A90V only)
Use this control to adjust the crossover
frequency between 50 to 400 Hz.
Bass EQ Adjustment Knob (X-A90M/X-A90V
only)
Add a 50 Hz bass boost up to +12 dB to tune
your bass response.
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