Precision Power A1000/2 - Manual (Page 17)

QBASS PLUS SPECIFICATIONS
Note: Not available on the model A500/2 amplifier.
QBASS PLUS TM
Up to 18dB of boost with selectable center frequency at 30Hz, 36Hz,
44Hz or 60Hz, with a Q-factor of 2.
Optional QBASS REMOTE TM
This boost control can be mounted in the dash and will supersede
the boost control on the amplifier endplate.
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