Audiovox PA-S250 - Manual (Page 13)

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3
Filter Selector
This switch allows selection of the frequency filters that permit the amplifier to be used to reproduce the entire audio
range, just the bass, or all frequencies above the bass range.
In the "OFF" position of the switch, the response is flat and unaffected so the entire audio frequency range is
reproduced by the amplifier. Use this setting if the amplifier is being used to power a full range speaker system.
In the "LOW PASS" setting, only the bass frequencies below the frequency set by the Crossover Frequency Control
will be amplified and fed to the speakers. Use this setting if the amplifier is being used to power a sub-woofer speaker
system.
In the "HI-PASS" setting, only the frequencies above the frequency set by the Crossover Frequency Control will be
amplified and fed to the speakers. Use this setting if the amplifier is being used to power the full-range speakers in
a system that also has separate sub-woofer(s).
4
Crossover Frequency Control
This Control selects the crossover frequency when the Filter Selector is in the "LOW-PASS" or "HI-PASS" settings.
Adjust it to the appropriate position for the characteristics and crossover frequency requirements of the speaker
system with which the amplifier is being used.
5
Bass Boost Switch
This switch is used to accentuate the bass frequencies by adding 8 dB of boost to the signal (at 45 Hz.).
6
Fuse
The circuitry of the amplifier is protected from damage by an automotive-type fast-blow fuse. If fuse replacement is
necessary, use only fuses of the same ampere rating as originally supplied with the unit. The use of fuses with
incorrect ratings may cause serious damage to the amplifier. If fuses blow consistently, carefully check all electrical
connections to the unit.