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5.4 SUBSONIC HIGHPASS CROSSOVER FREQUENCY ADJUSTMENT
When driving a subwoofer in bandpass (“BPF”) operation mode, you should also adjust the
subsonic highpass frequency. This is done by adjusting the “HPF” potentiometer. This setting
depends the size and the power handling of the installed subwoofer system. The higher the
subsonic crossover frequency is set, the higher the mechanical power handling of the connected
subwoofer system will be. The trade-off is reduced low end extension! The subsonic highpass
can not be bypassed, when the operation mode is set to BPF mode, but you can set the HPF
potentiometer at 10Hz, so the subsonic highpass filtering remains inaudible.
5.5 INPUT GAIN ADJUSTMENT
To reach a maximum in dynamic response from each individual head-unit/amplifier/speaker
combination, it is important to set the respective input level controls („GAIN“) of all channel pairs
correctly.
Before you start, you MUST set
all tone controls
(Bass, Mid, Treble, Loudness etc.)
and
the fader on the head-unit to their neutral or center positions.
Now turn all input gain controls of the installed amplifiers anti-clockwise to their minimum posi-
tions and start with the channel pair, that drives the subwoofer system. The lowpass level remote
control - if installed in your system configuration - should be set to approximately 3/4 open, so
there is enough headroom to turn up the bass volume later on.
➡
SUBWOOFER CHANNEL
Set the volume control of your head-unit to approximately 3/4 of full volume, while playing a
dynamic piece of music. Slowly increase the input gain control of the channel pair, that drives
the subwoofer(s), by turning the GAIN control clockwise until you can just about hear distorted
sounds coming out of your subwoofer system. Reduce the main volume level on your head-unit
to a medium listening level.
➡
SATELLITE CHANNELS
Slowly increase the input gain control of the channel pair, that drives the satellite system, by
turning the GAIN potentiometer clockwise, until you reach a good tonal balance with a slight
emphasis in the bass region. Aim at a full bodied bass response. Now slowly turn up the input
GAIN control of the remaining channel pair(s) - if any - until you reach a good tonal balance
between front and rear satellites.
➡
FINE TUNING OF ALL CROSSOVER FREQUENCY POINT SETTINGS
Finally you can attempt to fine-tune the high-pass and band-pass crossover frequencies on your
amplifier, to obtain the best sound quality of all loudspeakers connected to your car audio system.
