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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 fre-
quency 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 LEVEL ADJUSTMENT
To reach a maximum in dynamic response from each individual head-unit/amplifier/speaker combi-
nation, 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 positions
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 at a low position, 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 HP and BP crossover frequencies on your amplifier, to obtain
the best sound quality of all loudspeakers connected to your car audio system.
EA 2-4-5 CH Manual (EDF).indd 16 01.03.2006 9:30:23 Uhr
16


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