Operation Manual

5.4 SUBSONIC/HIGH PASS 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)_2008.indd 13 25.02.2008 17:29:52 Uhr