EMPHASER EA1350D, Installation & Operating Manual

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5. CrossoVer adJustMents
5.1 LOWPASS CROSSOVER FREQuENCY ADJuSTMENT
Note: Before you attempt to adjust the lowpass crossover frequency, you must set the subsonic highpass
filter to its lowest position (10 Hz).
The LOWPASS cut-off frequency setting depends on some variables. As a rule of thumb, settings in
a range between 60 to 90 Hz will render best sonic results. If you use this amp for SPL scores, it is
advisable to set the lowpass crossover frequency above 80Hz.
Note: In general, setting the lowpass cross-over frequency too low, will result in a weak and muddy
sounding bass, while setting this crossover frequency too high will result in a ‘booming’ bass sound
and reduced low end extension.
5.2 SuBSONIC HIGHPASS CROSSOVER FREQuENCY ADJuSTMENT
Adjust the SuBSONIC potentiometer according to your needs. This setting depends on the dimen-
sion 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! But you
can set the SuBSONIC control to its lowest position at 10 Hz, which will not longer impose an audible
effect on the music played.
5.3 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 this amplifier 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 EA1350D/EA1800D, that drives the subwoofer system! The low pass 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.
Set the volume control of your head-unit to approximately ¾ 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.
EA1350-1800D Manual (EDF).indd 13 28.02.2006 12:03:45 Uhr