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© 2005 Directed Electronics, Inc. all rights reserved
CROSSOVER SETTINGS AND GAIN ADJUSTMENT
Your Directed Audio power amplifier
needs to be adjusted carefully to
achieve maximum performance. These
are some guidelines to follow when fine-
tuning the amplifier.
Because this amplifier is only
designed for subwoofer applica-
tions, the low-pass crossover is
active at all times. The crossover
point is adjustable to allow more
precise system operation.
Try and keep the setting low
enough to prevent image smearing
(you should not be able to hear
male voices from the subwoofer)
but not so low as to create a gap
between the subwoofer and the
mid-bass/midrange speakers. It
will be to your advantage to spend
some extra time with this adjust-
ment, listening to familiar music or
system set-up discs to achieve the
kind of musical reproduction that
you prefer.
The gain adjustment allows you to
set proper signal match for clean,
quiet amplifier operation. Start by
playing some music you are
familiar with. With the gain adjust-
ment on the amplifier in the middle
of its rotation, bring up the volume
on your head unit to the 3/4
volume setting or until you start to
hear distortion or clipping. If you
hear distortion before you reach the
3/4 volume setting of your head
unit, reduce the gain setting on the
amplifier and start to raise the head
unit volume again. When you can
listen to the music at or slightly
above 3/4 on your head unit
without audible distortion, slowly
raise the gain of the amplifier until
distortion is heard, then back off
the gain until the distortion is not
audible. This setting will allow you
to reach full output with all but the
quietest of source material, while
avoiding excessive noise in the
system.
For systems using the Remote Sub
Level Adjustment, increase the
subwoofer gain on the amplifier by
25% and set the Remote Sub Level
knob to the center position after
making all system gain and filter
adjustments. This will give the
Remote Sub Level Control a wider
range of adjustment to the
subwoofer output.
You should take into consideration
the effect that gain adjustment has
on system frequency response and
staging. Again, plan on spending
some time with music that you
know getting the gain and