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© 1999 Directed Electronics, Inc
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 the 250d is only suited for subwoofer applications, the low-pass crossover is
active at all times. The crossover point is adjustable to allow more precise system oper-
ation.
• 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 advan-
tage to spend some extra time with this adjustment, 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.
• 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 crossover settings the way you like. Test discs and
analyzers may help with this process, but in the end it's your ears that count - listen to
the music !