Directed Audio 450d5, Руководство пользователя, Страница: 13 / 16

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© 2003 Directed Electronics, Inc
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.
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For normal complete system applicaton, the crossover selection switches should be
set to HPF.
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The crossover frequency control needs to be adjusted to suit your particular
system. For subwoofer applications, try to keep the setting low enough to prevent
the 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. For mid-bass/midrange settings, try to keep the
setting low enough to keep your sound stage in front of you, without overdriving
the speaker. It will be to your advantage 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.
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The gain adjustment allows you to set proper signal match for clean, quiet ampli-
fier operation. For full-range and simultaneous stereo/mono bass applications,
start by playing some music you are familiar with. With the gain adjustment 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.
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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.
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The same procedure should be used for adjusting the amplifier when the on-board
crossover is set to LPF or HPF, but you will also have to take into consideration the
effect that gain adjustment has on system frequency response and imaging.
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!
CROSSOVER SETTINGS AND GAIN ADJUSTMENT