Crossover settings and gain adjustment – Directed Electronics 2400 User Manual

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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.

For full-range and simultaneous stereo/mono bass applications, the crossover
selection switch should be set to FLAT. If the amplifier is driving your subwoofers,
set the switch to LPF, and for mid-bass/midrange output, set to HPF.

The crossover frequency control needs to be adjusted to suit your particular system.
For subwoofer applications, 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. 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.

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.

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!