Hogtunes REV 200-AA : 2 Channel Class D Amplifier / 2x100 watts (1998 - 2013 - model years) - Manual (Page 10)

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adjusting your systeM-please read!
In order to make your new system perform as good as it was designed,
please take a minute to understand and follow these tips:
1) Set your “Automatic Volume Control” (AVC) to 3 bars. After extensive
on-road testing, we found that this AVC position works and sounds best.
Your new amplifier has been specifically set-up for this radio setting.
2) Your Hogtunes system is designed specifically for a motorcycle at speed.
Exhaust noise and wind noise have been taken into careful consideration
in how your system performs. How your new system sounds in a driveway
or garage is radically different from how it will sound at highway speeds.
Although your system was set-up with a factory radio, with its bass and
treble controls in the middle position, if you feel the need to make
adjustments please do so (carefully) at your normal cruising speed.
3) If you have an aftermarket car radio on your bike, everything will work
fine. Please remember that car radios are designed to work in an envi-
ronment with little or no exhaust or wind noise. Many car radios have
features such as equalizers, loudness contours, surround effects, etc., all
designed for a quiet environment and all of which will hurt your ability to
hear your motorcycle system at speed if left on. Please take a minute and
turn as much of these “features” off. With a car radio in your bike, the
only adjustments you should be able to access for best performance are
volume, bass, treble, balance and fader.
4) If you’re using an external device to supply music through the radios AUX
port, we have an article on our website that can help make your
peripheral audio device sound as good as it can. The article is at:
http://www.hogtunes.com/techzone_files/Level_matching.pdf