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If the monitor suddenly stops working...
Turn the monitor level down or off.
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Repeat the steps in the troubleshooting sections above before continuing to
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the next steps.
Carefully check to see if the amplifier's back plate is hot! If the monitor has been
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running at its highest power output for an extended period of time, it could be
that the unit has become overheated, and the protection circuitry has shut the
system down momentarily. The monitor provides maximum circuitry
protection against AC power surges, amplifier overdrive, and overheating of
the amplifiers. Turn the monitor off, then wait 30 minutes to allow the back
plate to cool down. Turn the power switch back on.
Increase the volume to check for normal operation.
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If the monitor is still not responding, it should be returned to the dealer where
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you purchased it or to KRK for servicing.
The sound quality changes...
Repeat the steps in the previous troubleshooting section above before
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continuing to the next steps.
It is possible that the change in sound quality is due to changes in the room or
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listening position. Low frequencies (bass response) can be increased or reduced
by changes such as furniture and/or large equipment placement. Try moving
the speakers or listening area to a different position or return the room back to
where the sound quality was acceptable.
A reduction in bass frequencies may result from polarity inversion between the
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left and right channels or long delays between the left and right channels.
Information in the mix may also be panned differently, which will result in
differing cancellation. Check the audio source and verify if one channel is
polarity-flipped or if long delays are being used. Avoid polarity inversion by
using matching cables.
Disconnect the signal cable at monitor's input and adjust the volume control to
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the minimum setting. With power on, place your ear close to each driver
(tweeter/woofer) and listen for noise (i.e., a slight hiss or hum) while slowly
increasing the volume from the minimum setting. It is important that the
volume is slowly adjusted from the minimum setting to avoid any spike in
sound levels while the ear is close to the driver (tweeter & woofer). If there's
absolutely no sound whatsoever, it could be that the driver is at fault. It's also
possible that the problem lies somewhere in the electronics.
Play some non-distorted source material at a low volume. Carefully cover the
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woofer (to block the sound) without touching the diaphragm. Is the woofer
producing a clean sound? If there is not a clear tonal quality or any sound at all,
then the woofer probably needs to be replaced.
Verify the source signal level has not changed, or the source has changed. This
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can be tested by connecting the source headphone outputs to a set of
headphones and verifying the sound is not loud or distorted. If the sound is
poor at the source (preamp stage), then it is not the active speakers.
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