User guide

13
Monitor suddenly stops working.
• Turn the monitor level down or off
• Repeat steps in the troubleshooting sections above before continuing to the next steps.
• Carefully check to see if the amplifier's back plate is hot! If the monitor has been running
at 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.
• If the monitor is still not responding, it should be returned to the dealer where you
purchased it or to KRK for servicing.
Sound quality changes.
• Repeat steps in the previous troubleshooting section above before continuing to the next
steps.
• It is possible that the change in sound quality is due to changes in the room or 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
a different position or return the room back to where the sound quality was acceptable.
• Disconnect the signal cable at the input of the monitor and adjust the System Gain or
volume control to 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 slowing
increasing the System Gain setting from the minimum setting. It is important that the
System Gain is slowly adjusted from 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
whatever, it could be that one or more of the drivers (woofer or tweeter or both) 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 tweeter (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.
• Cover the woofer so you can hear mostly the tweeter. Is the tweeter producing a clear
sound? If there is not a clear tonal quality or any sound at all then the tweeter probably
needs to be replaced.
• Verify the source signal level has not changed or source has changed. This 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) than
it is not the active speakers.
• Once you have a better idea of what may be at fault then call us and speak with
someone in the service department. They will help you determine the best solution to
correct your monitors. The service department can be reached at 954-949-9600.