TROUBLESHOOTING
If there is no power, check to see if...
· Check to see if the power cord is plugged into both the IEC socket on the rear panel of the active speaker and into the AC mains. Verify that the
AC mains are active by using an approved AC tester or simply connect a lamp with a working light bulb. In some cases, the AC mains may be
controlled by a light switch or power strip with suppressor that may not be in the ‘on’ position.
· Verify that the power switch on the active speaker is in the ‘on’ position.
· Check to see if the power light is illuminated. The power light is the KRK logo on the front panel of the monitor. If
the power light is not illuminated, turn the power switch OFF and check the A/C mains fuse(s). The fuse is located
directly below the power receptacle.
NEVER USE A LARGER AMPERAGE FUSE THAN SPECIFIED!
· After the fuse has been checked and replaced, turn the power switch back on. The power light should illuminate.
· Check to see if a fuse change was needed. If you power the monitor back on and the fuse blows again, the monitor needs to be returned to the
dealer or distributor where you purchased it or to KRK for servicing.
If you can’t hear certain sounds...
· Repeat steps in the previous troubleshooting section above before continuing to the next steps.
· Check to see if all other audio devices using the same AC outlet are still operating.
· Check to see if the audio source cable is plugged into both the source output and the monitor input.
· Check to see if the signal source (E.g. mixing console, work station, CD player, etc.) is turned up to a level that can properly send a signal to the
monitors.
· Check to see if the audio source is in mono or stereo, or information in the mix may also be panned differently which will result in differing
cancellation. Audio heard in stereo and not heard in mono may be a result of phase cancellation due to long delays between left and right
channels or polarity inversion. Avoid polarity inversion by using matching cables.
· Check to see if one of the monitors is working. Exchange the audio input cable from the non-working monitor to the working unit. This will
determine whether it's really the monitor, a faulty cable, or some other glitch in the audio chain.
· If the monitor is still not responding, it should be returned to the dealer where you purchased it or to KRK for servicing.
If the 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.
The 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.
· A reduction in bass frequencies may be a result of polarity inversion between the 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 long delays are being used. Avoid polarity inversion by using matching cables.
· Disconnect the signal cable at the input of the monitor and adjust the 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 volume from the minimum
setting. It is important that the volume 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 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 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 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.
The monitor hums or makes other loud noises...
· Make sure that the power cord is plugged snugly into the IEC socket on the rear of the monitor.
· Check the connections between the signal source and the monitor. Make sure all connections are secure and that the cable is not damaged or
wired incorrectly.
· If you are using an unbalanced output to balanced cable conversion, make sure it is correct. The shield is connected to the unbalanced ground
of the source and pins 1 and 3 of the XLR (or the sleeve and ring on the ¼” TRS jack).
· All audio equipment should use the same ground point. Check all other devices using the same AC output in the building like light dimmers,
neon signs, TV screens, and computer monitors. These devices should not be using the same circuit.
· Verify that the signal cables are not routed near AC power lines or other EMI sources (including wall power adapters and computers).
· Excessive hiss may be a result of an incorrect gain setting before the speaker connection. Verify the source signal is not noisy
before connecting the monitors. This can be tested by connecting the signal source headphone outputs to a set of headphones.
Once you have a better idea of what may be at fault then contact our service department. They will help you determine the best
solution to correct your issue.
