Troubleshooting - KRK Systems 12sHO Guide D'utilisation

rumble, traffic noise, footsteps, etc. These subsonic noises will be eliminated (masked) by the natural
high-pass filter effect of using near-field monitors with a response that goes down only as low as 40 or
50Hz. Thus, infrasonic problems may not be recognized (heard) in the studio. However, since virtually all
home-theatre systems use subwoofers with bass management, consumers will hear these infrasonic
problems at high volume levels in their home.
Bass management effectively extends the low-frequency response of near-field monitors down well into
the 25 to 40Hz range (depending on the subwoofer used). This allows the engineer to take evasive action
in the studio, such as engaging high-pass filters on input channels and microphones, adding pop filters
and suspension mounts to microphones and correcting HVAC and other rumble problems.

Troubleshooting

If you're having trouble, check out these tips...
If there is no power, check to see if...
•
The power cord is plugged into both the IEC socket on the rear panel of the unit and into the AC
mains.
•
The AC mains voltage is matched to the operating voltage requirements. If the AC mains voltage is
higher than the selected voltage, it is possible that the fuse needs to be replaced.
•
The power light is illuminated on the front panel of the monitor or on the back panel of the
subwoofer. Note that with the new RoKit series (Generation 2) or the VXT series, the logo illuminates
on the front panel to indicate that power is on. If the power indicator is not on, turn the power switch
off and check the A/C mains fuse(s).
•
NEVER USE A LARGER AMPERAGE FUSE THAN IS SPECIFIED! See the Specifications section for the
correct fuse value. Turn the power switch back on. The power light should illuminate.
•
Note: If a fuse change was needed (and the AV mains voltage is set correctly) yet upon powering the
unit back up the fuse(s) blow again, the product needs to be returned to the dealer you purchased it
from, or to KRK, for servicing.
If you can't hear any sound...
•
Repeat the steps in the 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.
•
Make sure that:
•
The audio source cable is plugged into both the source output and the unit's input.
•
The Input Sensitivity is set correctly.
•
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.
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