KH 805 |
21
Cleaning and maintaining the subwoofer
CAUTION
Damage to the product caused by liquids!
Liquids entering the product can cause a short-circuit in the electronics and damage or even destroy the product .
X
Keep all liquids away from the product .
X
Before cleaning, disconnect the product from the mains power supply (see page 14) .
X
Use a soft, dry, and lint-free cloth to clean the product .
Troubleshooting
Problem
Cause
Solution
There is hum or buzz coming
from the KH 805 when an
audio cable is connected .
A cable is defective, the cabling is
bad, there is ground loop in the instal-
lation or the level of the audio source
is too low .
Check all cabling to eliminate the
cause of the problem, do not lay
signal cables parallel to mains
cables, use balanced cables, use
the ground lift switch (see page
19) or send higher signal levels
from your source and reduce the
level on your subwoofer and your
monitors .
There is a sudden reduction of
the subwoofer’s output level,
the LED POWER ON
I
changes
from green to red, the output
level is reduced by 6 dB .
The temperature of the power ampli-
fier is too high .
Ensure sufficient ventilation of the
subwoofer and/or reduce the input
signal level, or add extra subwoof-
ers to increase LF headroom . When
the temperature has dropped
again, the LED POWER ON
I
lights
up green and the output level
reduction is canceled .
The LED POWER ON
I
lights
up red in time with low-fre-
quency input signals .
The signal level is too high,
the protection system is active .
Reduce the signal level .
For further information, please refer to the “Questions & Answers” section at www .neumann .com .
