Problem: Squeals And Feedback - QSC RMX Series User Manual

26
TROUBLESHOOTING D É
Problem: hum
• Move cabling and signal sources
to identify "hot spots" in the
system. Cables with faulty
shielding are a frequent entry
point for hum.
Problem: hiss
• Unplug the amplifier input to
confirm that the hiss is coming
from the source or a device
upstream; erratic or popping
noises indicate an electronic fault
in the offending unit.
• To keep the normal noise floor
low, operate the primary signal
source at full level, without
clipping, and avoid boosting the
signal further between the
source and the amplifier.
Problem: squeals and
feedback
• Microphone feedback should be
controlled with mixer controls. If
noise continues to build up with
zero mic gain, there is a serious
fault in the signal processors or
cables. Working in succession
from the signal source towards
the amplifier, check each device
in the signal path by reducing its
gain or unplugging it.
Problè
• Dépla
appar
locali
câble
défec
comm
Problè
• Débra
confir
d'autre
audio
ampli
des b
indiqu
dans
• Afin d
de fon
sourc
élevé
écrêta
final s
Problè
Larse
• L'effe
micro
sur le
persis
existe
systèm
électr
câblag
sourc
de la
gain o
circui