Observed ProblemPossible Cause(s) Remedial Action1 Speaker easily
lifted from mount
assembly
Locking hex cap
screw not tightened
enough
Following the steps on page 9,
tighten the hex cap screw until
it is not possible to remove the
speaker.
2 No sound heard
from speakers
Speaker cables
not connected or
damaged
Output device
(e.g., amplifier)
Reconnect or replace speaker
cable. Check cable routing.
Check that the output devices
are plugged in and powered on.
Check that all cables are
connected correctly.
Check that an output signal
is present. If present, change
cables and/or use a known
working set of speakers.
Check that volume settings are
adequately high.
Replace suspect devices with
known working devices. Retry
the system.
3 Output poor or
intermittent
Damaged cables or
faulty connection
Check cables and connections.
Reconnect or replace if needed.
4 Constant buzzing,
hissing, or
humming
Faulty device(s)
within sound
system
System grounding
inadequate or
suspect
Check all devices. Swap out
and test with known working
devices to isolate interference
source. Replace faulty device(s).
Check grounding to devices and
repair where needed.
5 Poor low
frequency output
Incorrect speaker
polarity connection
between multiple
speakers
Check polarity between
speakers. Incorrect polarity
(out of polarity) results in low
frequencies cancelling each other
out. Reverse polarity for each
speaker in turn until a greater
low frequency is obtained.