Extron Electronics SI 28 - Manual (Page 13)

Observed
Problem
Possible Cause(s) Remedial
Action
1 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
lower frequency is obtained.
11 SI 26 and SI 28 Speakers • Troubleshooting Tips