Filter
Top Products
3. Internal electronics (powered loudspeakers)
4. Enclosure and integral hardware
If no problems can be traced to any of these items, look for problems with external
electronics or cabling. Troubleshooting these items is beyond the scope of this manual.
12.4.2 Drivers
A faulty driver will usually cause readily audible distortions or other unwanted noises. In
other cases, they may stop functioning. Use your ears and test signals or other sound
source to determine which one is at fault. Normally, a faulty driver requires return for
service or replacement by EAW.
12.4.3 Input Panel and Wiring
Faults with these items will usually cause a driver to stop working or be intermittent.
For unpowered loudspeakers:
Check wiring continuity from the input jacks to the crossovers and from the crossovers
to the driver terminals. Many faults in this area can be field-repaired.
For powered loudspeakers:
Check wiring continuity at the input jacks and from the amplifier(s) to the driver
terminals. Many faults in this area can be field-repaired.
12.4.4 Crossovers
NOTE: This section does not apply to powered loudspeakers.
Faults with these items will usually cause drivers to stop working, be intermittent, or alter
the frequency response. If a crossover fault is suspected, the nature of the fault determines
the action. A poor connection or obviously open circuited, shorted, or physically
damaged component (such as from overheating) can be relatively easy to find and field-
repair. An improperly functioning component may require more sophisticated
troubleshooting, as the fault will likely be frequency dependent. A faulty crossover is best
returned for service or replacement by EAW.
12.4.5 Enclosure and Integral Hardware
Enclosure problems, such as loose hardware, faulty joints, or other structural problems,
will usually be heard as distinct buzzes, rattles, or other unwanted noises. To test for
enclosure problems, use a sine wave signal manually swept on the LF sub-system. The
input level should be varied, because certain problems can be level as well as frequency
specific. However, in no circumstances should the sine wave level be higher than 6 dB
below rated power (equal to no higher than 1/2 rated rms voltage). It may be possible to
field-repair some enclosure problems.
12.5 Problem Symptoms
Loudspeaker difficulties usually fall into one of the following categories. The causes for
each problem are listed in the most likely order of probability.
22