Repair - Mackie FRS-1300 Owner's Manual

One side is louder than the other
• Are both level controls set to the same position?
• Check your source signal to make sure the left
and right signals are balanced.
• Are the speaker impedances matched? Differ-
ent speaker loads can cause different volume
levels on each side.
• Try switching sides: Turn off the amp, swap the
speaker cables at the amp, turn the amp back
on. If the same side is still louder, the problem
is with your speaker cabling. If the other side is
louder now, the problem is with the mixer, the
amp, or the line-level cabling.
Poor Bass response
• Check the polarity of the speaker cable connec-
tions. You may have your positive and negative
reversed at one end of one speaker cable.
As the music gets loud, the amp shuts
down
• Make sure the OL LEDs are not lighting con-
tinuously. If so, turn down the signal source or
the amp level controls.
• Can the amp breathe? It needs plenty of fresh
air to stay cool. Do not block the ventilation
holes.
Noise/Hum
• Check the signal cable between the mixer and
the amplifier. Make sure all connections are
good and sound.
• Make sure the signal cable is not routed near
AC cables, power transformers, or other EMI-
inducing devices.
• Is there a light dimmer or other SCR-based
device on the same AC circuit as the amplifier?
Use an AC line filter, or plug the amplifier into a
different AC circuit.
• If possible, listen to the signal source with
headphones plugged into the console. If it
sounds noisy there, the problem is not in the
amplifier.
• Is there a cable-TV audio feed in your system?
An incorrect ground may causes a "ground loop"
hum.
• Sometimes it helps to plug all the audio equip-
ment into the same AC circuit so they share a
common ground.

Repair

For warranty repair or replacement, refer to the war-
ranty information on page 19.
Non-warranty repair for Mackie products is avail-
able at a factory-authorized service center. To locate
your nearest service center, visit www.mackie.com, click
"Support" and select "Locate a Service Center." Service
for Mackie products living outside the United States can
be obtained through local dealers or distributors.
If you do not have access to our website, you can call
our Tech Support department at 1-800-898-3211, Monday-
Friday, 7 am to 5 pm Pacific Time, to explain the problem.
Tech Support will tell you where the nearest factory-
authorized service center is located in your area.
Owner's Manual
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