MACKIE FRS1700 - Manual (Page 13)

13
Owner’s Manual
Owner’
s Manual
Partial Sound (frequency band missing)
• Incorrect EQ settings in the electronic
equipment. Ensure all EQ settings and filters
on the mixing console or preamplifier and on
other equipment are set for normal operation.
Ensure level controls on electronic crossovers
and associated amplifiers are correctly set and
that all cables and connections for such
equipment are connected and working properly.
• Loudspeaker not working properly. Swap with a
good one.
• The fuses inside the amplifier may have blown.
These are not a user-serviceable. See next page
about service.
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?
Different speaker loads can cause different
volume levels on each side.
• Try switching sides: Turn off the amp, swap
the speaker cables at the amp and turn the
amp back on. If the same side is still louder,
the problem is with your speaker cabling or
the loudspeakers. If the other side is louder
now, the problem is with the mixer, the
loudspeaker processor, the amp, or the
line-level cabling.
Poor Bass response
• Check the polarity of the speaker cable
connections. 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
continuously. 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 cause a "ground loop"
hum.
• Sometimes it helps to plug all the audio
equipment into the same AC circuit so they
share a common ground.
Repair
For warranty repair or replacement, refer
to the warranty information on page 19.
Non-warranty repair for Mackie products is
available 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, during normal business hours, Pacific
Time, to explain the problem. Tech Support will tell
you where the nearest factory-authorized service
center is located in your area.