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As soon as the music gets loud, the amp
shuts down!
• Check the M•800’s meters. Be sure that
OL
is not lighting up frequently or continuously.
• Can the amp breathe? The M•800 amps
draw their ventilation air in from the front
and out through the side panels. They
need plenty of fresh air to stay cool.
Do not block the ventilation ports.
• There may be a dead short somewhere in
your speaker setup, or the total impedance
of the load is too low. Turn the amp off and
rectify that right away.
Something’s missing in the mid and high
frequencies!
• If you’re using horns with compression
drivers, please read the
CONSTANT
DIRECTIVITY
section on page 15.
It hurts when I touch my arm, or my leg, or
even my head!
• You have a broken finger.
Bad sound!
• Is it loud and distorted? Turn down the
signal coming from the mixer or signal source.
• Is the input connector plugged completely
into the jack? Check the speaker connec-
tions and verify that all connections are
tight and that there are no stray strands of
wire shorting across the speaker terminals.
• If possible, listen to the signal source with
headphones plugged into the console. If it
sounds bad there, the problem’s not in the
amplifier.
Noise/Hum
• Check the signal cable between the mixer
and the amplifier. Make sure all connections
are good and sound.
• Make sure the signal cables are not routed
near AC cables, power transformers, or
other EMI-inducing device.
• Is there a light dimmer or other SCR-based
device on the same AC circuit as the
monitor? 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’s not in the
amplifier.
REPAIR
Service for the M•800 amplifier is available
only from one of our authorized domestic ser-
vice stations or at the factory, located in sunny
Woodinville, Washington. (Service for Mackie
amplifiers living outside the United States can
be obtained through local dealers or distribu-
tors.) If your amplifier needs service, follow
these instructions:
1. Review the preceding troubleshooting
suggestions. Please.
2. Call Tech Support at 1-800-258-6883, 8am
to 5pm PST, to explain the problem and
request an RA (Return Authorization)
number. Have your amplifier’s serial
number ready. You must have an RA
number before you can obtain service at
the factory or an authorized service center.
3. Keep this owner’s manual. We don’t need it
to repair the amplifier.
4. Pack the amplifier in its original package,
including endcaps and box. This is very
important. When you call for the RA
number, please let Tech Support know if
you need new packaging. Mackie is not
responsible for any damage that occurs
due to non-factory packaging.
5. Include a legible note stating your name,
shipping address (no P.O. boxes), daytime
phone number, RA number, and a detailed
description of the problem, including how
we can duplicate it.
6. Write the RA number in BIG PRINT on top
of the box.
7. Ship the amplifier to us. We recommend
United Parcel Service (UPS). We suggest
insurance for all forms of cartage. Ship to
this address:
Mackie Designs
SERVICE DEPARTMENT
16140 Wood-Red Rd. NE Ste 5
Woodinville, WA 98072
8. We’ll try to fix the amplifier within three
business days. Ask Tech Support for
current turn-around times when you call
for your RA number. We normally send
everything back prepaid using UPS BLUE
(Second Day Air). However, if you rush
your amplifier to us by Next Day Air, we’ll
ship it back to you UPS RED (Next Day Air).
This paragraph does not necessarily apply to
non-warranty service.