Operation; Trouble Shooting - Quest Engineering QTA 2120P User Manual

Common problems with ceiling
speaker installations
System is distorting. Check for the following
causes:
1. Too many speakers set to too high a power
tapping for the power of the amplifier
Solution: Calculate the total power
draw and re connect the speakers to a
lower the wattage tapping. (See below)
Some cheap ceiling speakers have
incorrect taping labels. A 10 watt speaker
may really be drawing 15 or 20 watts.
The only way to test this is with an
impedance meter on a single speaker. A
15% discrepancy can mean that a 100
watt system will only be able to power 7
or 8 x10 watt speakers safely. Be aware of
this booby trap. Always plan to have 20%
more power than you think you will need.
2. Incorrect output connection: If you ac-
cidentally connect your terminal strip
on the amplifier to the 8 ohm output
instead of the 100/70V line, you will have
distortion and risk damaging the amplifier..
3. Short circuits and no circuits: Check that
your wiring has not been accidentally cut,
miss-connected or generally damaged
in the course of installation. This can be
common with building sites with multiple
trades people installing equipment into the
same ceiling cavities as the audio system.

Operation

After all connections are completed, turn on
the power. If necessary, turn the gain control
on the rear panel to what you desire. We
suggest turning the gain level to maximum
always.

Trouble Shooting

If the amplifier fails to work as required,
please check the following:
No Power, No Lights
• Make sure amplifier power switch is on.
• Make sure mains power switch is on at
the wall.
• Check the mains and DC fuse.
• Replace with only the correct type and
rating.
Distorted Output
• Check that the speaker type is correct for
the output that you are using (ie. 4-16
100V line).
• Check for any short circuits on the
speaker line.
Very Low Output Volume
• Make sure that the speaker line is not
shorted.
• Check speaker types and ratings.
Continually Blows Fuses
• Make sure that the speaker line is not
shorted.
• Check speaker types, ratings and if on
correct output.
Amplifier Keeps on Cutting In & Out
• Make sure that there is adequate
ventilation around the amplifier.
• Check the vent slots are not covered
or blocked and the fan on the rear is
functioning correctly.
• Check also speaker types, ratings and for
any short circuits on the speaker line.
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