Architectural Acoustics Quadra 15P, User Manual, Page: 10 / 22

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First, make sure the unit has AC power and is turned ON. If so, the Power LED (4) should be
illuminated. If it is not, check that the ON/OFF switch (3) is in the ON position, check the IEC power
cord connection (2), making sure it is fully engaged and seated. Make sure the AC line cord is
plugged into a working AC outlet and check the circuit breaker (1) {see the REAR PANEL/Circuit
Breaker section for safety instructions}.
Next, run a cable from the Quadra 15P’s inputs to some other device capable of determining this (for
example, a power amp and speaker) to make sure the inputs of the Quadra 15P are receiving a
signal. If there is still no output, make sure the Volume control has been turned up to a reasonable
level (one-third to halfway).
Has the Quadra 15P been exposed to direct sunlight or excessive heat? If so, it may have triggered
the unit‘s thermal protection. Turn off the unit and cool as best as the situation allows (DO NOT use
liquids for this purpose!).
If there is still no output, it may help to read the owner’s manual completely.
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As this can be AC outlet-related, try plugging the Quadra 15P into a different AC outlet. Hum
problems may result from using different circuit breakers for the mixer and the Quadra 15P.
Make sure the microphone input (8) is disengaged when not in use by checking the Mic On switch
(7). It should be in the OFF position.
Make sure that shielded cables have been used to transport the signal to the Quadra 15P’s inputs.
Speaker cables with 1/4" or XLR plugs are most likely to hum.
Check to make sure light dimmers are not on the same circuit as the Quadra 15P or the mixer (or any
source devices). If light dimmers are in use, then it may be necessary to turn them full ON or full OFF
to eliminate or reduce hum to tolerable levels. This is an AC wiring/light dimmer interference
problem, and not the fault of the Quadra 15P. The third wire ground plug on the AC plug should
NEVER be removed or broken off, as this seriously compromises safety.
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First, make sure the mixer (or signal source) is not clipping or being overdriven. This can sometimes
occur when the Volume control (6) on the Quadra 15P has been set too low (too far
counterclockwise), and it takes a lot of signal to drive the unit to full power.
Make sure the input plugs are fully seated in the input jacks (5) on the rear panel of the Quadra 15P.
Check to see that the proper inputs are being used (5) for line-level signals—not the mic input (8).
Make sure that a power amp has not been plugged into the input jacks of the Quadra 15P.
If an extension cord is being used to provide AC power to the unit, make sure it is of sufficient
current capacity and not also being used to supply power to any other units. See “GETTING AC
POWER TO THE Quadra 15P” for details.
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