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Power Dynamics PDA 12 Manual

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IMPORTANT
A cable that is too light will result in amplifier power being wasted due to the series resistance of the cable.
In addition, loss of low-frequency performance may be experienced due to a degraded damping factor.
Keep in mind that two 8 Ohm parallel linked speakers will equal a 4 Ohm load.
Looping speakers
Running too many speakers from a single amplifier channel may result in damage to the amplifier and/or in
degraded audio performance. To calculate the combined impedance of multiple identical speakers in
parallel, please use the formula below:
Impedance of a single speaker
--------------------------------------------------------- = Amplifier load
Number of speakers connected in parallel
Refer to your power amplifiers owners manual, for information on minimum recommended load impedance.
TROUBLESHOOTING
One certain method of determining if a speaker is faulty is to substitute a speaker that is known to work
correctly for the suspected problem speaker. If the “normally correct speaker” is experiencing the same
difficulties or problems as the suspected problem speaker, use the information below to isolate the problem.
No output
Possible cause / Action:
Speaker cables; reseat all connectors, substitute known good speaker cables, check solder joins, tighten
set-screws, inspect cable for damage, inspect wire or connector for stray strand that may short
Amplifier; make sure the amplifier channel is being fed a signal, most amps have a “signal input” LED to
indicate the presence of a signal, re-patch the speaker to an amplifier channel that is known to work.
Intermittent
Possible cause / Action:
Poor connections While it is possible for a faulty speaker to exhibit intermittent output, it’s more likely
that an output cable/connector is the problem. Check the soldering on your connectors. Tighten the set-
screws.
Constant noise, buzzing and/or humming
Possible cause / Action:
Faulty electronic; Any constant noise originates in the amplifier, mixer, signal processing, source device in
the signal devices, or line-level wiring. Check and correct system grounding as required. Chain check for
noisy sources or electronic components. Check wiring for shielding.
Poor low-frequency output
Possible cause / Action:
Improper polarity: When two speakers in close proximity to each other are connected out-of-polarity, they
can partially cancel each other out, especially at low frequencies. Check your speaker cables to be sure they
are all identically wired and connected. Check the balanced line signal cables to be sure they are all
correctly wired.
Do not attempt to make any repairs yourself. This would invalid your warranty. Do not make any changes to the unit.
This would also invalid your warranty. The warranty is not applicable in case of accidents or damages caused by
inappropriate use or disrespect of the warnings contained in this manual. Tronios cannot be held responsible for
personal injuries caused by a disrespect of the safety recommendations and warnings. This is also applicable to all
damages in whatever form.
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