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Amplifiers: Questions., Couple of questions!
krafty
post Jun 26 2012, 00:43
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1) For a small auditorium about 30 meters long, 20 meters wide and 4 to 6 meters tall, equipped with 12 small cheap loudspeakers (6 each side) along the hall, what is THE BEST WATTAGE amplifier for speeches? We have setup two TDA2005 circuits plus one small "workaround" for a preamplifier (actually a weaker amp before the power amp).... but it doesn't seem to deliver good sound. Was it because we needed a piezoelectric microphone? Is it best to be equipped with a real preamplifier?

2) When someone talks over the microphone, and the speakers "distorts" according to some tonal sylabs, what sign is that... bad amplifier, weak speakers or lack of a hardlimiter circuit?

3) Going around the previous problem, what kind of circuit must one have to "control" voice pitches so that one won't "shout" over the mic or not be clearly listened by the crowd (because his voice may be too low).


THANKS FOR ANY REPLIES

This post has been edited by krafty: Jun 26 2012, 00:46
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Arnold B. Kruege...
post Jun 27 2012, 12:31
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QUOTE (krafty @ Jun 25 2012, 19:43) *
1) For a small auditorium about 30 meters long, 20 meters wide and 4 to 6 meters tall, equipped with 12 small cheap loudspeakers (6 each side) along the hall, what is THE BEST WATTAGE amplifier for speeches? We have setup two TDA2005 circuits plus one small "workaround" for a preamplifier (actually a weaker amp before the power amp).... but it doesn't seem to deliver good sound. Was it because we needed a piezoelectric microphone? Is it best to be equipped with a real preamplifier?

2) When someone talks over the microphone, and the speakers "distorts" according to some tonal sylabs, what sign is that... bad amplifier, weak speakers or lack of a hardlimiter circuit?

3) Going around the previous problem, what kind of circuit must one have to "control" voice pitches so that one won't "shout" over the mic or not be clearly listened by the crowd (because his voice may be too low).


These days a "small cheap speaker" could anything. Offhand, I'd figure that you're not going to risk driver burnout until you get above 20 watts per speaker.

How you have the speakers hooked up could be very important. If they are hooked in parallel, each amplifier could be seeing as low as 1 ohm load, which is very bad, on top of the obviously too-little power from the amps if they were seeing an ideal load.
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