On 1/10/2014 12:45 AM, Sal wrote:
"Jerry Stuckle" wrote in message
...


OK, so instead of putting out 100W to one eight-ohm speaker, you're
putting out 100W to two eight ohm speakers. So you have a 3db gain,
assuming the speakers are in phase.

It is no different than feeding two eight-ohm speakers from separate 100W
amplifiers, and the results are the same.

Discussion of audio amplifier power in home systems always prompts me to
relate this: I worked for a guy who was formerly a projectionist at Radio
City Music Hall in New York. He told me the sound system used amplifiers
rated at 70 watts per channel. That's a 6,000-seat theater.

He worked there a long time ago, so this not a claim of what they use today.
Use for perspective only, please.

"Sal"



Yes, this is where speaker efficiency comes into play. Due to the need
for stiffer cones, larger voice coils, etc., higher-power speakers are
generally less efficient than lower power ones. So 10W into a 10W-rated
speaker will provide a higher SPL than that same 10W into a 100W speaker.

And, of course, speaker placement is also critical, especially in larger
venues. You can cover a large area with not a lot of power if the
system is designed properly.

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Jerry Stuckle
JDS Computer Training Corp.

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