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In Reply to: RE: 105db/meter NON horn loaded speakers posted by Bill Fitzmaurice on April 21, 2017 at 19:09:13
-unless you are going by sensitivity spec only.
That spec does not tell the full story. Efficiency (1 watt/1 meter) tells more.
In the case of paralleling multiple drivers, the total system efficiency remains exactly the same. This is because the one watt gets distributed over the multiple drivers. So if there are 8 drivers, each gets 1/8th watt.
In a nutshell, by using multiple drivers you can increase the sensitivity (if they are in parallel; if in series the sensitivity goes down with each added driver) but the actual efficiency is the same as if you had one driver only.
Radiating efficiency does go up as the number of drivers is increased. However, the upper -3dB frequency goes down by a factor of 0.7 with each doubling of drivers, so the law of diminishing returns is in effect, and eventually you reach a maximum system efficiency of some 25% with direct radiators. This was long ago quantified by Don Keele in his AES preprint on the efficiency of moving coil drivers. Were this not the case with sufficient drivers you could exceed 100% efficiency, and then you wouldn't need a cold fusion reactor to provide the power for the system.
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