What Can We Hear?
Audio Empire wrote:
The Klipshorns were 50% efficient. That meant that every two Watts
of amplifier power produced one acoustic Watt of sound (One acoustic
Watt is defined as being equivalent to 107.5 dBSPL at around a meter
from an omnidirectional source)!
Even if that famous 104 dB/W figure is true, AFAICR that's a half-
space measurement, and the horns are highly directional. It doesn't
equate to 50% efficiency, which would be miraculous. I reckon it's
about 15% efficiency, which is extremely good.
Of course, most speakers are nowhere near that efficient and it can
often take more than 100 electrical Watts to produce one Acoustic
Watt at one meter. That would make those speakers 1% efficient. Now,
since sound pressure dissipates at a rate inversely proportional to
the distance one is from the speakers,
You're assuming omnidirectional raidators.
Andrew.
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