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In Reply to: RE: What qualifies as a high efficency speaker? posted by Travis on July 21, 2017 at 17:47:16
Well around 92dB 1w 1m is approximately 1% electro acoustic efficiency and 102 would be around 10%, 112 would be 100% (impossible). What makes this harder to gauge is that the above assumes a source with no directivity and directivity can raise the on axis sensitivity without rising the true efficiency.
If this wasn't complicated enough, then one can add horns to the mix where it IS possible to get say 40 or 50 or more% true efficiency BUT only in a relatively narrow range and there simply aren't any compression drivers which are efficient up high. If one wants to end with flat response, it is the efficiency at either end of the spectrum that governs what you have in the middle.
Hope that helps
Tom
Follow Ups:
What about the Fostex "supertweeters" (T90A, T900A, etc.)?
On paper at least, they seem to be sensitive & to have reasonable output "up high"?
Or are you specifically referring to broad bandwidth treble horns & drivers to support them, Tom?
Also, I do recognize that mfgr. specs are sometimes, shall we say, optimistic. :)
all the best,
mrh
Well lets say one wanted to use that driver as part of a broad band system.
IF you wanted "Flat response" on axis then you could get it between about 3K and 20 K with an on axis sensitivity of over 100dB.
Flat response is derived by attenuating the mid band down to the upper and lower limits of the desired bandwidth.
At the same time, without knowing the directivity, one cannot know the actual efficiency, the best one can get then is the on axis sensitivity.
Directivity makes the difference between a bare 75W bulb and a high beam headlight
nt
all the best,
mrh
Thanks, tomservo.
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