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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
Efficiency is more than a sensitivity rating. A 95dB sensitive speaker that sits between 8 and 12ohms full frequency response is a FAR easier speaker to drive than a 100dB sesitive speaker that dips to 2ohm from 20hz to 120hz. Most SET amplifiers will wheeze and puff on the latter speaker and will have zero issues with the former.
The LS-3/5a is only 82dB sensitive but sits 11-16 ohms. So a SET has no problem with these speakers. And while you are limited by volume the speakers can only handle a max of 50watts so yoy are limited by volume regardless of the amp you choose.
The title of the forum should probably be called high sensitive not high efficiency and then there should probably be levels like high senstive 92dB-96dB and very high sensitive 97-102dB and ultra high sensitive 103dB+
Follow Ups:
I think some manufacturers suggest efficiency based upon ratings for the drivers utilized rather than testing the assembled whole. I had a pair of speakers rated at 90 dB but found that a minimum of 200 watts was needed in a medium sized room with playback levels averaging in the low 80s.I believe that was for two reasons. One, as RGA explained, was an impedance curve which dipped below 3 ohms at two different frequencies. The other was a very complex 1st order crossover designed for time/phase considerations. A friend brought over a 50 watt amp he'd built to test with those speakers and if fell flat on its face. Normally 50 watts should work with 90 dB I expect.
"The piano ain't got no wrong notes." Thelonious Monk
Edits: 07/23/17
I have 90dB Audio Note AX Twos. 7 watts is recommended. I ran my OTO on AN Js for 13 years. The OTO measures 4.2 watts undistorted. I could play AC/DC or Black Sabbath or Nightwish etc without any problems or having the system puff or wheeze. The AN J is 92.5dB in corners and 89.5dB free standing.
I think people need to simply try the stuff out. AN is likely the biggest selling SET maker globally and their matched speakers are around 90-97dB. And most of their amps are under ten watts. So to me it's one thing to discuss specs and measurements but the ear test is the final and only test that counts.
Now it could be their amplifiers are simply way more robust than average too and I did compare the Kit One to a 300b Cary. The KIT one had vastly better deep bass control. So this is not all about the speaker itself.
Well here's the real complication ... :)A 96 db /m/8 ohm @2.83V Speaker is less efficient than a 96db/m/16ohm @2.83v speaker but they both have the same sensitivity ...
How's that for magic ...!!!
Regards
PS , those AN sensitivity numbers were already debunked and are fake news ...
Edits: 07/27/17
so trials are absolutely called for.
"The piano ain't got no wrong notes." Thelonious Monk
Thanks, RGA.
"If people don't want to come, nothing will stop them" - Sol Hurok
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