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In Reply to: RE: Highest Efficiency Home Audio Speaker ever made? posted by bcguitar on April 09, 2014 at 19:59:42
though the latter have powered woofers, which is cheating. Then again, they claim a rather breathtaking 109db sensitivity; the K-horns claim a mere 105db.
Edits: 04/09/14 04/09/14 04/09/14 04/09/14Follow Ups:
Measuring a response peak or average? If so, what frequency. There are ways to do numbers for Marketing and numbers for Engineering. Sometimes never the twain shall meet.
nt
Average I guess. Just wondering what the loudest speaker at one watt one meter is.
The great Frank Massa of RCA fame in the 1930s discussed a compression driver loaded by horns on both sides of the diaphragm as yielding an efficiency of 70% if memory serves. He and Olson worked on several complex folded horn systems that loaded the heck out of both sides of a cone or diaphragm; some were produced by RCA, some not. One such system was described in "A Compound Horn Loudspeaker", available at some expense from the Acoustical Society of America (see below).
Massa was also intrigued at the prospect of very high efficiency direct radiator loudspeakers using much heavier than typical voice coils: his U.S. Patent #2,227,943 is a real eye-opener. He and Olson did a great deal of work on this subject in the 1930s. If this subject is of interest then Google them both and read, read, read.
Well Steve, you've got me re-reading Olson's Acoustical Engineering, Dynamical Analogies, etc. Of course the loading on the back of the diaphragm is customary. Klipsch gives a formula for the compression chamber used to load the backside of the diaphragm in his Klipschorn patent, which seems to follow Olson's work on the subject. I'm still waiting to hear what of Massa's findings you have verified. I am very interested.
111db - 115db by JBL for a comp driver is up there might be some a little higher but band with will be the determining factor. for home use you still have to fudge because you are not going to have the room in your room to fit a rig of woofers that can keep up so you will have to decide on the level of the horns by your chosen woofers.
https://www.jblpro.com/pages/pub/components/2490.pdf
http://www.danleysoundlabs.com/products/loud-speakers/gh60/ wide range
http://www.audioheritage.org/html/projectmay/technology/435be.htm
http://www.communitypro.com/files/literature/spec%20sheets/M4_SPEC.pdf?phpMyAdmin=c9cc5b3953d87385dc22218d669e7aab
http://www.jblpro.com/www/products/Vintage/
moray james
I would use pink noise to get average.
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