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In Reply to: RE: Just measured my quad 57's in my 10x 12 man cave posted by fin1bxn@msn.com on February 11, 2017 at 13:00:41
In addition to Neo's remarks, I see that you are capturing the resonance peak of the Quad panels around 80-100 hz. Meaning that you are likely measuring too close to the speaker. Try the measurements at your listening seat and average a few sweeps at intervals around your head position. .
Follow Ups:
I heard an ESL manufacturer criticize that 57 resonance at a show last year. What causes it? It's not as if there is a mass-y diaphragm loaded by an air-spring, or does that burlap create an acoustic load?
Regards
13DoW
virtually all full range planars have to address an inherent diaphragm resonance in some way or another. Acoustat's approach was to glue felt sheets across approximately one-third the rear panel area.
Sound Lab takes a completely different approach . The single sheet diaphragm is affixed to a grid of flat cells having a progressively different height thus distributing and canceling the resonance.
I think Quad goes for a felt damping approach similar to Acoustat. If the felt gets loose, then the resonance becomes obvious.
That is an intentional choice of mylar tension that causes the resonance and it is used to compensate for the dipole cancellation. That way you can extend flat bass response at the listening seat, it is used on very many planars including maggies. It does not create a bump in the FR in the far field because dipole cancellation "eats" it up.
nt
for narrow loudspeakers.
As Floyd Toole (and others) profess - the smoothness of the sound power response of a loudspeaker is every bit as important as the direct on axis initial response when it comes to producing a better sounding loudspeaker.
"The hardest thing of all is to find a black cat in a dark room, especially if there is no cat" - Confucius
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