Planar Speaker Asylum

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Planar Speaker Asylum

Just measured my quad 57's in my 10x 12 man cave

67.87.50.47

My equipment Manley snapper amps Manley jumbo shrimp pream ; manleey chinook phono pream. Rega rp8 turntable. Using my I phone as a tone generator.

At 1000 hz 80db as reference.
20hz= 54
40hz= 67
60hz = 88
100hz= 90
250hz= 78
500hz = 82
1000hz= 87
2500hz= 74
5000hz= 70
10000hz= 77

Just my info with my system and my rebuilt ok quads

Follow Ups:

RE: Just measured my quad 57's in my 10x 12 man cave - Satie 12:36:36 02/12/17 (5)
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. .
- Where does that resonance come from? - 13th Duke of Wymbourne 14:54:18 02/12/17 (4)
  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
  - Understand that - E-Stat 13:32:50 02/13/17 (0)
    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.
  - RE: Where does that resonance come from? - Satie 19:41:26 02/12/17 (2)
    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.
    - Thanks nt. - 13th Duke of Wymbourne 12:34:15 02/13/17 (0)
      nt
    - RE: not unlike "baffle step" correction - BigguyinATL 07:27:31 02/13/17 (0)
      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
RE: Just measured my quad 57's in my 10x 12 man cave - neolith 18:00:51 02/11/17 (0)
Not sure what to make of it. Why are you getting 87db at 1000 Hz when your reference is 80 db at 1000 Hz?
I suggest getting REW5 (free!) and ideally buying a calibrated USB microphone (about $50-75) to get a better idea of what's going on with your speakers and your room. I use an old analog RS sound level meter to "calibrate" the SPL readings on the REW5 using the built in pink noise generator as the source. I find the iphone app "SLA lite" or Keuwlsoft "SPL Meter" on Android work just as well.

I married the perfect woman. The downside is everything that goes wrong is my fault.

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