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Max SPL 6-panel vs 4-panel Quads

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In Reply to: RE: Nwer Quads are Made in China.. For some folks this matters.. nt posted by kentaja on June 20, 2017 at 15:58:46

Why is it that the 6-panel Quad 2912 don't play any louder than the 4-panel 2812 (or the ESL-63)?

I thought that the max SPL was defined by xmax (max diaphragm displacement) and Sd (diaphragm area), and a larger Sd could lower diaphragm displacement, hence make the speaker to play louder. Obviously this is not the case, as Quad states the same maximum output for the two systems.

Any comments?

Per.

Follow Ups:

RE: Max SPL 6-panel vs 4-panel Quads - kentaja 08:06:38 06/21/17 (2)
That is not how the 63 design works.

The additional panels are part of the outer ring. The output of the outer ring is quite low compared to the inner rings. What you get with a couple more panels is a larger baffle maybe another 1-2Hz in extension but not more output.
- RE: Max SPL 6-panel vs 4-panel Quads - PerStromgren 04:29:52 06/22/17 (1)
  > What you get with a couple more panels is a larger baffle maybe
  > another 1-2Hz in extension but not more output.
  
  Is that right? A larger baffle (if that is all I get) could be had for much less money than adding active panels!
  
  It would be interesting comparing a 4-panel Quad sitting between wooden panels the size a 6-panel Quad and a proper 6-panel.
  
  Per.
  - RE: Max SPL 6-panel vs 4-panel Quads - kentaja 05:33:01 06/22/17 (0)
    You do get some additional power in the bottom range of the speaker with the additional panels. A bit more weight and authority if you will. The question becomes is this an improvement a step in the right direction? For some the answer will be yes for some the answer will be no.
    
    There are no free lunches. Everything comes with a price. The additional panels do indeed give the speakers some additional power in the bottom but I think you sully the midrange and top end to some extent. Nothing bad it is still a Quad in every sense.

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