High Efficiency Speaker Asylum

RE: Q re: foam in tomservo's flat baffle project

149.22.82.15

Ian L

In Reply to: RE: Q re: foam in tomservo's flat baffle project posted by GM on November 10, 2024 at 20:55:09

Hey, thanks for that ! You know, I'd never in a million years have guessed that was part of it. I was thinking: Is it supposed to be non-reflective or supposed to damp resonance of the baffle itself? The horn like depression completely escaped my imagination.

Thanks GM. Your input is much appreciated. I.

Follow Ups:

RE: Q re: foam in tomservo's flat baffle project - tomservo 06:47:06 11/12/24 (3)
Hi
There would be a very slight "horn loading" but the main part is minimizing secondary radiations that effect the stereo image.

A more detailed explanation is here although more aimed at studio sound but applies in the home as well.
Tom
- the why of the flat baffle / small driver (Open in New Window)
- About enclosing the rear. - Ian L 20:48:20 11/12/24 (2)
  I hope continued questions on this aren't asking too much.
  
  Doing a little noodling around, enclosing the rear of the driver with BassBox as it already has the T&S data. Of course it's calculating the response with the baffle dimensions for the prism.
  
  My question is , Will the larger baffle simply extend low frequency or will it create a hump at the bottom end of Bassbox's calculated range?
  If that's how it works then in short, how should I approach design of the rear enclosure?
  
  (Incidentally, Green trace was about 2 litre volume, Red is the 10 litre)
  
  Thanks !
  - RE: About enclosing the rear. - tomservo 08:42:32 11/13/24 (1)
    Hi
    No problem. For a sealed box, there is less of an ideal size than with vented, however in your prediction, you can see the larger volume gives a response shape with a lower "Q". Generally speaking a Q of .7 to around .6 is ideal and the red curve would be the lower Q of them.
    IF one made the box much smaller, you would see the Q rise and that would accompany a bump at the bottom end.
    Off hand, any of those curves would be good and not exaggerating anything.
    I would add loosely fill the back with cotton padding or fiberglass if sealed
    IF you use these with a subwoofer later on, the sealed box is the way to go.
    
    Edits: 11/13/24
    - back soon with results , Thanks ! (no text) - Ian L 09:50:16 11/15/24 (0)
      Thanks Tom

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