High Efficiency Speaker Asylum

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

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tomservo

In Reply to: RE: Q re: foam in tomservo's flat baffle project posted by Ian L on November 11, 2024 at 14:44:45

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)

Follow Ups:

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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