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In Reply to: RE: Q re: foam in tomservo's flat baffle project posted by Ian L on November 10, 2024 at 13:50:53
Soft , so it will make a nice little horn when the driver is mounted and to damp any reflections back to the baffle.
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
Follow Ups:
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.
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
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 !
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
Thanks Tom
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