In Reply to: Diffraction and front baffle and cabinet design posted by chocolate_lover9999@yahoo.com on April 15, 2012 at 10:47:21:
This topic has been kicked around numerous times over the years on the Madisound and PE DIY forums. The consensus of the "gurus" seems to be that at LEAST a 2" roundover is required on the baffle edges to measurably and audibly improve diffraction effects. This of course complicates cabinet construction, and adds cost.
The "ideal" baffle shape, from a diffraction POV, is a perfect sphere. I believe this knowledge goes back to F. Alton Everest, or earlier, but only a few manufacturers (like Gallo) have every really implemented it in a commercial design.
Felt is also good to absorb early HF reflections from the baffle. A nice thick blanket of natural wool felt covering the entire baffle surface around the drivers (as used by Spica, Vandersteen, and others) will of course be of more benefit than just a donut around the tweeter, but would probably work best if "designed in," along with the crossover, as opposed to being applied as an after-market "fix." Which is NOT to say that after-market products such as Jim's will be of no benefit. Even the tweeter donuts sold by Madisound can result in some measurable and audible smoothing of the response at the highest frequencies.
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Follow Ups
- RE: Diffraction and front baffle and cabinet design - caspian@peak.org 12:26:44 04/16/12 (18)
- RE: Diffraction and front baffle and cabinet design - villastrangiato 14:21:15 04/16/12 (17)
- Diffraction and front baffle and cabinet design - caspian@peak.org 10:47:05 04/17/12 (16)
- RE: Diffraction and front baffle and cabinet design - villastrangiato 11:59:56 04/17/12 (15)
- Really?!!!!!!!!! - Timbo in Oz 01:03:34 04/18/12 (11)
- RE: Really?!!!!!!!!! - villastrangiato 11:20:36 04/18/12 (3)
- For the record, Villastrangio continues battering his way through the fact - Timbo in Oz 17:35:11 04/18/12 (2)
- RE: For the record, Villastrangio continues battering his way through the fact - jimdgoulding@yahoo.com 22:49:21 04/18/12 (1)
- RE: For the record, Villastrangio continues battering his way through the fact - villastrangiato 04:39:08 04/19/12 (0)
- RE: Really?!!!!!!!!! - villastrangiato 06:30:23 04/18/12 (6)
- RE: Really?!!!!!!!!! - Mushroom Soup 04:33:12 04/20/12 (2)
- It doesn't have to be - badman 13:31:04 04/30/12 (1)
- RE: It doesn't have to be - jimdgoulding@yahoo.com 06:56:21 05/10/12 (0)
- Comprehension poor today? - Timbo in Oz 08:05:17 04/18/12 (2)
- RE: Comprehension poor today? - villastrangiato 08:24:59 04/18/12 (1)
- I did NOT suggest that subs suffer from diffarction effects, I was commenting that it is often stated that - Timbo in Oz 16:05:43 04/18/12 (0)
- RE: Dennis Murphy?? - chocolate_lover9999@yahoo.com 17:01:36 04/17/12 (2)
- RE: Dennis Murphy?? - villastrangiato 18:40:53 04/17/12 (1)
- RE: Dennis Murphy?? - chocolate_lover9999@yahoo.com 09:18:51 04/18/12 (0)