On 6/04/2018 7:44 PM, Dave Plowman (News) wrote:
In article ,
Trevor Wilson wrote:
On 6/04/2018 8:25 AM, Dave Plowman (News) wrote:
A mid range unit - say about 4" - in a suitable sealed box. Remind me of
the difference between mounting it on the rear of the baffle, front, or
recessed flush to it? I've seen all done on commercial designs.


**Flush mount mitigates diffraction effects.

How would diffraction manifest itself? Ie, the audible effect?


**Usually, image quality. Diffraction effects seem to cause a rather
diffuse image. I believe John Dunlavy was the first to deal with the
problem:

https://patents.justia.com/patent/4167985

As a consequence, listening to many of Duntech's speakers resulted in a
surprisingly good ability to recreate the original space. Much like a
well set-up pair of Quad ESLs can manage.

John used absorbent felt, around the drivers on the baffle to achieve this.

--
Trevor Wilson
www.rageaudio.com.au