On 7/04/2018 8:02 PM, Dave Plowman (News) wrote:
In article ,
Trevor Wilson wrote:
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.

The LS 3/5a has a rectangle of felt round the tweeter, but not the
bass/midrange.


**The LS3/5a is the most over-rated piece of junk ever to be foisted on
the audio industry. It's continued existence is adequate evidence that
most listeners believe what some reviewers say, rather than listening
for themselves.

Don't get me started on LS3/5a speakers. And don't tell me how the BBC
designed them. The idiot who designed them should be shot.

--
Trevor Wilson
www.rageaudio.com.au