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In Reply to: RE: Seeking advice on effective wall diffusion? posted by russ69 on April 07, 2016 at 07:21:15
I presume you mean the wall behind my head? (Which I call the back wall! ;-)) )
Yes, I had heard this is problematical. In my last house, I had about 9' clear behind me - to the wall - so in this new room I have put this on the wall behind me:
It is made of 1" thick cork sheets (the shapes are 1/4" cork), glued to a thin board backing ... and I think does what it needs to do - at least, there are no sonic anomalies in the room, except for the lack of depth which I mentioned.
Regards,
Andy
Follow Ups:
Nyyyyyyce setup...I looked at your Maggies and after three or four double takes (and a few head scratchings) I went and checked out your profile ; ) brilliant job.
Side note: is that your art work hanging above the couch? I see the 'AR'.
Edits: 04/09/16 04/09/16
having taken my IIIas as far as they could go, in terms of tweaking:
* 3-way active
* hardwood frames, and
* braced stands
. . . I wanted to remove the IMD which happens when the mid driver shares the same mylar as the bass driver. Your 20.Xs I think don't suffer from this problem as the mid is separate from the bass driver ... however, because they're all in the same frame, you still have the problem of the vibrations in the frame produced by the bass driver ... shake the ribbon cage.
Whereas, when I touch the top of my bass panel frame (when playing some reggae, say), I can feel it vibrating ... but the mid/ribbon frame is not. :-))
Regards,
Andy
Hi Andy,
Interesting to see your new listening room. 12 x 19 foot is not very much for your Magnepan. It can work, I had my Tympani IIIA lined up in a room measuring 3 x 3.8 m!
http://twin-x.com/groupdiy/albums/userpics/Tympan_III-A.jpg
In the case of my Tympanis, because of their sizebthey blocked most of the reflections from the wall behind the speakers. Basses were not very far from the wall, maybe 60 cm, but there was a full output down to 30 Hz. Sweetspot were minimal...
As I later "slaughtered" the Tympanis (resulting in two 1 m wide speakers), I used some damping panels in order to block/reduce the refections from the front wall, placed a bit behind the mid/tweeter section, halfway speaker-to-wall. It worked well.
Roger
As you can see, I made it in '89. This was just after we had moved into our last house and there was a 15' long part of a (cement-block) side wall in the listening room that needed something on it, to stop 'flutter echo'. So it was an acoustic treatment that looked nice! :-))
In that room, it was made/painted on the floor - so it was actually all in one piece. Unfortunately, when it came time to move it into our new house ... we realised it was too damn long to fit round the corner of the stairs, into the new listening room - so I had to saw it in half and then put those frames around each section!
Andy
Yes, that was a really interesting build, a bit of mix and match.
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