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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: RE: Well?????? nt posted by Roger Gustavsson on September 30, 2011 at 13:00:33:
Sorry for dredging up an ancient (but very worthwhile) thread, but I stumbled on these scanned pages in my latest attempt to minimize the intrusiveness of my First Reflection Traps (FRT) in my listening room. Roger Gustavsson very kindly made this post:
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I have scanned the article on stereo image in the Hifi News & Record Review.
http://twin-x.com/groupdiy/albums/userpics/stereo_image_1.jpg
http://twin-x.com/groupdiy/albums/userpics/stereo_image_2.jpg
http://twin-x.com/groupdiy/albums/userpics/stereo_image_3.jpg
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This article was from November 1984, written by GP Millward (formerly with Wharfedale). I used this guidance with my Gunned MMGs and it does one thing really well: it banishes the head-in-a-vise phenomenon. It also works in my 11 foot by 11 foot space, making it worth checking out by small room listeners.
In a few days, I'll update my FRT thread. But here is the key point: by angling the MMGs at about 15 degrees as shown, the front wall reflection point to the listener is actually the edge-on null. The first reflection is the side wall reflection, and is the out-of-phase signal. By using FRTs angled just right, this reflection gets "beamed" to reflect at what would be the front wall reflection point if the speakers were "normally" placed. That first reflection is delayed by about 10 milliseconds, making it about as good as it can get in such a small place.
MG-bert
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- RE: Well?????? nt - MG-bert 16:50:38 05/28/13 (0)
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