Posted by Roy on September 09, 2003 at 13:16:46:
In Reply to: Re: Room Lenses posted by Lew on September 09, 2003 at 06:55:30:
Lew,
Thank you for the compliment and thank you for the insight into your solutions.
Whilst I was at the re-build process on a few occasions this year I had my other panels in front of my fireplace, they were only their because I had no where else convenient to put them. I noticed an immediate improvement in the sound stage. I would have liked to move say 4 tubes (2 from each corner) into the center, directly in front of the fireplace but this room is also used by my wife and to have 4 of those in a line smack bang in front of our fireplace and also covering up my wifes ornaments on the self above would push her over the edge for sure. I will play around with the current placement though over the next few months.
One thing I forgot to mention earlier in this thread was that my main source of inspiration to build them came from some room treatment devices that I saw at our show here in London last year. These were tubes of about 6” and 9” diameter and about 1m long. One side was absorbent and the other side had a reflective surface. The idea was that you could stack these and rotate them to get the effect required. If I can trace the name of the manufacturer I will post the info.
To my panel re-build.
I am not sure how to play this really, the greatest part of me wants to show all SLOGERS exactly what to do but some of the details and materials took me so long to work out to ensure perfect operation that I am a little loathe to pass them on in entirity on SLOG, please understand if I appear to hold back a little sometimes. Who knows, I may have a problem in one area or another as the months pass so I might have to modify what I have done, so far though I am totally delighted. This project has turned out to be much more difficult than it appeared at first. If I were to write it up completely, pictures and all, it would take ages but I am happy to answer any questions you or others may have.
Before I started I knew that the first problems to solve was the stator insulation and the membrane coating. So that I could test my options I constructed 12 mini panels that replicate the exact usable size of the largest small panel in our speakers.
On these panels the front and rear stators can be removed in a few minutes to have their stator insulation swapped over or to swap out the membrane and its coating.
The streaching jig for the Mylar that you see in the picture is way over the top to produce the necessay tension. The contraption I use on the full size panels uses hand applied tension, this is by far the best way to get the tension spot on.
I will post more information as soon as I can prepair it.
Roy