by jadis » Wed Jul 14, 2004 11:01 am
In the letters to the editor wherein my letter to HP was published, I wrote primarily to thank them for the great article one of their writers wrote about room acoustics and its great effects to our sound.
Back in '84, I had Bose901 S3. ( I guess jjm will tell me who he is now since he must be pleased with this newsbit. ) I put them in a squarish room about 16' x 16'. The sound was not a bit close to what I heard in the showroom where I bought the speakers (locally). I remembered reading in Audio magazine about someone putting eggtrays on his ceiling to 'tune' his room and to diffuse the reflected sound. I sent
my guy to the palenge to buy 200 pesos worth of eggtrays. I think he came home with a jeep full of eggtrays. I had them thumbtacks-ed to the ceiling and, boy oh boy, my jaw dropped at how solid and how
pure my sound became. I recall that it even sounded good while I was OUT of the room listening through the door!!! That was the beginning of my quest for proper room treatment.
I then read about the LEDE concept in Audio mag. Live end Dead end. At around '86, me and my very technically oriented audio buddy set out to actually follow the LEDE to the hilt. Based on specs of the
article, we constructed wooden frames that looked like Planar speakers and stuffed the front side with fiberglass wool from top to bottom with plywood as backing. Then we covered it with cloth. These panels were supposed to be placed behind the speakers. I did only on panel, but my friend made his acc. to the real specs, meaning it has to be 3 panels folded by hinge to resemble a phone booth. (without a door)
In my single panel, I was surprised to hear that my soundfield has deepened. Highs became less harsh and mid was very focused and solid. My friend reported even more dramatic effects with his 3 piece panels on EACH Spica TC50. I visited him am was utterly dumbfounded beyond belief that despite have all three sides surrounded by flat panels of fiberglass (leaving only the front side open for direct speaker sound to travel to us), his sound actually has a solid CENTERFILL! I was like the sound from the speakers PIERCED through the panels and created a holographic image in the center. Being a technical guy, he explained that it is bec our ears, listening to direct sound, translates that to our brain, and we 'see' the center imaging bec our brain told us what was really recorded in the musical source, that there was a center image in the recording, barring the physical barriers that were set up. The phone booth panels (as we love to call them ) ultimately
got sold to Lito Gelano whose wife was not all that happy to have them planted in the main living room where he used it to demo his gear. The idea of the panels was to create a dead end at the speaker are and the live end at our listening chair area. Not bad, but ugly.
After that, I moved to another house, and transported all my equipment to the living room of this house. Marble floor, cement walls, and nothing else. Remembering my sound from the old treated room, my sound became like ten cents. In short, trash. I was too unhappy I decided to build a new room on top of my
garage. Once finished, I treated the walls with cork initially, and the sound was bad, like I was inside a drum with someone banging on it. I invited Mang Dima who brought along my good friend, Eric Dimson, an organist and pianist who would become habitual visitors to my top- of-the-garage room. Eric made great suggestions as to what to do. I changed the cork to acoustic boards and immediately the harsh
echo disappeared. Eric suggested putting slats on the side walls to diffuse the sound even more, and I did; and the sound again, improved further. BTW, the room was 'small' about 13' x 16'. Hence the necessity
to treat the room since the sound waves would be travelling at faster velocities. At this point I came across Tube Traps. And after reading from Stereophile how it was made and what it was made of, another
friend of mine ventured into making them via our ingenious craftsmen. The traps were to be put in corners, preferably at the speaker end, where the sound pressure velocity would be highest. It has to be killed, to prevent bass nodes from clouding our sound. In the end, both of us
loved what the traps did, reducing bass boom and producing a more balanced sound from top to bottom. The sound here was warm and I enjoyed it. Speakers then were Thiel 3.5 and I had ARC D115, and SP10MKII with my present analog system. The year was about 1987.
The house had to be demolished, torn to the ground to build a new one in 1990. 3 years of limbo. But by the time my house was done, I had what I have now, in the pictures I posted. 17' x 23' room with a 10' light dome ceiling sprayed with acoustic fiber from the UK. I installed wooden slats all around the wall after that
spray. And built my own little RPG diffuser to put behind my listening chair. I made corner traps, stuffed with fiberglass and one round tube trap for the center image to be more solid. Also made 6 pcs of Room
Tube ( our friends love to dissect one pc and build it locally to be cheaper), and floor entirely rugged. And when I owned the gargantuan 800s, I had to make Bass Tunes to lessen the boom. All worked well,
and that is what I have now. My room is tuned to produce a warm sound that is tailored to my listening bias. And I prefer a wide open soundstage that is deep, hence my placement is a 'pull-out' from the
back wall, something I learned from Mang Dima and Eric. And as as final piece, I should mention that I was very impressed with Eric's room, with JBL 250s pulled in midway into the room, the sound was incredible, realistic and life-like that creates a sense of an eerie 'you- are-there' feeling...I learned from the guy, and I'm glad Mang Dima brought me there. And, umm, the last thing I have to say is, Eric's is the first audiophile I know, or maybe ever, to put his turntable INSIDE his bathroom to prevent room reverberation from affecting his analogue system. What dedication. OF course in those days, we did not have turntables with good isolation like we have now, but still, that proves that the quest for good sound is infinite.
Last edited by
jadis on Wed Jul 14, 2004 7:32 pm, edited 1 time in total.