回复 2F ZQKQL 的帖子
"My room is 14.5' wide, 21' long, and has a 9' ceiling. I built the house, and chose those dimensional ratios for the listening room. I sit, not surprisingly, 7' from the back wall (the old "Rule of Thirds"). The X-2s are pretty far into the corners, but there's no problem with room gain or excessive bass. I usually have speakers farther out into the room. The room has been treated, and has a measured reverberation time of 0.32-0.36 seconds between 125Hz-4kHz. There's one ASC 16" Full Round Tube Trap in one corner behind the listening position.
My room was treated by Acoustic Room Systems (now part of CinemaTech). The system was originally developed in the Owens-Corning acoustical laboratory. It consists of 1.25" panels with thin drywall on one side and fiberglass on the other. If installed with the fiberglass out, the panel absorbs mid and high frequencies. If installed with the drywall facing out, it reflects mid and high frequencies and absorbs bass (through diaphragmatic action). A second material is a molded plastic material with a convoluted surface for dispersion. About 20% of the room is the convoluted surface, 70% reflective side out, and 10% fiberglass side out. Every surface including the ceiling is covered by one of these materials (except the windows and doors).
The entire scheme was modeled on a computer. The acoustician who modeled it (Norm Varney, now of AV RoomService) did an on-site measurement after the materials were installed, but before the fabric went up. We tweaked some of the material orientation and placement, and then the fabric was installed.
The room has a measured reverberation time of 0.34 seconds, +0.02 seconds, -0.05 seconds from 125Hz to 8kHz. (It rises to 0.49 seconds at 63Hz, and 0.85 seconds at 31Hz.)
I built the room five years before the acoustic treatments and picked the dimensional ratios. I reviewed in the room for five years before the ARS treatment, and have had it for six years since."
