Tweakers' Asylum

Re: YES, do treat your room! One caution.

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bdiament

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In Reply to: YES, do treat your room! One caution. posted by Jon Risch on April 26, 2004 at 22:05:37:

Hi Jon,
Cylindrical traps offer diffusion (when the reflective side is used) and when placed at the early reflection points (using the absorptive side), in my experience leave nothing to be desired. What do you believe the wall panels and diffusors would add?
Happy Listening!
Barry

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Re: YES, do treat your room! One caution. - Jon Risch 22:10:44 04/27/04 (1)
Bass traps placed at the 1st reflection points are NOT necessarily the best place to absorb/damp room modes, and are not as wide as most of the effective wall panels. It is a compromise use and result comapred to a full wall panel of adequate thickness (minimum of 6" thick fiberglass).
The diffusion is NOT very broadband, but mostly in te mids only. A dedicated diffusor will have a wider bandwidth, and a more random diffusion pattern, etc., rather than just horizontal specular (bounced off a vertical cylinder) difussion.
Yes, compared to nothing at the first reflection points, and to no diffusors, they are great, but if al three are used in concert, they can really tweak out a room!
You think i reccommend all that work for three different DIY acoustic devices because I am a sadist? No, wait, don't answer that!

Jon Risch
- Re: YES, do treat your room! One caution. - bdiament 04:26:16 04/28/04 (0)
  Hi Jon,
  "Bass traps placed at the 1st reflection points are NOT necessarily the best place to absorb/damp room modes..."
  Agreed. That's why we built a couple of rooms full.
  Besides, with any half decent speaker placement, the first reflection points will never coincide with the places to damp room modes. With enough traps, each can be placed and oriented to address a specific place in the room.
  
  "The diffusion is NOT very broadband, but mostly in te mids only.
  The reflective surface of the traps we built will reflect highs as well as mids (especially with the carefully chosen fabric we used, which isn't sucking up all the highs). It really doesn't get broader than that, since lower frequencies as you know, behave differently than those of shorter wavelengths.
  
  Thanks for your input Jon; it is always appreciated.
  Happy Listening!
  Barry

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