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RE: You overdid it.

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DrChaos

A

In Reply to: RE: You overdid it. posted by magiccarpetride on February 21, 2011 at 10:34:18

You don't want a clean "specular" acoustic reflection from the back and sides.

You want a randomized, but not-too-damped reflection.

It's all about psychoacoustics. Your ear and brain hear both the direct sound (which can be confused with strong short reflections) and the overall spectral balance of the diffuse sound field, which should have delays and phase randomization.

Not surprisingly, the best concert halls do the same thing.

So, get your organ and golden nymph statues going.

Follow Ups:

RE: You overdid it. - hemholtz 04:09:41 02/22/11 (5)
an early reflection, meaning one that happens in the time space where the sound is said to be "related", will physically alter the direct sound wave when the reflected sound and direct sound intersect so that you cannot hear it correctly. your brain cannot correct for this as the sound wave has been corrupted.

getting a better bass amp, or eq-ing it to get correct tonal balance is a better idea than using an early reflection to boost a frequency range, as the effected range will be comb filtered.
- RE: You overdid it. - triamp 04:48:21 02/22/11 (4)
  My triamped MG 3.6's have to be placed too close to the back wall, my room is small. So I built foam wedge "panels" to place behind the speakers. If your rear wall is too close you will get what is called "comb filter" response at your listening position due to rapid arrivals of the reflection.
  SoundLab sells a product like this to go behind their full range electrostats, called the Sallie. They are about $1,000 a pair.
  The photos (above) show what I built, for $100 / pair. Bought the foam wedges from eBay.
  - Soundlab Sallie (Open in New Window)
  Edits: 02/22/11 02/22/11
  - RE: You overdid it. - hemholtz 04:55:51 02/22/11 (3)
    i would try to get as much distance between the speaker and the treatment as i could. the spl will be lower so the sound reflected from the absorber will be less. even the best absorbers are quite reflective. those ones you made are about as good as it gets though.
    - RE: You overdid it. - triamp 05:10:34 02/22/11 (2)
      Yeah, I've got no more room behind to move the foam panels any further back... due to the angle of the wedges the reflections are mostly up and down, not back out at the listener. But it would be better to move them back. If I had room.
      - RE: You overdid it. - hemholtz 05:55:21 02/22/11 (1)
        
        In Reply to: RE: You overdid it. posted by triamp on February 22, 2011 at 05:10:34
        
        in the bottom picture it looks like the absorber is tight against the speaker. i would worry about sound reflecting back to the driver like a box speaker in that arrangement. even a small distance would do some good.
        
        RE: You overdid it. - triamp 06:04:02 02/22/11 (0)
        
        In Reply to: RE: You overdid it. posted by hemholtz on February 22, 2011 at 05:55:21
        
        There's walls and stuff back there, can't move the foam at all. Adding the foam was a big improvement.
        
        Doesn't sound anything like box speakers. I have box speakers too, the MG 3.6's don't sound at all like them.
RE: You overdid it. - josh358 19:30:28 02/21/11 (0)
Where'd you get that photo of my acoustical treatment?

I just replaced the third caryatid from the left.
RE: You overdid it. - magiccarpetride 15:13:52 02/21/11 (0)
"So, get your organ and golden nymph statues going."

I'm OK with golden nymph statues in my room, but I'm not so sure about the 'organ' statues (especially if you meant erect organ statues).

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