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In Reply to: RE: Some grammatical acoustics concerns… posted by Ethan Winer on February 18, 2008 at 13:16:25
Thanks for the education Ethan. Very illuminating, if discouraging. I might not have known whether to believe you or not, if it weren't for the fact that when I did a Google search for RealTraps, the paid link hijacked me to Ready Acoustics instead. If I had not been to your site previously, I might have been taken in completely.
Another question-If I want to build a wall for absorption rather than sound proofing, what should I use? Are "acoustic walls" the right way to go, or is there something else you would suggest?
Bill
The best "acoustic" wall is no wall at all. Or at least a wall that passes bass rather than reflect it.
--Ethan
Ethan-
The speakers are ribbons, and thus the mid/high towers are dipoles. They must have a wall behind them to reflect the mid/high frequencies, or they sound horrible. The bass towers are conventional woofers, and so are not dipoles-what do you recommend I build the wall with, and what would the best materials be? Remember, I do not need sound proofing, but rather something that will absorb part of the mid/high frequencies so the sound does not become too bright-and, there will be an 18" gap between the top of the wall and the ceiling (speakers are 5 feet high).
Thanks again,
Bill
> They must have a wall behind them to reflect the mid/high frequencies, or they sound horrible. <
My personal feeling is that it's best to absorb the rear radiation from dipole speakers. Others might disagree. What can I say? :-> )
--Ethan
Ethan-
we are in agreement that dipoles must have some kind of rear absorption to sound good. to repeat my previous question-can you recommend what kind of wall to build behind the speakers to provide the needed absorption? I mentioned the "acoustic walls". Is that the right way to go, or should I choose some kind of double sheet rock wall with insulation?
All suggestions will be appreciated.
Bill
I don't know what an "acoustic wall" is. The best wall from a bass perspective is made of cardboard - no reflections. For mids and highs it would be something as absorbent as possible, like 4-inch thick rigid fiberglass.
--Ethan
Ethan-
Acoustic Walls are manufactured to reduce the amount of sound traveling from room to room in a house (sound proofing).
One more try at what I am asking your advice on, if I may:
I have to move my speakers because of WAF. I am going to build an interior wall which will be the wall behind the speakers (Infinity RS1B's)-what should I use to build the wall-double sheet rock wall separated by wood studs and filled with some kind of insulation? I am trying to achieve sound absorbtion, not sound proofing, with the goal of reducing mid/high glare.
Once again, thanks for your ideas.
Bill
> Acoustic Walls are manufactured to reduce the amount of sound traveling from room to room in a house (sound proofing). <
OH! I had no idea you were asking about isolation. Walls that isolate well are generally worse for the sound inside the room. This is a sad fact of acoustics. I'm not an isolation expert, but I do know that Green Glue is a popular and effective product:
www.greengluecompany.com
The site above has a lot of advice about sound isolation.
> I am trying to achieve sound absorbtion, not sound proofing, with the goal of reducing mid/high glare. <
Okay, now we're back to four inch thick rigid fiberglass.
--Ethan
Terrific-
So, put a regular sheet rock wall, and then apply the rigid fiberglass to that? In that case, does it matter how I choose to build the wall? Insulation in the wall wouldn't matter, since the fiberglass would take care of the absorbtion?
What about the bass towers? Since they are not dipoles, does the rear wall matter a lot, or not? I would have them out from the rear wall about 3 feet, and the mid/high towers 4 feet away from the rear wall.
Bill
Bill, you're asking a lot of questions that are all over the place and a moving target for me to answer. A wall that's good for bass inside the room is not good for isolation. You can have both but it's more difficult and costs more. But insulation inside the wall is always useful and helps both goals.
--Ethan
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