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I have a dedicated listening room in the basement of our home. It measures about 19(L) x 14(W) but with a ceiling height that is (mostly) less than 7 feet. The walls are gyprock (single layer) and the floor is cement with a good underpad and carpet. I have decided to add another layer of gyprock to the walls, in an attempt to improve the bass response, but I also want to add some absorptive material to the ceiling. My criteria would include: 1) significant reduction of upper midband and high frequency reflection; 2) not too expensive, particularly since I don't know if I will like the result; 3) appearance should not be too distracting - in other words, reasonably attractive; 4) easy to attach to a gyprock ceiling.
Can anyone suggest a commercial or home-made product that would meet my criteria? Thank you!
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My 2 cents:
I like the l and w dimensions of your room but the height is problematic. It requires absorption and you don't have a lot of height to give up to that. Also, that height is exactly half the room width. There will be a common room mode in the 40 - 45 Hz range ( plus the doubled frequencies ) because of that.
So between the floor and the ceiling ( for my 2 cents, again ), you would need something that has excellent absorption in the 40 Hz range and up, but doesn't take up much vertical space.
A very thick carpet, a shag for example, would do good but it would not deal with the low end of the range you need to control.
I have hung a 1/4-inch thick woven wool rug in my own listening/living room. It hangs about 9 inches down from the sheetrock ceiling, but that's because luckily I have over 9 feet in that dimension.
Wool is a great absorber, and it works down into the low end if it is spaced away from the surface behind it. You might get a worthwhile correction with 4 inches of spacing, which would leave you just over 6 1/2 feet of headroom.
A panel like that would not need to cover most of the ceiling, only about the central 25 to 40 square feet.
Just an idea, which I have not tried in a room with a ceiling lower than 9 feet, and it would still have to be accompanied by bass trapping in the room corners, absorption in the width dimension and perhaps a rug on the floor. However it is an idea which might just work with that tricky ceiling height.
Thanks, Tobias! Some really good advice here and I greatly appreciate this.
You are correct that the low ceiling height really limits my options but I like your suggestion regarding the rug as this would not cost too much (I have a good wool rug that should do the trick) and would not be too difficult to try.
Terry: before you tear up the ceiling and wool rugs, look at a table of absorption coefficients for the various materials (these are posted all over the web).
Rugs are not very effective overall, and have little or no impact at the low frequencies
Glad the idea sounds feasible. I'd be glad to know how it worked out if you got the chance to post.
give me an email i can help you tremendously I have learned a great deal
usedhifi@mail2lawrence.com
"I have decided to add another layer of gyprock to the walls, in an attempt to improve the bass response"
In many cases, this may actually make the bass worse, as the increased rigidity and mass will contain bass in the room better and lead to more pronounced room modes in the low frequencies. Since I don't know how 'sealed' your space is, I can't really offer too much more advice than use caution (plus, hanging sheetrock is a lot of work). If you do decide to invest in another layer, consider using Green Glue between the two sheets before attaching with fasteners. Most likely, carefully moving your speakers around will give you all the bass you'll ever need. Read up on basic acoustics before going too crazy with the construction.
I too had a lovely basement listening room, with low ceilings. I used a good amount of Auralex 24" x 24" x 3" foam pads, placed strategically on the ceiling at various reflection points - the GIK stuff is excellent too. It helped that my ceiling varied in height several times with various enclosed pipes, cable chases and the main support beam for the house effectively breaking up the evenness of the ceiling.
Good luck.
Thanks for the info.
Yes, I know there could be a down side to installing additional gyprock but I think it is worth the gamble (and effort and cost). Unfortunately, I won't know for sure until I try it out.
My room ceiling also varies in height from just a little over 6' to almost 8' but I think the main difficulty is that most of the ceiling is below 7'. The room sounds quite lively (lots of echo) and heavily damping the walls (which I have tried) does not produce a good result. What I need is a good acoustic engineer :-).
I've used them for about 7 years.
Or you could build you own. There's several YouTube videos on making your own traps.
Good stuff here, too. http://audio.tutsplus.com/tutorials/recording/a-basic-guide-to-acoustic-treatment/
Thanks for the tips. I have a lot of reading to do.
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