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In Reply to: Room acoustics help posted by Ray on December 28, 1999 at 07:36:26:
Your resonant peaks (read: room modes and standing waves) are caused by the low frequencies interacting with the room and the environment. If you have speakers in a room you will have room modes. All listening rooms are faced with this challenge.
You will never be able to completely eliminate the peaks but you can tame them. You must first understand that your SPL meter is NOT accurate at low frequencies, but as I'm sure you have experienced, you can get a good idea of where the modes are by watching the meter and keeping your ears open. Sounds like you are in need of some bass traps at the very least. What size is your room? What is in the room? This information would allow me to help you a bit more.
The room is 12' x 19'. It has a vaulted ceiling that starts at 8' high on the one side of the room and reaches to about 13' high on the other side of the room. It has carpet and a plush love seat and sofa. The two windows in the room have mini blinds. The back of the room has a 5' opening to the rest of the house. There is a basement below the room and the floor is not very solid. I was thinking about buying a support post for the basement so I could sturdy up the floor a little more. Would this help my situation?Thanks
Sounds like a decent room save for the windows. Are you sure that your speakers (and sub--are you using one?) and your listening position is in an optimum position? Have you played around with this? If not, start there. You'll be amazed at how much difference even a small movement of an inch or two can make.
The support would possibly help but I really don't think so. You'd have to mass-load the entire floor to really get a benefit, and your problem is inside the room, not below it. How are you at DIY/handyman projects? Jon Risch has an excellent recipe for DIY bass traps that I am planning on making very soon. You can also purchase them from ASC but they're rather expensive.
Let's solve your problem!
I spent several days moving my sub around and I did find a spot that leveled off the peaks significantly (-10 dB). It was only a foot and a half away from the original location. I can't believe it made that much of a difference.
Amazing, isn't it? Have you played with your speaker locations as well? You may find that you have been missing a wealth of imaging/soundstage information. Give it a shot and let your ears be the judge!
Happy listening!
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