High ceilings and hardwood floors

Ladies and Gentlemen. Scratch my last post as it has no relevence. It's late and I have no idea what I was thinking about. Sorry.

Actually, Doug28450 that is correct for a full wavelength--but a half wavelength is a node as well--so 35Hz is going to be a problem. It is very difficult to correct that with acoustic treatment. I have hardwoods and an 11 foot ceiling. A nice oriental rug works well--but it still has very little effect on low frequency. You might need to go to electical correction--it's considered a last resort by many, but sometimes there's really no other way. In my system I had to do this (17 foot wall to wall)--the flat response is a great improvement over the slight resolution loss in the bass (it's bi-amped so the correction is only on the bottom end). I'm using a McIntosh EQ--there are better ones, such as the TACT and I've heard the P1A is good if you are using digital only--but I have no experience with this product. Acoustical wall treatments will help the high freqency--I would recommend those for the first reflection.

Abstract7, you are exactly correct on the 35 Hz. I typically don't calculate the half wavelength because I know in my own mind that it must be considered. I should have mentioned in my earlier post, but I got ahead of myself and hit enter before I realized what I had left out.

Liguy, you had me worried there for a minute. It was late for me also and I was afraid I had made a math error. After I checked the math, I was afraid someone had changed the speed of sound :-). Thanks, Doug

DJ, I had a similar problem sans the 16' ceilings. A 10'x13' area rug over the listening area of a large stone tile room took care of the direct reflections from my CLS's. Canvas works on the back walls. Others tell me that plants, with lots of leaves (i.e. the dreaded ficus tree) do a good job at difusing sound.