speaker placement..

Nothing that a sawzall, demolition bar, sledgehammer and shopvac can't cure! Unless it's a structural arch....then try plan B.

Alternatively my guess is that you should be able to wrap the collum in either an acoustical absorption or difusion material to address the problem. I'd definitely consult the experts though, and I would not be one of them.

Marco

Ttrhp & Ozfly, I was glad to read this since I have first-order XOs and a similar room feature, though not so big. BTW Ozfly, what Thiels are first-order ? ( Just curious. )

Even if the arch is structural it can be replaced with a laminated beam or steel beam that will take up less room. I have had to do this at work to remove a column that was not strategically located.

It cost about $1000, which is a lot less than good speakers.

Hi Tobias. I owned both the CS2.3's and the CS6's -- they each had a first order cross-over (i.e., a 6 dB per ocatve slope). My understanding is that all Thiel designs utilize this cross-over (combined with wide bandwidth drivers) to avoid phase shift issues associated with other, steeper-sloped crossover systems. BTW, there have been lots of interesting discussions about that here on the Gon with an overall conclusion that no single factor, such as phase shift, determines the overall sonic calibre of a speaker -- everything is a matter of what trade-offs are to your liking. Happy listening!

thanks for the imfo so far,i just did an exact measurement of the room.the room is8.9ft x 21..within the room on 1 side of the arch is 8.9 x 8ft with the ceiling 8ft tall,the arch is about 1.3ft from the ceiling down.on the 2nd side of the arch is 8.9ft by 13ft. with 9 ft ceiling.sawing the arch is not an option due to the wife,and if i place the speaker right under the arch i will have an empty space aproximately 8.9 x 8 and make the room look kinda weird with the speakers kind of in the middle of the room.please help.thanks