255C-LS

Hello, This 255c-LS does feature an aimable tweeter, this is done by pushing on the outer ring of the tweeter to swivel it, it can move up to 15 degrees. The V60 Slim (https://www.polkaudio.com/en-us/product/built-in-speakers/in-ceiling/v60-slim/113394.html) does have a swivel mount tweeter as well that can be aimed towards the listening position. Both would be ideal for the situation you are encountering. For more information, you can also give our customer care team a call at 800-377-7655 (Product Support) Mon - Sun: 9AM - 9PM EST or email us through https://www.polkaudio.com/en-us/contact-us.html

Hello, our in-wall/in-ceiling speakers are designed to operate free air or infinite baffle. If back box enclosures must be used; the recommended sealed enclosure volume is 1.2 cubic feet. This does include driver displacement. Installing 1/2 to 3/4 of a pound of Dacron is also recommended to dampen the enclosure. We recommend using 1/2 inch MDF for the building material.

Hello, Usually these speakers work best with open air behind them but in the case that you want to build a sealed enclosure, we can recommend that you leave about 2-3 inches of space around the speaker. There is also a switch on the speaker itself for EQ that you may try to test the options to see what sounds best within the enclosure.

To best match the excellent L600 speakers using an in-the-wall center channel speaker, the 255C-LS is the best choice. My first choice for in-the-wall surround speakers is the 265-LS speakers. If free-standing speakers are possible, I recommend the L400 center channel and the L100 Bookshelf speakers as surround speakers.