NOTE: This is a variation of the Delta Max. I am not using the same cross over. I built an AT screen so wanted to take advantage of it. Cut a hole in the wall. No going back. I stuffed the space with insulation, even more than shown. The wall is 6" deep including the drywall. The Delta10a has about 1.5" of clearange, which is just enough imo because it has a pole vent. The SEOS12 and DNA-350 just fit. This would NOT work on a 4" wall. That's what I thought I had and was considering 6" woofer ideas until I did some investigating and realized it was 6". Built a baffle out of scrap MDF. Who cares what it looks like, cause it won't be seen. Here it is. L and R to come. Because I designed the delta max already, I was already a step ahead. Finding a cross over that works did not take me long. I've now listened to a 950hz cross over and a 1200hz cross over. Both are very very good and I'm very happy I'm building this as my permanent centre channel (well, permanent is a vague term, right ). The sound is excellent for both cross overs. I'll take measurements soon. It's going to be tough to properly measure in some ways, because I'm confined to indoors. But it'll also make nearfield measurements quite useful being that it's in-wall. Nice to look at my wall and all you see is a screen. Lurking behind only I know how much power there is.