Hi . Yes my walls are sloped just like that . I have the whole upstairs to make into my listening room. Also this is the second owner of these. I will be the third. I asked him if he had the jumper cables and the owners manual and spikes . He said he has a copy of the owners manual and jumper cables but does not have the spikes which i am alittle disapointed. , maybe i can search on line .He was the one that suggested that a moving company move them whole for me, as he said disassemble and reassembling them is possible though. Those were his words. He also said in his texts that " If im not mistaken factory setting mono wire, bi wire, and tri wire. I have never seen anybody do tri wire. As mentioned in the ad ,these speakers are ready for mono and bi wire. For bi wire i will show you how to do it tomorrow. You dont need a special amp, like mono blocks . Matrix 800 is a very efficient speakers . Very easy to push. He said he just came back from the speakers and its gonna be sad to depart . You will be very happy. these are in great shape. I think these are probably in better condition than any other 800s. His exact words. I am so glad i joined this site and met you. You really know alot about these and equipment to go with these. I too wish u lived closer to me ..Im in NJ. I will be seeing them for the first time tomorrow and giving him a deposit until i can get them moved. I saw them on ebay a few days ago with 24 people watching them. I emailed him and said i would buy them and for him to take them right off ebay. I guess he also did that because im on about 15/20 min away from him. I really would like to talk to you on the phone sometime and discuss these babys and some equip. And take some pics of my new listening room and see what u think and give me your ideas. I have to get ready for work now as i work nights in NYC. Cant wait to see tand hear them tomorrow!!!!!!! By the way his asking price is 7700.00 or b/o what do u think and suggest . I was thinking about 7. Ttu soon..Mike