Hi All, Here we go! After loads of good advice from members on the forum, research and struggles trying to get the right trades in, I'm starting my home cinema and having a go at some of the work myself. I ran cables a while ago now, 5.1.4 for atmos, cat6 as I was originally going for a TV on the wall, but have now decided to go for a projector/screen set up. So far I've ripped the ceiling down, it was water damaged and had popped off the nails, ripped the carpet up and installed one, yes one, ceiling box for a monitor audio 265-IDC speaker - it was emotional A few questions or clarifications on this. The room is 3.5m wide, due to cable and central heating pipe runs, I've had to step the box in just over 1m, which I'll do the other side - so the atmos speakers will only be 1.5m apart, is this an issue? I'll have a 2m screen, so the left and right fronts will be 1m in as well to line up the atmos, so fairly close to the central speaker - any issue with this? Anyway, the box is 350mm wide, which is the width between the joist - at the base of the joists.... of course the joists are bowed and so the box would not fit as intended, you'll see from the photographs that I switched the orientation and built up one side with some old floor-boarding I had in the garage. First image is some rough cabling a electrician left me with, not chased in! Also, I found a load of blanked off sockets around my house containing this twin cable (see image 192035) just blanked in sockets and no idea what it is for? Would be good to hear thoughts on the space and build as I go, I will probably not get a chance to do more now until the weekend..