room dimention question

Having a low ceiling may reduce reflection times from the ceiling. Consider using insulation between the ceiling framing and completing with fabric rather than drywall - atleast where you would expect reflections from the speakers to the listening position.

Run 3 dedicated circuits, all on the same phase, if you have room for them on you breaker box. If you have the walls open, installation should be easy.

My experience is that the first reflection off of the ceiling has a negative impact on the imaging. The best sounding room for me was a very high ceiling with a vault that is lowest on the speaker wall and goes up as it goes to the back wall. Won't work for you but there are lots of products that address reflections.

The house that I rent has sloping ceilings and the low point in my secondary listening room is about 7' as well. I found that the low ceiling did exacerbate some midrange glare that I already was having a slight issue with. I ended up stapling foam bedding to the ceiling and this remedied the midrange glare more or less. The low ceiling did not seem to compromise soundstage height though I did find that my BG Corp 520 loudspeakers seemed more open and airy in the listening room with the higher ceiling. Unless your speakers approach the height of the room, you probably won't have any issues but, of course, only trying it out will tell. Good luck.

Thanks for your responses. I am thinking about the electrical as I will be doing this room from scratch so anything is possible. I do however need to make this look like a nice finished room. I can't make it look like a dormitory crash pad. So I'll have to finish the ceiling in some fashion.

As far as electrical goes I'd put in dedicated circuit breaker and wire just for your audio. I'd use the heavier gauge that is for 20 amp circuits and use a hospital or other specialty AC receptacle.