I converted a 14x13 bedroom into my HT room.
I have acoustical tiles on the side walls and Bass traps along the back and corners. I also blocked up the window behind the curtain with acoustical absorption foam.
Equipment:
54" Plasma
Harmon/Kardon AV receiver
Emotiva 1000 Watt 5 channel amp
Klipsch R5 towers(L&R)
Klipsch R7 Center Channel
Klipsch SS2 surround and Back speakers
SVS PB12 /Plus 2 subwoofer(2 downfiring 12"s with a 900 watt Crown amp)
400 Disc Sony Blu-Ray/CD changer
The soundpressure levels that I can acheive in such a small space is mind-blowing. It is way overkill but it sounds so good.
Iron Maiden on Blu-ray cranked is pure bliss.