I tend to agree with the trend here, but might bump it up to 60-65%. I think the statement that a good room can make bad speakers sound good and a bad room can make good speakers sound bad is right on. I have built a dedicated HT in the basement and spent an enourmous amount of time designing the room to as close to acoustically "correct" as possible. So total cost of my room (materials only, since I did the research and construction) would be about $10,000 (this includeds lumber, resislant channeling and clips, screws, glue, drywall, doors, hardware, carpet, paint, chairs, etc). So this ends up being about 50% of the cost of my whole theater. I haven't tuned the room yet with acoustical treatments, but it sounds great now, and will probably need minimal treatment.
In terms of the other equipment (I'll work off a remaining of 35%), I think it is evenly split between the source, receiver, and speakers (11.66% each). A weak link in any of it can destroy the whole effect. I.e. a bad source equals garbage in, garbage out. A bad receiver is going to introduce errors in processing, delay, etc. And bad speakers are not going to acurractly reproduce the signal from the receiver.
A component that is not considered is the user. I.e. what sounds good to them and the ability to set up their equipment correctly. If it is not set up[ correctly, then you can spend all the money you want on room and equipment and it is still going to sound lousy.
![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
so maybe the answer is 75% user and 25% other (of course you can't put a cost on the user, but interesting to think about)