Room Suggestion

If you're asking which room to use I'd use the basement or the second room. If you don't mind building a room in the basement that would be my pick. That's exactly what I did here. The best thing about it is I used soundboard, resilient channel then drywall then acoustic tiles on the ceiling. This helps isolate you from the rest of the house. I can play my stereo quite loudly without bothering the two women upstairs. Get some bass traps and treat at least all the first reflection points and you'll have a very nice listening room.

Having a sloped ceiling like room number two is good but at 55" is awfully low. The other two rooms are too small unless you listen to low levels and treat it well. Room acoustics/treatment is well worth the money and is a better investment than upgrading electronics.

sadly your best two rooms are very low ceilings, but given the flexibility of an unfinished basement I would chose that over the others. As Warren suggests, you could treat the low ceiling to reduce it's effects.

If you want some help I have a couple of Everest books on designing a listening room. I could give you some preferred dimensions based on acoustics.

jd

JD is right. My basement room ended up being similar to your basement room. There is nothing you can do about the ceiling, but the other rooms are too compromised. The upstairs of a 1 1/2 story house is going to reflect way too much info right back at you.

The basement being unfinished allows you to build a room that takes all of the problems into account. The room can be finished without giving up much if any ceiling height.

Good luck.