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RE: How's this for a listening room?

Skye, you wrote folding door or words to that effect. A folding door MAY be transparent to bass frequencies. The adjoining room will act either as a bass trap or an extension of the room for bass modes, depending on door and wall thickness.

Here is an inexpensive tip:
Phonic sells the affordable model PAA3 RTA. It measures 30 frequency bands, RT-60, absolute phase, also has memory and AVG functions, plus an USB interface to store the graphs in your computer. Street price is about U$ 350.
It comes with a test CD. Play the pink noise track in Repeat mode through your system and place the RTA where the listener's head would be, with the aid of a short camera tripod.
With an RTA, you will be able to position the speakers, your chair/couch and bass traps, looking for the most even bass response (30 to 300Hz). Small peaks and valleys are inevitable in any room, no matter how perfet its dimensions.
I like to use with curtains, carpets and acoustic panels to obtain a ~0.6 seconds RT-60 and a declining treble frequency response above 10 KHz, which is the correct response given the distance from speaker to listener and the average in-room high-frequency loss.
Do NOT try to obtain ruler-flat treble response, it will sound bright as hell.

Another tip: while house-shopping, ask the realtor to leave you alone and walk around the room while talking to yourself. If your voice is deep, you will hear the bass modes resonating around your head as you walk. You may want to practice at home first :)
More details: search Wilson room/speaker setup method.
Have fun!

Edits: 05/17/12

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