non-parallel walls and their angles

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I'm currently in planning for a backyard control room which i'll be building off a slab once i remove the garage.

I'll be building non-parallel walls. Are there standard angles for the meeting walls that are considered optimal? Or is it the case that the corners should be as shallow as possible (to avoid bass build up) within the parameters of the design? How important is symetry?
The square of the room will be approximately 4 metres by 4 metres and i'll angle the walls within that.
Also, if i was to double brick sections of the studio, is the density greater if they are pressed together or is there reduced sound transmission through the walls if there is some degree of airspace, or even again, should that airspace be filled with a high density material - maybe sand?



thanks.

[AVare]

Start by reading and following this:

http://www.johnlsayers.com/phpBB2/viewtopic.php?t=3231

Then read The Recording Manual from the first page of the site.

When finished that, you include things what TYPE of room you are writing about.

Andre

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got it.
thanks.