[jqp]

Thanks, that's exactly the information I was looking for. 

This room is a reconditioned garage, concrete floors, uninsulated drywall, windows and doors in very difficult positions, but not unworkable.

At this point, since I have an idea of what I want, I am thinking about making the new wall entirely out of bass panel traps and diffusion units, which obiously will cost more than drywall, but in the long run will be less costly than placing these treatments over a new drywall wall.  Then I can concentrate on the other walls and ceiling later, with broadband absorbtion and more diffusion.

I was going to say, do yourself a favor and pour a slab floor, but I see its already there. I think that makes for a great "foundation" for eliminating some nasty expensive problems.

[TerryO]

I don't know if this will help, but FIM's Winston Ma (a member of our Audio Club) had a listening room built that is considered one of the best.

Try this: http://www.positive-feedback.com/Issue3/maroom.htm
And this:http://www.positive-feedback.com/Issue3/maroom2.htm

Another member of our Club (Mike Lavigne) had one designed and built inside a horse barn. It's also considered very good, which I can personally attest to.

It's here: http://www.positive-feedback.com/Issue16/lavigneroom.htm

Best Regards,
TerryO

[bassboy]

Jqp, it certainly is concrete, although I'm not sure how thick, and it is sloped towards the door a bit as garage floors sometimes are.  Hardly noticable. 

TerryO - all I can really say is wow.  Those rooms are WAY beyond my means but there are some GREAT ideas in there.  You`ve got me rethinking the room division plan, those large rooms are gorgeous.  Maybe I can convince the concerned parties to place the freezers in an outbuilding.  This would mean lots more area to treat, and I would have to fetch frozen goods on demand, but it might be possible.  I have at least a couple of days to figure it all out.

By the way, I moved most of the contents of the room into temporary storage, just so I could set up the system along the short wall.  This alignment seems to yeild at least 100% more bass.  Not nearly as much as in my previous much smaller room, but at the same time it`s MUCH more balanced.  It takes a lot more power to reach the same bass levels as the small room, but reducing the peaks and nulls significantly has really been worth it.