Many thanks for the replies.

Our original plan was to use Acoustic Foam panels like this: http://images.digitalmedianet.com/2007/Week_52/omk1l6jw/story/004_foam_pieces.jpg
(For clarifciation: I shouldn't have referred to these as egg carton type panels, as we weren't planning actual egg cartons)

From the suggestions above, we should modify this idea to :

- use non parallel walls (by adding dry wall)
- use acoustic foam (I am unclear if this is different than the panels as illustrated above.
- use fluffy clothes hanging 1" from the wall

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Scott,
Foam by mail looks great, and they have a Canadian site too:
http://canada.foambymail.com/acoustical-foam-products.html

>>> Scott: Then you can get some acoustic foam - www.foambymail.com is cheapest place,

Great. For the walls (if clothes are not available), which of the foam products on this page would you recommend
http://canada.foambymail.com/acoustical-foam-products.html

>>> Scott: "and I would also get some of their corner bass trap items. Buy the deepest wedges that you can afford."

They have these bass traps: http://canada.foambymail.com/CBA/corner-bass-absorbers.html
Is the idea that you put one of these on the floor at each of the 4 corners, so you use 4 in total?

Have Fun!
Peter Gannon
PG Music Inc.