Date: May 12, 2001 at 01:10:47 From:Ted McConnell, [cvg-29-17-105.cinci.rr.com] Subject: I forgot to suggest a solution.
I didn't really answer the question.
I would build a minimum 3 cubic foot ported box - bigger the better - with a 15" or 18" driver intended for low frequency sound reinforcement. For a keyboard I might use a JBL 2245 which will go low and not blow - but there are several good ones out there. Shoot for a 40 hz type of box for optimal weight/size/cost.