I have a good sense of what they will be like...my first attempt at speakers.. 42X24X18
They sound really good actually. there is a bad dip at around 50 - 60hz, but I've never heard a driver that has such nice sounding low end in the mid 20's. I'l prolly eventually swap the beautiful 15trxb's for some cheaper Eminences and full range those vintage Ev's.
anyway.. so yeah.. I'm using these are a size comparison. I don't mind the size, but they are low.. I don't listen to music sitting down much.
I'll let ya know what I settle on.