Fostex BK-16 Folded Horn Kit

It's nice but you may end up buying other drivers...Lowther, Merrill or ???

If you want fun, my Merrill Zigmahornets are great. Tiny footprint, amazing bass for a 4" driver too. Do a google search and you can find plans and reviews on 6moons.

I actually built these speakers a few years ago. I've been using them with an older NAD receiver and surprised at how good they sound. I'm sure they'd be a great match with a tube amp also.

Thanks for the replies! I think I'll eventually build a pair. They are pretty inexpensive and I'd like to try a full range, crossoverless transmission line just to see what they are like. Btw, those zigmahornets look pretty awesome, just too far beyond my woodworking skills...