They are upgraded from the originals and still use the ten" woofer crossed low over to the tweeter. If I didn't love my Pi's I would buy these in a second; make that a New York Second!
But the Theater 4's are pretty hard to beat; although I have yet to try the mods Fred suggested.

• http://www.SEAS.co.uk/acatalogue/speakers_kits.html

Based on the freq slopes of the drivers, I'd assume the crossover is a 2-way first order with some attenuation for the highs.

I am sure it would sound ok. My guess is eff would be 89 db for hte unit, and it should sound pretty good with a 10-20 watt tube amp.
The price including cabs is around 750 pound sterling, which is close to what, a grand here? PLus shipping?

Sounds like a good deal for someone looking for a moderately eff unit.
-akhilesh

They were so popular that you are bound to find a local pair in nice shape on eBay within, say 3 months and you won't have to worry about shipping.

But hey, i'm a vintage head -- to me there is some voodoo magic with what makes the Dyna A25s sound so natural.. they had no business sounding as good as they did back in their day - they'd sound even better with a slightly increased enclosure size (that would be a really worthwhile project, using the original drivers, with maybe just a twweter replacement and building new cabs).

Seas makes great drivers.. so they may sound great -- i just wonder if they'll improve upon the old magic and the orig. with the new tweeters sounds brilliant (i run some in my office system).