Tube amps for Horn speakers.......

That first line made me laugh Bob. At least someone else is ok with SS on horns like. But, no, really riley there's nothing wrong with adcom-for what it is. They're not great but i think they're ok and the fact you held onto one amp for 12 years....-4 years is my longest. If you're set on keeping your klipsch you might want to also consider a nice stereo only amp for the same money like johns said, or at least do some a/b comparisons between a single stereo amp and a biamp setup of comparable price and hear for yourself. Biamping can really be good-it just comes downs to specifics at a price point and on better stereo amp v. two cheaper ones? Generally, I'm a bit less enthused with monos though since they don't do much better performance wise and double alot of parts costs (although there are exceptions). The difference between 100db channel seperation and infinite channel separation is not audible. The dyna st-70 recommended above is a good choice and you'll find a never ending slew of people offering improvements to stock versions--soundvalves.com, avahifi.com, tnt-audio.com, and i know there's more in the archives. Its kind of hard to reap the full benefits of biamping w/ passive xovers and no electronic ones. One good stereo amp (and maybe sell the B&K???) plus a little dynamat in the cabinets and on the backs of the horns could wake up the system quite a bit. my 2 cents.