I also have ST/R"s and they positively like lots of power to perform at there best. Mine are stock original with Brians midranges. I run mine bi-wired with a double run of speaker cables from a Digital Amplifier Co. classic Cherry amp with fantastic results.
Mr. Casler had the best solution if using a big receiver, the behringer 500 or perhaps better yet a Crown K1 or K2 fan less amp but only for the bass to about 80hz, both these sound pretty horrid thru the midrange/treble.
Dialed in they love my big Cherry amp!