The power rating on the speakers is almost irrelevant. The values given are not how much power the speaker requires, those are simply what it is capable of handling. With it being horn loaded it is likely very sensitive and with a -3dB of 30Hz, I'd imagine these won't be terribly hard to drive. A typical 30w receiver probably isn't enough as you may have found, but any decent stereo receiver should be able to handle these guys without issue. I'd take a look at the 2ch offerings from Denon, Harmon Kardon and Onkyo for starters.