I helped a friend with a pair of 5's some years back - they really came alive with a Bryston 4B-ST.
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i found the 5b's very similar to the 7b's with regards to needing lots of power to sound their best. 3-4 ohm load won't be the easiest to push hard but you'll be rewarded if you do. you'll need an amp with lots of legs to make these puppies shine imho.
i was using a krell s300i to drive my 7b's and they sounded ok. i didn't hear what they could really do until hooking up my levinson 432. huge improvement with a big bump in power.