Should I do this now or wait...

RE RCA to XLR?

Sounds like a trip to Adaptersville.

I had no problems using RCA to XLR adapter.

See also this previous thread
“bi amping… is it worth it or not?”

http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1154777061&openmine&zzBlindjim&4&5#Blindjim

Maybe you can pick up some ideas in it.

I did. My ideas on bi amping now are a pair of mono blocks. One per speaker.

You may come away with something else though.

Hi Blindjim, you have no issues w/ RCA to XLR inputs? How bout level differences?

Running the X-600's single ended seems like a shame to me. What makes them so special (and expensive) is how well the parts are matched to optimize their sound. Single ended 600's is wasting your $. I don't think you'll have issues(well maybe hum), but you'll never realize the amps' potential. IMO.

The Edge 10.1 NL I replaced my X-600's with sounds much more liquid, has better bass, runs waaaaay cooler (heat was the reason I sold my Pass monos) and is optimized for single-ended operation. Maybe a better fit? FWIW.