You should mate the pre with the power amp and not the speaker.
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I have found the Audio Research Reference range (Ref 3 or 5) of preamps to work very well and is a safe bet with the Rushmore's, which I have been using for a number of years now. The SMC Vre-1 may be better but ultra sensitive to cabling and source components. Surprisingly I have found the older XO Pass pre a bit too bland for the Rushmore.
I too would recommend the Pass preamps, but the OP has given little info. To change the topic slightly, I'm interested to read that there are a few Rushmores out there. I hadn't realized that Pass sold many of these. Could I ask the owners what speakers they compared these to and what they sound like. I have all Pass electronics and have not read or heard anything about the Pass speakers. Thanks.