Von Schweikert VR-1; What Amps are People Using?

I keep coming back to the near universal approval of the VR-1's, their great engineering, ultra sweet tweet, and their "big" sound, which seems to be a common description. I am wondering what amplification people are using with them, I notice some tube users, but I am particularly interested in results with a high current amp's effect on soundstaging, speaker control, bass extension, etc. I would like to know if these speakers are capable of giving some real bass weight with bigger amps, (physical limitations acknowledged,) -in my 14X14 room, without the need for a sub. thanks for your insights.