I hear a lot about the Ultimas being hard to drive, but I think this is more applicable to the Salon than the Studios. That being said, they are only about 86db eff. which is the same as my revel F32 which I'm driving quite successfully in a midsize room with a 100 watt tube amp. Most people would probably pick a SS amp for these and I would think that any of the serious offerings from Krell,Bryston,Threshold,Levinson,etc,etc would perform admirably. Consider 150-200W as about a minimum and all should be well. Good luck, these speakers are on my upgrade path bigtime!
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