Pass should do the trick. X-350.5 worked fine in my setup, but my guess is that XA-60.5 should also work.
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As a Sophia 2 owner; and just having re read the Lamm M 1.2 review I agree re. the price. Now I'm not saying if I had the pair in my house---.( I may fall in love.)
I also had the one's before the 2's. I drove them with a pair of CJ 8's. My present power is the CJ 350 ss stereo amp. This was a big step up and no tube aggravation.-- till I can score a pair of Boulder 1050/or the MBL 9008 pair. (So many great hi-buck monos.)
In my search for a new amp for my Verity Parsifals I spent a day listening to the ARC Ref. 110 with the Sophia II's. It was nice but was a bit forward in the upper mids and a little light in the base. This was with the ARC 26 pre and ref phono, clearaudio TT with concerto cart. It was nice but I have heard the sophia's sound a little more solid on the bottom than this set up. Stunning build quality on those Wilson speakers.
I had Sophia I's and tried a bunch of solid-state and tubed amps, and IMO, tubes are the way to go with these speakers. Unlike the Watt Puppies, the Sophias are an easy load and I thought they sounded best using high-powered tube jobs from ARC, Conrad-Johnson, and VTL. Most solid-state amps just don't bloom and soundstage well with these speakers, at least the Sophia I's. The only SS amps I have heard that do at least some of this are Essence amps, difficult to find.
So would you guys think that the Pass XA 100.5 would have enough power?
My Theta's are 650 watts into 4ohms and the Pass would only be 200 watts. Not that I'm an expert in any way when it comes to ohms, impedance, class A vs B etc, but I do know more power is better and the Wilsons seems to want to be playing around 90db or so.
In my search for a new amp for my Verity Parsifals I spent a day listening to the ARC Ref. 110 with the Sophia II's. It was nice but was a bit forward in the upper mids and a little light in the base.
This was mostly due to Ref 110 voicing. I used Ref 110 with Sophia 2s for over a year. Pass X-350.5, which I also tried with my Sophias, gives entirely different perspective.
Madfloyd, for the long term it would serve you well to get Pass XA100.5 if that is what you already have in mind and already listened to them. The actual necessity is more of whether you need the XA100.5 or the XA60.5. I have the later but I listen to all kinds of music. My personal music taste definitely requires private home with good spacing between houses, and quality windows and doors before the neighbors complain. I expect music with distinct bass at 60-85 db, but then too strong a bass unfortunately drowns out the delicateness and subtlety of the music. So what am I to do? However if you are the type that primarily stands up, claps and moves with the beat, then the pair of XA100.5 are for you. My XA60.5 can undoubtly shake the ground, but other people might enjoy shaking the foundation of their houses harder than me.
Are you using the AR Ref 110 or the Pass X-350.5 now? I have not heard the AR amps, but listened to the AR Ref 3 at my dealer's. Different perspective from my Ayre K-1xe, which is more dynamic and detailed and has better base, though the Ref 3 threw a larger soundstage. Also listened to the Ayre KXR, which is the best preamp I've heard to date.
I have not had the same experience as you had with the Lamm M 1.2s. They really sing for me, but I have always preferred the sound of class A amps. I always liked Pass's class A amps as well.
I have Wilson Sophia 2's powered by a Sonic Frontier Power 2 which is a 100 wpc tube amp, running KT6550's and matching SFL2 pre-amp. The soundstage is incredible, both breath and depth. I have read that this combo may not provide the bass some would like, but I am bass forward and it's good enough for me. Jazz, rock, folk, blues and some classical are my listening preferences.
These amps can be had for $2,000 in top shape, not including the pre-amp.