Hi Bill, the MP-3 will drive any power amp made. I wouldn't worry about the input impedance of the amp.
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Have you thought about a matching atma amp?
The only tubes amps I have owned are atma's, (though I have had several solid state amps) and I attribute so much of the magic my system posseses to the atmas, but of course I have no other tube reference point.
I just read a post here the other day that mentioned that the systems he thought sounded best over the years were all OTL's (diiferent brands including Atma) which seems to validate what I am hearing.
Yes, Emaillists, I'd thought of the Atma-Sphere S-30 but was worried that it doesn't have sufficient oomph to handle the Sophia 1s. I suppose the best bet is to arrange an in-home demo (I find listening to equipment at audio stores too confusing). I love my MP3 and would love to find an OTL that would work well with the Wilsons. Thanks for your thoughts.
JT - I have a brouchure that came with my recent MA1's that lists the MP-1 pre is remote controllable. In talking with the factory, they are working on getting it done, (at least in the MP-1, not sure about MP-3) I believe an MP-1 will have to go back to he factory to get the remote motor option installed, but the mounting posts are already there, at least in MKIII units, I think I remember hearing. Did you see the recent soundstage review of the MP-1?
Essentialaudio (Brian?), I really appreciate your insight -- the fact that you're a dealer only adds credibility to your advice -- presumably you've heard the various amp-speaker combinations and know what works. I'd initially confused (cost-wise) the MA1s and MA2s -- was pleasantly surprised at the cost:value equation of the MA1 MKIIIa. Thank you for recommending them. Until a year ago I'd had no experience with Atma-Sphere -- In addition to his works of genius, I find Ralph's accessibility and warranty policies just amazing. What a great company.