FWIW the 2.2 ohm figure is not a problem for any tube amp because it is at higher frequencies and is not broadband. Its actually more of a problem for transistors that make too much power into that impedance!
The rising impedance at low frequencies also makes the speaker a good match with OTLs. Our local dealer demos his Wilsons with Atma-Sphere M-60s.
The National sales manager for Wilson used MA-1s for years on his Watt/Puppy 8s before getting the Maxx and eventually a set of MA-2s. Soundstage said (with MA-1s):
see:
http://www.soundstagelive.com/factorytours/wilson/
The rising impedance at low frequencies also makes the speaker a good match with OTLs. Our local dealer demos his Wilsons with Atma-Sphere M-60s.
The National sales manager for Wilson used MA-1s for years on his Watt/Puppy 8s before getting the Maxx and eventually a set of MA-2s. Soundstage said (with MA-1s):
No matter what the reason, this system was one of the very best I've heard anywhere.
see:
http://www.soundstagelive.com/factorytours/wilson/