Current, Current, Current. I don't own the MG1.6 but I have owned and own other models. Right now I am enjoying the sound with Classe's newest model. I would recommend the CA-200 or 201.
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I own a pair of 1.5's and can highly recommend a Bryston 4B-ST which carries the best warranty (transferable) in the biz and can be found here priced anywhere from $1300 - $1600. There are many other good choices - Classe (as noted above), McCormack, Aragon 8000BB, Marsh and the larger Rotel amps but it has been my experience that Maggies do like getting clean and high powered current (also noted above) so look at a minimum of around 250 w/ch at 4 ohms. You might also try a search here as well as at the Planar section at AudioAsylum where this topic has been discussed frequently.
I bought a Mcintosh 6500 int. amp on Audiogon recently.It came at a good price and i figured i could sell it at a profit if i didn't like it.It puts out 200 watts into 4 ohms so I hooked it up to my new MG1.6s and was surprised how good it sounds.I've owned int. amps from Krell,ARC,CJ and Cary and i have to say i enjoy owning the Mac more than i did the others.Maybe it's the big blue meters.I'm keeping it and i bought a Mac 841 dvd/cd player to go with it.
I agree with Ramstl. Current , current, and then a little more...current. Maggies, like all planar/magnetic panels (Apogees for example) crave it. I have found deeply biased into class A operation work great. Reference Line (yes, they still do exist, look in the manufacturers section), Threshold/Forte (especially a pair of 4a's), older Classe, Pass, Plinius and so forth. I especially like the Reference Line stuff and were designed specifically to drive 3-4 ohm loads. They are "cheap" on the used market...if you can find one.
Tube amplification seems to do wonders for the 1.6. The best amp overall I have used with them is the vt100m2. I found the pass labs and the mccormack dna-1 to a little less alive with them. The CJ-mv50 was wonderful too. If I had to buy something today, I think I would go for a modern day mv-55, cav-50 or maybe a premier 11a. A big reason for these smaller amps is that 1.6qr's tend to drive an amp pretty hard & I would guess tube replacement would take place often. I notice I have to turn the gain up around twice as high to get the same sound out of my 1.6's verses my ap virgo speakers when using the same amp. A vt100 is $300 to retube, and an mv50 is around 100. The mv-55 actually provided better bass than the vt100. The vt100 was superior in terms of imaging and transparancy.