classe cav-75 bridged into 4 ohms?

If I remember correctly, the Maggie 1.6s are BiWired. If that's true, then you'd be much, MUCH better off using each of (4 of) the Classe's channels individually in a passive Bi-amp configuration. Specifically, you'd use one channel for the bottom and one channel for the top of each speaker. Speaking in practical terms, this puts less of a nasty load on the amp, while effectively getting much more useable power to each speaker than if you fed it with conventionally with just one "big" bridged channel from the same amp. Hope this helps.
Best, Joe

Try calling Classe and ask them. I used a CAV150 with thiel speakers 1.5 cs in a home theater. Had no problems and according to the Classe Tech the CAV150 would double in 4 ohm loads. The Thiel speakers I have probably run down to 2 ohms at some frequencies.

Thank you everyone for your thoughts. I finally broke down and called Magnepan and asked them about Joe Abrams' idea... confirmed as best option.

Does anyone have suggestions on a good pre-amp to match? Definitely need photo stage, and maybe a dsp (although might by separate HT). I think someone is (or was) selling a Classe 47.5 ...