Of all the amps I have paired with Maggies, including two different 300 WpC Codas, none have paired better than Parasound’s A21 and JC5. The Codas were not nearly as good at driving those current hungry panels. The Codas are great amps for conventional cone speakers, but otherwise it’s night/day when compared to the Parasounds.
One truth I learned while owning Maggies is there is really no such thing as providing them too much reserve power. The higher the power the better. Class D power does not apply however, they need high current Class A/B. For 3.7s, I would want no less than 500 WPC into 4 ohms as a starting point. Ideally, you want an amp that can put out over 1kW during transient peaks. Maggies driven with lesser power sound like completely different speakers.