I think 400 or 500 watts is a very practical amp for Maggies. Still, I've owned MMG's, and also Tympanis. I love the MMG's, which seem to me one of the most amazing bargains in audio. But comparing the MMG's to the Tympanis is like comparing a lap dog to a great dane.
I know someone who has 2500 watts on the bass panels of his Tympani IVa's. He's measured 120 dB SPL's with them! My MMG's started to show signs of strain in the mid 90's. Not to mention that they went down to about 55 Hz, while the big ones go down into the mid 20's. And the true ribbon tweeters are a lot cleaner than the quasi ribbon tweeters.
I know someone who has 2500 watts on the bass panels of his Tympani IVa's. He's measured 120 dB SPL's with them! My MMG's started to show signs of strain in the mid 90's. Not to mention that they went down to about 55 Hz, while the big ones go down into the mid 20's. And the true ribbon tweeters are a lot cleaner than the quasi ribbon tweeters.