Charles1dad,
According to Wendell Diller at Magnepan, the reason Maggies aren't more efficient is that neodynium magnets would cost the buyer more than a more powerful amplifier. That being said, they'll work perfectly well for most people with an amp of moderate power. If you want 115 dB SPL's out of them, well, then you'll need a big amp. But most people don't listen at those levels.
According to Wendell Diller at Magnepan, the reason Maggies aren't more efficient is that neodynium magnets would cost the buyer more than a more powerful amplifier. That being said, they'll work perfectly well for most people with an amp of moderate power. If you want 115 dB SPL's out of them, well, then you'll need a big amp. But most people don't listen at those levels.