Comparing the 2 speakers (m100's & a1's) same tweeters, same mids, same 6.5 bass, cabs seem the same ... the only thing I can think that would justify that kind of price difference is an upgragable external crossover board like in the T series... on an other note woulnd't you expect that being involved with all the speakers for Big brand ''high end'' name have an impact on your existing line of speakers... i'm pretty sure that some increases are comming soon...