After nearly 2 years of owning the M3s, I finally gathered the courage to drive the volume up on my amp to see how loud they could go. At about 40%, they were really loud. And at near 60%, the color of the sound suddenly changed. It felt as if the tweeters were getting strangled. The sound became very thin and constricted. I didn't dare go beyond this as the speakers were shrieking now.

I thought the M3s can handle about 175W. Assuming a negative threshold of 20%, that still means 140W. My amp is a 50Wx2. Is there something I'm missing here?