I know your question is for Clayton, but I wanted to share my experience with the X5 and M3. I own the X5s and I heard the M3s at Linear Tube Audio. The M3s clearly had more bass than my X5s. Period…. I will say, I’m confident the 15” midrange woofer produced good midbass that enhanced the lower bass performance. I like my X5s, but the bass didn’t outperform the M3s bass performance in my opinion.
I had the same exact experience. I visited LTA, listened to the M3's, but then purchased a pair of X5's to use with my LTA Ultralinear Integrated amp.
I would agree that the M3's seem to have more bass but I would say that, to my ears, the X5 bass is tighter, more realistic and in better proportion to the rest of the music. There was a time when I was really drawn to speakers with strong mid-bass but now I seem to favor a more flat overall response.
I liked the M3's a lot but I love the X5s.
I would say that they might be my last speakers ...unless I have to downsize at some point
