Good to hear the speakers are still working well. I was also surprised by the improvement in sound quality when I started using a better DAC - for me it was the imaging that improved the most.

I am always pleasantly surprised each time I listen to M3's and have the same "why would I need anything more ?" reaction.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8