No, the M6 is completely different to the M60. The M60 is the analogue active version of the DSP5000 and, I imagine, an extremely good speaker.

The M6 are these. An oddball speaker in the Meridian range, quite innovative in their way. From memory, wife and driver and a downward firing bass unit. I’ve only ever heard them as rear speakers in a surround setup, but I’m not a fan of the wide and mid-treble driver in the 3200s either…

HC: 861v4/ID40/LPS, DSP5000, DSP5000VC, DSP3100, SW1600, HD621, Oppo BDP-105, Sony VPL-HW55ES
2-Channel: TEAC VRDS-7/Trichord Clock 3/PSU, Avondale S100, Harbeth Compact 7ES-3
Previous Meridian: 5000C, 5200, 7200.2, 6000, 562V.2, 568.2mm, 800v4, 808.2i, 818v2/v3, 861v8, 551, 502