GrooveMaster II is being sold as a tonearm strictly for low and very low compliance cartridges like Denon DL-103 and Ortofon SPU—but the whole idea of effective mass/compliance matching is mostly nonsense
It's in daily use in my system with a Goldring 1042
moving magnet cartridge. We have also evaluated it with the same AT7V
that we used for the measurements. Despite the supposed gross compliance mismatch, there is never any mistracking even on the most warped LPs. Neither did we notice any undesirable bass artifacts. On the MC side, I've tried it with the old Dynavector Karat 23R.
The subjective audio performance of the GrooveMaster II is a lot better than the measurements suggest. It is, of course, in a different league from the Jelco, despite a similar-looking vibration profile. I think that GrooveMaster's bearing quality and sturdier build play a significant role in the way it sounds.
While not having the resolution, tonal correctness and the outright "steadiness" of our own Prototypes 5
, the GrooveMaster II is somewhat similar in character. It's a bit darker-sounding, and there's some desire for better spatial resolution, but fundamentally it's enjoyable and mostly done right.