Here's a thread on Vinyl Asylum you might find helpful. The poster/2M Black owner has it mounted on a VPI JMW9 tonearm, and he has owned quite a few upscale MM carts over the years. He considers the 2M Black the best MM he's ever used or heard.
A JMW 9 has an effective mass of 8.7 g, so the resonant frequency with an Ort. 2M Black would be 8.23 Hz, which is in the same ballpark as with the heavier RB300 or OL Silver.
A JMW 9 has an effective mass of 8.7 g, so the resonant frequency with an Ort. 2M Black would be 8.23 Hz, which is in the same ballpark as with the heavier RB300 or OL Silver.