GrampaDave said:
The V15RS/VSTIII are a mystery. [At 400Hz trackability is 26 cm/sec and at 10kHz it's 56 cm/sec, all at 1.25g VTF.]
So at 400Hz [the V15-RS is] only fair - between an M91E and an M91ED - but at 10kHz it's in V15IV/ML140 territory. I think they pulled an N24H, stiff suspension to beef up HF trackability at the expense of LF. I can't figure out why, if the cantilever was the same Be masterpiece as the V15V. It's troubling. ... Claimed trackability for the V15Vx is identical to V15V.
Off topic but fun topic:
As GDave pointed out, the V15VxMR, though we could say it was based on the V15-RS body and stylus, had a stylus that was more fully developed (though with a twist), which was reflected in its much higher price and better specs. Its stylus is indeed much closer to the predecessor V15VMR's than the V15-RS's. Its problem is that it's stuck in a body with roughly 30% higher inductance and of lesser linearity in the treble than the V15V, which accounts for at least some of the "audiophile" response curve (so "beloved" in the M97xE!). The xMR stylus wants to go in a lower-inductance body-- ideally in a laminated V15V body-- but Shure made that impossible.
As for the lower tracking performance of the RS, we can see that the RS was not equivalent to the original 1982 V15V-HE in all respects-- the Be foil cantilever was retained and so was the V's original HE stylus, but the damping system was apparently simplified; the RS's tracking behavior hints that its design resembles earlier non-V15 damping systems like, say, the N97HE's. It's also less prone to age hardening than its big brothers, hinting at a different rubber formulation.
The RS sold for so much less than the V15VMR when it was on sale for $40 at Radio Shack (veteran Shackers considered the sale price the "real" price), its performance/price ratio was very high. It may not have tracked
quite like the V, but it sounded like the V, and matched well with medium-mass arms. Think of it as a latter-day M97HE playing second-best to a latter-day V15 Type IV and priced (on sale) accordingly.
Let's put it this way: at high frequencies, where it counts, it handily out-tracked any Shure aluminum-cantilever cartridge, including the V15III, to which it is often erroneously (infamously?) compared, and the V15IV.
Here's the spec sheet for the V15 IV stylus (as used in the V15 LT) operated at 1.25g, for direct comparison to the V15 RS specs posted above:
