When they test frequency response on a cartridge, it is done using a disc that maintains ( or tries to ) a standardized signal level over the entire frequency range at a specific velocity. Such tests should be done using the same test tones but at various amplitudes. This would test the cartridge to verify linear transfer rates with different input levels ( input vs output amplitude ) along with confirming consistent frequency response at various modulated levels. Nobody does this and that's why some cartridges seem to do better / worse than others in the micro / macro-dynamics category.
While Shure's own "Tracking Obstacle Course" LP has quite a few different tests on it, it doesn't test for vertical deflection of the cantilever via highly modulated passages. Why did they leave this out? Because it would be easy to see just how much distortion was taking place using their own reference sources. Obviously , nobody wants to make a product, hype it up for marketing and then give you the evidence to dispel all of their own hype. '
Like i said, sometimes it's not what was said, but what wasn't said and why. Other than that, do you think that most manufacturers pick a random sample and use it as the baseline for all of their published spec's or do you think that they use a hand-selected specimen that really makes their product look like it can dance? This is the very reason why some products don't meet their own spec's when actually bench tested. The mass produced pieces aren't nearly as good / consistent as the hand-selected specimens that the spec's were based on. Sean
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PS... I've had three different Shure V15's in the past and still have one of the V15VxMR's now. The latest version is the best that they have made, but it still has a way to go.