Primary by imaging (it very loaded word), x-force generating, dynamics, some dynamic qualities of dynamics, articulation, musical accents, musical time distortions and so on. Do not forget that when you balance VTA tonally you make your cartridge to cure the imperfections of the rest of your system but you should not care about a crappy system but only about the cartridges-record interface. A properly assembled, tonally neutral system will accidentally (?) yield a proper tonal balance in the same VTA point where the optimum imagingabilety (along with the rest parameters) would be reached (actually they all come together into one single point). In many instances for some people it is difficult to understand the imaging results because they deceived by the tonal distortions but with a certain experience and, the most important, with an ability to interpret results it is perfectly possible. Tonal accurateness is very tricky, mostly misunderstood by audiophile awareness, abused and generally non-essential part of audio reproduction... :-(
Rgs,
Romy The Cat
Rgs,
Romy The Cat