It's not discussed because it will be in exactly the same place. The only advantage of a longer arm is, if you play a thicker, or thinner, record than your VTA/SRA is set for, the angle at which VTA is off is slightly decreased. Likewise, when tracking warped records, the angle that the SRA is off will be marginally less with a longer arm. The Dynavector arms really have a pronounced change in SRA, as well as having very different horizontal and vertical primary resonances, due to the extremely short arm.
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