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There are turntables with lightly-sprung suspensions, and their suspension can be affected by arms of different weight. But those are just lightweight turntables. Something like a SOTA or an Oracle Delphi provide adjustment for arms of various weights. (The SOTA uses counterbalancing weights, early Delphis used a counterbalancing arm under the plinth. Later Delphis used springs of various rates.) Or you can have a suspended turntable with such a massive plinth that the arm’s weight is trivial in relation to it, such as a VPI TNT.
"As the weight c/g changes with this arm, the suspension will respond detrimentally’What is c/g? What do you mean when you say the " suspension will respond detrimentally?" This doesn’t make sense.
There are turntables with lightly-sprung suspensions, and their suspension can be affected by arms of different weight. But those are just lightweight turntables. Something like a SOTA or an Oracle Delphi provide adjustment for arms of various weights. (The SOTA uses counterbalancing weights, early Delphis used a counterbalancing arm under the plinth. Later Delphis used springs of various rates.) Or you can have a suspended turntable with such a massive plinth that the arm’s weight is trivial in relation to it, such as a VPI TNT.