why balanced power last before component?


I've been thinking of using balanced power to remove gross noise prior to a Sound Application RLS or Hydra for example.
Any reason why not?
ptss
Some noise does pass between the primary/secondary of a balaced isolation transformer, especially toroid, which just about all the popular units employ. IMO, its more effective to place the other device before the balanced power unit, to act as a pre-filter.
It's quite possible that the filter does not want any potential to ground on the "neutral".
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