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RE: PLLXO biamp + passive pre-amp on MMGs: a nice little surprise

Neither a series or a shunt-configured attenuator will have a constant output resistance. Thus, the source resistance driving the PLLXO will change with attenuator position and this will also change the PLLXO operation.
This kind of configuration is packed with interactions. (You may remember me commenting about these aspects/trade-offs starting many years ago on this forum.) I'm still not sure folks are appreciating the complicated interactions here. :) An active crossover scheme is much "simpler" in operation.

Your comment about the PLLXO not being able to be generalized to anyone's setup is spot on.

Cheers,

Dave.

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