Thanks for the informative posts.Yes, unless he breaks the circuit by plugging something into the FX RETURN of the first amp in the chain -- the Rumble.
It's all right here:
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Here's what the Bassman 500 manual has to say about this:
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On the Rumble series, PREAMP OUT is labeled FX SEND and POWER AMP IN is labeled FX RETURN.
The Rumble's FX SEND works very much like the XLR OUT with the exception that the XLR runs through the cabinet simulator.
