Interesting results, Randy. With the two 350s daisy-chained, no problem, as was expected. However, with the 600 added to the daisy-chain, the issue previously described appears, for reasons difficult to fathom. Adding the 600 would of course further lower the overall impedance of the setup because of the parallel nature of the connection, but this wouldn't seem to be so critical. Possibly Ian can shed some light on the 600's operation, as was mentioned in a previous post.

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Enjoy the music, not the equipment.