what to do if your are running two preamp lines to your amps? The answer is: Building a very fine switch enabling selecting your line, in this case between ARC 40 Anniv. Ref. and EMT JPA 66. Just look at the two small black massive boxes carrying fine silver wires inside.
AudioCirc.com 
Super idée, par contre chaque appareil alimente les 2 préampli ?
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Stephane,
yes, all sources can be used. The only issue I have is I do need turning down the volume at the WAVAC amps before switching the knob when the system is on. Otherwise you will hear a click.
best
E.
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