I have the SA-14, and I place mine on custom.
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After much thought, I have placed the filter on my SA-14 on "custom". I have a musical fidelity A300 amp pushing avalon speakers. There were no sparks and no damage to my gear.
I found the "custom" sound to be "different" but I am not sure that it is really "better".
Anyhow, I have left it and have since forgotton about it and carried on listening to the music.
I wonder if that warning exists as a CYA in the event that the digital source is feeding really old or really underbuilt/underdesigned gear? My Philips SACD-1000 has the same switch, and I've been running it in the equivalent to the Marantz custom configuration all along. So far nothing has blown up...