Subtle but apparent is how I’d describe it if I’m comparing by switching the Arche between Voltage and Clear modes while music is playing. If I’m just listening to another amp, say, an hour later I would not miss it. Of course it will depend on whether the music you are listening to goes that low in the first place.
See the Focal Arche topic on this forum. Torq does a comprehensive review and while he didn’t know the Arche was changing the output impedance, he did notice the differences in sound among the various modes.
From Torq’s review:
