First sound, quiet and reliable. Aesthetix more of a euphonic sound. It depends what exactly your looking for in a system and what you would be mating with it as to which would be better.
The FS is generally quieter although some have had positive results w/ changing the tubes on the Aesthetix. I recently did a comparison of my FS pres del-2 against the Calypso and besides the FS being quieter and perhaps slightly more detailed, I did not find the calypso to warm things up alot, although it did portray images as slightly rounder. I did not hear anything that made me want to change to the aesthetix.
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