The digital inputs including HDMI sound very good in the Foundation and its easy to implement a sub.
I don't believe the Analog Preamp setting uses the sub.
Input settings can be changed in the on screen display menu.
A variety of audio modes can be applied to digital and analog signals.
Sonic enjoyment if different for people and is influenced by ones room acoustics, needs, components, and likes.
It's only important that you enjoy the sound and not what components you have. 
Ron
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Ron
Processor: McIntosh MX170, Amp: Legacy Audio i-V7, Digital: Benchmark DAC3B, Roon Music Player, Oppo UDP-205, Apple TV 4K, Fire TV Stick 4K Max, Analog: Gold Note Pianosa Turntable, Gold Note PH-10 Phono Preamplifier, Donatello MC Cartridge, Speakers: Legacy Audio Signature SE Natural Sapele Pommele, Silverscreen HD Center, JL Audio e112-Gloss Sub
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