Three separate systems:
1 - Living Room: 2-channel, old but tasteful SS gear from the late ’80s, Boston Acoustic A40 speakers (wonderful little 2-ways) + cheap subs. This is strictly for casual music during dinner parties & social gatherings
2 - Main Home Office System: Very complicated because the DAC has dual RCA outputs. One pair goes to an excellent preamp/headphone amp (Violectric V281) used as main system preamp + headphone amp. This path goes to an electronic crossover that feeds a big class D amp (for vintage KEF 103.2 speakers) + JL Audio 10" sub. 2nd path is a 2nd headphone amp. 2 people can listen to headphones at the same time on different paths.
3 - Side-System/Home Office: Another DAC with dual RCA outs feeding 2 headphone amplifiers (Headphone listening only).
Years ago I had a much bigger 2-channel system that engulfed the LR of our 1st house. Those were the days...