Anyone Else Running Two Systems?

Yes, but not the duplicate type.

My SS system runs 89db speakers with medium powered electronics targeting fidelity and an extremely low noise floor.

My 100db speakers are used to discover tube midrange magic starting with flea watt SET amps.

Not counting my newly purchased Bluetooth shower speakers 😉

I have a "dual" system in my room: a "main" system with 300B monoblocks, and another type 45 amplifier with Lowther speakers on a different side of the room.

I love the sound both systems are able to offer: I realised that one system, no matter how fancy or expensive, will never be perfect for all types of music, but with two you can get a bit closer.

I am actually running three systems.  The first is my main system, which I consider to. be "upper mid-fi."  My second system, in our bedroom, if far more modest--the entire system costs less than most of my main system individual components--consists of a Rega Brio integrated amplifier, Paradigm Premiere 200B speakers, and a Wiim streamer into a Schiit Mimir DAC.  It provides very good background listening.  My third system was kept because it sounds so good and would bring very little in a sale, is in my office; it is made up of most of my 1990s main system, consisting of Infinity Modulus satellites (EMIT tweeters) with a DefTech Supercube 6000, an aging NAD 356BEE integrated amp, and another Wiim streamer feeding through my old Bifrost 2/64 DAC.  It provides excellent sound while I do household business and write letters.  Cabling for the two "secondary" systems is primarily Blue Jeans Cable, which I find to be quite adequate for these systems.

I have perhaps 4 systems.  My (apologies) "reference" system is in my living room (see my virtual system) and is where I go to listen. I am still tweaking this, trying to find the perfect amplification.  How do I combine best qualities of my 2A3 SET and C-J 62SE?

The 2nd system is in my open plan kitchen/dining room and is used while I am cooking and for dining.  That system is Eversolo A8, Elekit 8600 (NOS tubes, Lundahl etc. upgrades) and Harbeth P3ESRs.

My wife has an Eversolo Play CD with Dynaudio Focus 160 speakers. She sometimes like to listen to jazz singers (Norah Jones et al.) and 80's soft rock.  

In my TV room the TV and BluRay feed an NAD D 7050 with Audio Physic Sparks - taken over from my daughter when she took my Virgo IIs after I retired, and sold my NYC apartment.  

Three systems for me with my main (A’gon posted) system in a second living room/rec room, a second system in our main living room (AV and music), and a third outdoor system with three zones (porch, pool deck, and garage) that are managed by a very cool, very old Rotel speaker selector that manages impedance when multiple zones are playing at once.  The outdoor system is powered by a pair of Cary MB500 monos, a bit of overkill but lots of fun.