Does the esoteric have a digital out? You could run a digital cable to an inexpensive DAC for your second system.
Searching RCA U-splitters
I am using my listening room as a fitness too. So I have two systems there - one more sophisticated for listenning and one random to distract me when I am running the tredmill. But the digital source is just one - Esoteric CD-player. It provides a signal for two separate amplifuers and two pairs of speakers. So I have to plug 2 RCA U-connectors in it and I am looking for 2 good quality connectors. Each one should be one male to two female connectors. Can you help me with Internet address for shopping because I didn't see any here. Best.