Yep, should be good to go! Stax energisers have RCA pass-throughs, so you can easily add them into your existing audio chain. Just need 1 more pair of RCAs.
example: JDS -> Stax252S -> (your current amp)
Oh, this is new to me. I didn't know you could use other amp to hook up with DAC and Stax energizer.
I thought you only need a DAC to hook up with Stax energizer which, the latter is already a dedicated amp for earspeaker.
Is there any reason to use other amp for creating 3-way audio chain?