Well damn there goes the 24. Too many mixed reviews on it. I think their goal was to go after the Empyrean, but it seems like they may have failed. Some owners and others who heard it on the thread like it, some don't. Too mixed to take a chance on this can. As for the 4 vs the 4z I guess I would be willing to take the sonic hit of the 4 vs the 4z for convenience. Weight and ease to drive are in favor of the 4z, in case I get a low powered tube amp for instance or really need to drive this from my Fiio Q5.
Well seems to me that clearly I need to go towards an Abyss 1266 TC. Yes the price difference, but suspect that move would be the last one needed. I have had 2C, 3C, X, i4, and 4z from Audeze. Still rocking the 4z and i4s. Working on purchase price for the Abyss phones... hopefully GSX Mini will drive them ok.