Are you referring only to the signature series? or beyond that? I'm assuming the amp/dac you're referring to is the TAZH1ES? I'm liking the Z1R with the PHA3, and trying to avoid testing out the TAZH1ES. My wallet cannot take another hit with that. Hahahaha...It's actually a great pairing.
I do want to explain that Sony did create an amp/DAC and DAP's to pair with the Z1R but that by no means indicates it's mandated to sound good. It simply means it's how they decided you should hear it.
For the DAP, 1A or 1Z with Z1R?