I’m currently using a AK320 (w/o AMP module, long story short, my 2nd hand AK320 has bumps that screw up the connection with the AMP module).
Looking for a DAP recommendation to pair with my newly acquired IER-Z1R. I’d preferably want one with a 4.4 connection and perhaps with streaming as well. I’m also not afraid to go fishing for options in the 2nd hand market.
In addition to the IER-Z1R, I also use the JVC FDX1, and the Beyerdynamic T1 2nd gen (I rarely listen to that portably though so I don’t think I’d use the DAC that often with it).
These are a few that are on my watchlist as of the moment:
WM1A
Kann Alpha
Lotoo PAW6000
Cayin N6ii
I’ve also considered other non-DAP options to pair with my phone such as:
L&P W2
iFi Hip DAC
Would appreciate any comments and I’m open to any other suggestions!
I can’t comment on the DAP’s you’ve listed as I’ve not listened to them but the DX300 plays real nice with that set…It’s a tier above the iFi Micro iDSD I used to use imho 
