Yes there are 2x PCM1702 20-bit R2R Dac in this your DAP. Great DAP! Hifiman had also black version with PCM1704 which is 2001 Texas Instruments 24-bit DAC (Obsolete now).Feel that, as I also have an R2R player. My WM1A is now back to stock Sony 3.02 on region E, I'll give it some time for me to adjust then load FEv2 again. Dawn, Midnight & Project Z all have some reverb issues on Plus mode which I want to take advantage of with the increased power output.
On Classic reverb is better than on Plus.
Note: I dont listening metal and rock music - probably not very suitable for sony wm1.