So for PO vs LO does it change the sound or each is totally different application. Right now I use PO for both headphone and connected analogue to my car stereo (which I guess is like an external amp). Should I use LO to external amp ?I am using a SIM Tray eject tool from my smartphones to take out the microSD cards. I tend to always keep one in my wallet just in case.
As for your question about the PO vs LO, you can't really compare them unless you connect the LO to an external amplifier, it isn't made to directly drive IEMs or headphones.
When it is connected to an external amplifier, it really depends on what you connect it to, but I would use DX160 as the main DAC in a large system , and I use it as a DAC for Feliks Euforia , for example, situation in which the DAC is really capable, despite the DAC not being a Desktop ESS PRO chip like the one in DX220, I still find DX160 to have really good overall detail, clarity and staging
I got the official manual by writing to Ibasso, which I cannot find much about PO/LO though maybe I just missed it.
http://www.ibasso.com/uploadfiles/download/DX160usermanuel.pdf