Yes, I regret not looking into that point when that page with detailed specs was still available. I have no idea what the output impedance is for the PHA-2.
I don't even know for sure if output impedance was included in that table of specs from which I only quoted output power.
Today, I've looked for specs, but like you, can't find anything on output impedance.
Yeah, I'm also hoping that anyone who've bought the PHA-2 can chime in.
Obviously, being usb-powered means it's not going to do well with hard-to-drive headphones.
But if the OI is not suited to drive IEMs, I'm just curious what this dac/amp is targetting towards.