Thank you AnakChan and rudi0504, unfortunately it is not working for me.
I have rebooted few times and even reset to factory settings twice, additionally, I found the PHA-2 English user manual
http://download.sony-asia.com/consumer/IM/4477124111.pdf and tested it on the PC, iPad Mini, Sony Xperia Z Ultra, the ZX1 (using the stock stereo mini cable), the PHA-2 was working fine.
The only headphone amp set-up that is not working is the hi-res stock cable btw the ZX1 and the PHA-2
... really disappointed.
Using deductive reasoning, I can think of 2 reasons:
1. the PHA-2 male connector for hi-res cable is not working properly
2. the hi-res stock cable is faulty
Do you have notifications of any sort in the ZX1 (usb icon and other), when you connect them with the hi-res stock cable? Is there anyway I can manually turn off the speaker sound, thus, hoping that the sound is forced out to the PHA-2?
How does the sound differ (ZX1>PHA-2) using the stock stereo mini cable vs. the stock hi-res cable?
Appreciate anybody help here, it will troublesome for me to send the PHA-2 back to Japan.
Cheers
SimonT