Thank You. I tried by connecting with external power bank and hook up with mobile phone and it does not work. I connect ME direct to my mobile phone (HTC ONE M8) and it recognises ME but the volume is so small and no point doing it. Not sure what I am doing wrong here. though. Any suggestion? Thank you.
I will need to retry a few setups, but I do not recall any having a volume issue - when you say mobile phone, I assume you're talking about an Android. You may need to use UAPP depending on the phone. There is much more information on UAPP in the thread linked below:
http://www.head-fi.org/t/704065/usb-audio-recorder-pro-uapp-24-and-32-bit-playback-ubiquitous-usb-audio-support-for-android
There is a demo version you can trial. I would give that a try on the phone that is not working.
On the phone that is working but has volume issues, not sure what to recommend. I'm certain you have turned up the volume, which is controlled by the phone - some of the USB DAC/AMP I used did not allow the phone to set the volume but instead used a volume knob on the device. But with the Explorer, I believe it is 100% dependent on the signal from the phone for volume. So the HTC audio interface may be to blame for low volume. If UAPP works on your mobile phone, you can use it and share the same license for the HTC.