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When connected to the 2nd usb power terminal, it switches to HP high power mode. Is not this a concept like high gain and low gain of o2? People say there is a difference in output, but when you listen to music at the same volume, there is no difference. And I do not know what PL mode is. After applying PL mode, if you leave the amplifier setting, music playback will stop and the screen will flicker. What does it do?
The difference between bus power mode and high power mode is the amount of current that can be delivered. This does not change the gain of the amplifier, but it increases the audio voltage rails for the headphone amp. With USB2 bus power, you are limited to 500mA from 5V. If you are playing at high levels and the headphone amp tries to deliver more current than bus power can handle, the unit will over current (OC) and shutdown the audio supplies. This protects your USB port from driving more current than it is rated for. High power mode assumes you have a 5V/2A power source connected so the headphone amp can deliver it's max current without the over current protection. High power mode is only really necessary for driving inefficient headphones to loud levels. Bus power will suffice for the majority of applications.
PL sets the power on level. The way it works is that you set the volume to where you want it to be when the unit is turned on, then you enter the menu and activate PL so that it displays "P.L.". The current volume level is now stored as the power on level.