I just bought a USB tester. I’m going to check the Kemper and I’ll report back. No ground loop noise so far though which was a concern.
|Specifications||Max. Voltage||Max. Current||Max. Power|
|USB 3.0 / USB3.1||5V||900mA||4.5W|
|USB Battery Charging (BC) 1.2||5V||1.5A||7.5W|
|USB-C Current Mode (non-PD)||5V||3A||15W|
|USB-C / Power Delivery (PD)*||48V||5A||240W|
In 2021, USB-IF published the PD 3.1 specification, officially called Extended Power Range (EPR). At the same time, it updated the USB Type-C cable requirements to handle the higher voltage. If you want to charge or power devices such as a gaming laptop, e-bike or laser printer using PD 3.1, you must use a USB-C 2.1 cable.