Me and a dyier friend we tried yesterday to power the KTB from two very advanced linear power supplies (especially the first pic) with no success.
The TB reproduced a very distorted sound.
When powering it with a simpler LPS (with LM chip) or with a iFi iPower though iFi iDefender it worked just fine.
The above advanced LPSes use Texas Instruments and Analog Devices (I think) chips to reduce noise further more.
Both were set to 5,1V/1A. When in use KTB needs about 111mA as we measured.
Any ideas why this is happening Khadas team?