Have been playing with a USB powered DAC. Headphone amp no probs, no noise whatsoever. Switch to Lightspeed and power amp, horrendous buzz and hum. Pull power on laptop and run on battery, silent background.
So aside from getting potentially little time out of the laptop battery, what are my options? The DAC is a Schiit, had already considered their Wyrd de-crapifier which injects cleaner power and disengages laptop power on the USB path, but is there a simpler solution with say a different power supply?
Cheers
Ben