Michael Lavorgna 在他的 DAC Reviews 中提到:
"Here's AMR's Vincent Luke on why I did not hear any change with IsoEarth engaged with my MacBook Pro:
This feature [IsoEarth] works by breaking earth/ground loops that can occur in and around the computer itself or other items in the system (e.g. USB Hard Drives). This can lead to audible hum or buzz or if it is not audible, may degrade sound quality.
As your MacBook's power supply does not have an Earth Connection on the power supply this particular feature will not provide any benefit in your system ....."
請bchsieh兄再幫忙看一下iusbpower的內部電路, 到底有沒有對策可有效解決 USB DAC 和 PC 共地的雜訊干擾問題?