MaxwellsEq
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That is almost certainly true. If you want to avoid ground loops, have only one mains cable, no external connections (unless optical) and passive speakers. An all in one system should have no ground loops. The more mains-powered boxes you have, the more likely it is that there will be a ground loop.perhaps Dac-amps tend to better prevent ground loop between the components they're connecting
Studios have hundreds of mains powered devices. They avoid ground loops by making everything work balanced/differential.