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Phrunesis Author

Level 1

9 points

USB audiointerface drains power even though it is not USB powered

rMBP 2015 + Focusrite Sapphire 6i6

The audiointerface is not USB powered i.e. it uses a small discrete PSU.

However, it still increases powerdraw more than I would have expected, even when the interface is plugged in but not active (i.e. playing sound on internal speakers with audiointerface connected and turned on)

With the device disconnected, I get 7-8 hours of Office use + itunes streaming, with the device connected, I get less than half of that.

Is this normal?

Posted on Feb 7, 2016 4:15 AM

There are no replies.

USB audiointerface drains power even though it is not USB powered

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