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Macbook Pro USB high pitched noise


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Have my 2012 Macbook Pro connected with two USB Audio Interfaces, each one on its Macbook USB port:

 

1- Roland RD-2000 (internal audio interface);

2- NI Komplete Audio 6.

 

The output is to a pair of Yamaha's HS5 active speakers.

 

When only one audio interface is connected to one Macbook USB port, all is well.

As soon as I connect the second audio interface to the second Mac's USB port I hear a high pitched noise on top of the speakers normal hiss. If I disconnect the cable, leaving only one USB port connected, the high pitch hiss goes away.

 

Any help on solving this ?

Thank you.

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