Logic X playback distortion on iMac

I have Logic X on a Mac Book Pro and two iMacs . On one of the iMacs using an Apogee Duet, I get distortion ,both headphones and speakers. Works perfectly on the other two set ups, but this one distorts on all types of audio( recorded, imported, virtual). Any ideas how to further troubleshoot?

Buffer size isn't too low in the audio settings is it?

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