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Strange USB audio issue


CJP2
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Since my upgrade to 10.6.4 (now at 10.6.6) I've had issues with my audio. Not wanting to deal with crappy onboard audio from the beginning I've been using an external DAC via USB since 10.4. It seems that when my storage HDDs spin up from an idle state it kicks my audio stream off.

 

Interestingly, if I go into Audio MIDI Setup and adjust the Format from 48000Hz to 44000Hz (or vice-versa) it comes back just fine so my workaround has just been to keep AMS in the dock for a quick fix. I'd sure like to know the root of the issue though and not have to rush over to the confuser mid song or in the middle of a movie.

 

Running vanilla, use BootThink for bootloader on a usb stick, custom DSDT....

 

Anyone got any great ideas?

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