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When aligning subwoofer phase/delay against mains, a loopback timing reference is crucial.

UMIK mic's latency is different than the interface's DAD latency.

How does this get reconciled or is it not possible with a USB mic?
 

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When aligning subwoofer phase/delay against mains, a loopback timing reference is crucial.

UMIK mic's latency is different than the interface's DAD latency.

How does this get reconciled or is it not possible with a USB mic?

Are you using REW? Isn't this handled by using the timing reference in the measurements before and after each sweep? And, there's the relatively new Alignment Tool.
 

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What about the Acoustic Timing reference, where you select a speaker to output a chirp prior to each sweep? Isn't that how everyone does it, or am I missing something here?
 
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