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REW considerations for time-aligning drivers

If you're using REW to time-align drivers, it's helpful to use a mic/soundcard combo that allows for a loopback timing reference. Generally this involves an external USB sound "card" with an XLR measurement mic.

Nowadays, USB mics are popular, but they don't allow for a loopback timing reference. What REW does in this case is to always shift the peak of the impulse response to t=0, which then removes any actual delay differences between drivers.

If you only care about the combined response and don't care about getting accurate delay information for each driver individually, then a USB mic is fine. For more information, see the thread Can REW predict 2sub performance from single sub measurements?. It's about subs, but the ideas are the same. The poster JohnM is John Mulcahy, the author of REW.


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