What is "estimate IR delay" in REW?

Use estimate IR delay to the adjust the zero time reference to make the phase graph readable. From the REW manual: Using a timing reference allows REW to eliminate the variable propagation delays within the computer and interface so that separate measurements have the same absolute timing. A Timing offset can be set that will shift the response relative to the timing reference, allowing the time of flight delay to be removed if using a loopback connection, for example. The timing offset can be set manually or from the figure calculated using the Estimate IR Delay function. And: For speakers the delay estimate is based on the location of the peak of the impulse response. Subwoofers have a broad peak and a delayed response due to their limited bandwidth so the delay is instead measured relative to the start of the impulse response. The start of the impulse response cannot be located as precisely as the peak, however, so delay values are less accurate for subwoofer measurements. ___ 💙 Start supporting Sound Design Live today for as little as $5/month on Patreon:   / sounddesignlive   ___ 📈 Get Started with Sound System Tuning - https://www.sounddesignlive.com/get-s... ___ 👨‍🎓 SOUND SYSTEM TUNING ONLINE COURSE - https://www.proaudioworkshopseeingsou... ___ 📕 Books on sound system tuning - https://www.sounddesignlive.com/audio... 🎙 Podcast for live sound engineers - https://www.sounddesignlive.com/pro-a... ___ Smaart® and the Smaart logo are registered trademarks of Rational Acoustics LLC and are not affiliated with Nathan Lively or Sound Design Live. ___ Be friendly Facebook -   / sounddesignlive   Twitter -   / nathandofrango   LinkedIn -   / nathanlively   ___ I love to geek out about the physics of sound. This channel focuses on the growing opportunity for live sound engineers to improve their confidence and consistency through the understanding of the principles of sound system design and optimization. My goal is to make this channel upfront and honest about my success and failure, so you can learn from both. I am always open to suggestions and feedback so please comment on this video or contact me through my site.