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Interpreting audio measurement data - suggestion for an article

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Re: Interpreting audio measurement data - suggestion for an article

Postby Dennis J Wilkins » Sat Jul 27, 2019 6:39 pm

Back from some errands - forgot to mention REW 5.2 will be released about mid-August, otherwise it's still beta (and not available on the REW site which still has 5.19). And as I did mention, using the previous swept-sine measurement files with 5.2 messes up the results (in like manner to Hugh's observations about inappropriate settings and measurements). So if you'd used 5.19 or earlier and have measurements saved in files, you might want to keep a 5.19 version around. Actually, John recently added a check on the file type, and 5.2 will refuse to use older test files, so again, keep an older version around if you want to analyze older test data.

Acoustics are terribly complex and measurements are "touchy" but with some experimentation and patience (believe me, you will need patience!) you can make excellent assessments of a room. And hopefully make significant improvements.

I gotta run again. No rest for the weary!
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Re: Interpreting audio measurement data - suggestion for an article

Postby Dennis J Wilkins » Sat Jul 27, 2019 7:18 pm

Not intending to reply to my own reply, but right after I posted the last message, I received notice of a new REW beta update, 5.2 beta 16, which appears to have more changes than any of the last few betas. I'll give it a run-through soon.

BTW, version 5.19 is perfectly fine to use and wouldn't limit measurement capability in any significant way, but I felt an article should reflect the latest version (which has confounded my progress!). Seems this has happened to me a few times before with other software . . .
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Re: Interpreting audio measurement data - suggestion for an article

Postby blinddrew » Sat Jul 27, 2019 7:33 pm

I did think about taking some measurements of my current room for comparison purposes, but as it would add no value I went outside and dug up more of the garden instead. My back is telling me I may regret this in the morning. :)
Thanks for the updates and the sanguine advice.
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Re: Interpreting audio measurement data - suggestion for an article

Postby Dennis J Wilkins » Sun Jan 19, 2020 8:42 pm

My apologies for the delay . . . hard to believe I last posted here in July, but several factors delayed the article on the audio measurements topic. My original draft was longer than my SOS editors wanted and no doubt difficult to trim, everyone has been busy with editing and writing other reviews, and Room EQ Wizard 5.2 has yet to be released!

As I tested each new beta version, there were mostly small changes/fixes - until about a month ago when the time-domain measurement tools were drastically changed, and I realized the new capabilities pretty much obsoleted the method I had described. Since time domain measurements (sound-decay vs time) is a key topic of the article, and the method I had devised with John Mulcahy's help was a bit tedious, the new RT60 Decay plot and the new T60M measure are a vast improvement to these measurements. So the delay is actually a good thing!

Hopefully REW 5.2 development will settle down soon and the new measurements will provide a faster and more consistent indication of sound decay characteristics. Fixing poor room decay will still require significant acoustic treatment, but being able to measure decay times consistently down to the bottom few octaves will help to determine when you have reached a reasonable compromise (as Hugh had said, room acoustics are always a compromise!).

Hope everyone is having a fine 2020!
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Re: Interpreting audio measurement data - suggestion for an article

Postby blinddrew » Sun Jan 19, 2020 9:12 pm

Thanks for the update Dennis, as it happens I'm still working on my room anyway!
Nearly there though... ;)
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