Room acoustics


How about a thread on room acoustics and ways to improve the in-room performance of your system and its speakers? Subjects covered could be the physics of room response, measurement of response in your own room, and how to deal with imperfections, above and below the Schroeder frequency, like damping, bass traps, speaker positioning, (multiple) subwoofers, and dsp equalization. Other subjects could be how to create a room with lower background noise for greater dynamic range, building construction, or what to do in small rooms.
I am a bit busy just now, but as soon as I have time I will try to kick off with some posts and links.
willemj
REW is indeed very good. And to see what is going on the waterfall graphs are most instructive. They show that peaks are not just peaks but are also an issue in the time domain, by lingering on and giving you that feeling of ’slow’ bass.
For those of you who only use a computer as a source (as I do in my home office), equalization is very easy. Just ask REW to create an equalization graph of the range below about 200 Hz and download that file into the Equalizer Apo software on your computer (aided by the Peace interface). Make sure that you turn off the default shelf filter that boosts the bass, if you want a flat reponse.
In my case I was using my Harbeth P3ESR mini monitors as desktop speakers (with the tweeters raised to ear height by IsoAcoustics desk stands). Unfortunately the proximity of the desktop still created a little bass hump that I could equalize easily for a rather tighter and cleaner sound. If you use more sources than just your computer, you will have to download the equalization file into e.g. a miniDSP and fit that somewhere in the signal chain.
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I agree it regards to treating the room, not the signal. But I'd imagine both are valid solutions with their own particular compromises. 

The waterfall graph is exactly what I've been looking at.. a very useful data visualization. What is considered an acceptable decay time for bass? I've also discovered a dip at 2k.. hmm
I’ve yet to build one, but for bass absorption, the limp membrane trap seems ideal. A member on here also recommended it to me, without me having mentioned that's what I was considering.

https://www.gearslutz.com/board/bass-traps-acoustic-panels-foam-etc/743040-tims-limp-mass-bass-absor...