Full Room Treatment & Room Correction

boxerfan88

boxerfan88

Well-known member
Confirm chop, flat in-room measurement do not sound good…



In-room measurement that shows bass boost do sound very good indeed.

Personally I find a +4dB gradual boost starting from 200Hz is most pleasant, and have nice mid-bass thump.

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J

Joamonte

Member
boxerfan88 said:
Click to expand...
The way he explained about the wavelength vs the thickness of absorption panel is quite wrong, Sound wasn’t travel just 90 degree into the absorption panel , it entry the panel in many angle which make the traveled distance longer than just the thickness of the panel , 1/8th of the wavelength is also affected
 
boxerfan88

boxerfan88

Well-known member
Interesting points I came across at another forum.

  • So no matter how many subwoofers you throw at the problem, you'll never improve the "speaking range" of bass instruments where clarity and minimal ringing are most important. Below 80 Hz is for the "weight" of music, and movie explosions.
  • But if the loudspeakers have a limited off-axis response such that the wall reflections contain less high frequencies, the comb filtering in that upper "clarity" range will be less severe.
  • moving your head even two or three inches changes the tonality.
  • Learning to appreciate good sound can take a few days or weeks.
  • Early reflections are not beneficial http://ethanwiner.com/early_reflections.htm
  • Bass frequencies are the most difficult to tame in a typical home-size room. http://realtraps.com/art_basics-ht.htm
  • Bass traps http://ethanwiner.com/basstrap_myths.htm
  • EQ is useful only for reducing peaks, not raising nulls. Nulls are not only very deep, but even more localized than peaks.
  • In rooms that are square or cube shaped, low frequency modal peaks are often severe, so reducing those peaks with EQ can indeed help.
  • As acoustician Floyd Toole notes, what we hear most is the raw response. Ringing is a secondary effect, so merely reducing a peak to flatness is a big improvement.
  • In most home-size rooms the low frequency response is riddled with deep nulls. Bass traps reduce the strength of reflections that create these nulls.


ASR haters can skip clicking the link ;)

www.audiosciencereview.com

Perceptual Effects of Room Reflections

If all room treatments were broad spectrum affecting all frequencies equally, I'd agree. But some are, and others are not. For example tuned membranes and bass traps can be tuned to affect narrower frequency ranges than tube traps. By absorbing the energy at the bass mode frequency, they weaken...
www.audiosciencereview.com www.audiosciencereview.com

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boxerfan88

boxerfan88

Well-known member
Interesting reference chart. At very low frequencies, the tolerable modal decay time is quite long.


38-Figure7-1.png



Superimpose on my room measurement.... okay lah... buay pai lah....

2023-06-19-21-21-04-REW-V5-20-14-B.png


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2023-06-19-21-21-04-REW-V5-20-14-C.png
 
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boxerfan88

boxerfan88

Well-known member
Thanks to @kennyluck2000 for sharing... pretty informative video...




And comparing the video measurement (near front wall) vs. my own setup measurement (near front wall) .... so very similar...

Video-Home-compare.png
 
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boxerfan88

boxerfan88

Well-known member
I quote:

Because humans are used to especially low tuned resonances, because in the evolutionary process humans got accustomed to first rocky caves, then houses, then acoustically treated man caves…
Click to expand...

🤣🤣🤣🤣🤣🤣🤣
 
boxerfan88

boxerfan88

Well-known member
If making corrections, all of your filters should be individually audible, otherwise it's not a useful exercise.
Click to expand...

Understanding minimum vs. excess phase and the interaction of different wavelengths in small rooms will help designing filters and diagnosing problems. Learning this side of things, including human hearing, is a far more involved and impactful process than making measurements.
Click to expand...
 
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