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Post by Hexspa on May 16, 2022 8:37:16 GMT
If it was me, I'd get the low end decay right with sufficient absorption before considering diffusers. 2500ft3 is a good volume but still a small room i.e. modal ringing will negatively affect the bass no matter how much diffusion you put in there. 15-20% surface coverage of 12" fluffy or 4" rigid should get you pretty good decay performance, assuming optimal placement. Make sure to fully absorb early reflection areas within 10' of the listening position. Alternatively, you could diffuse early reflection points and use parallel-mounted or angled panels on the walls and/or ceiling to manage modal ringing. Super chunks also help in the corners. After that, it's up to you how big the 'sweet spot' needs to be which might require more or less treatment.
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TLA
New Member
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Post by TLA on Mar 17, 2024 19:07:39 GMT
Slow Progress but the framing in near finished. The return air duct was relocated to the opposite wall. The framing is spaced for installation of 24" wide rockboard 40 or 60 with a acoustic fabric covering on all wall surfaces The concrete wall in foreground will have total absorption of 3" rigid/1.5"rigid/3" fluffy in original wall. The other 3 walls will be 2" rigid/small space/3" rigid in original walls between rooms. Ceiling plan is for 3" rigid below 12" compressed fluffy in the 12" cavities what if I simply use 1.5 Comfortboard 80(doubled up in 3" locations) as it is available at Home Depot and I'll have to special order rockboard 40/60? 80 is slightly less absorbent then 60 at 500-200hz. So, I'll have 100% coverage. Below 300HZ should have a low low level modal ringing. If ringing exists below 60hz, Helmholtz resonators will be considered.. Objects, pictures and lamps, etc will be placed later.  |
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TLA
New Member
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Post by TLA on Mar 17, 2024 19:15:10 GMT
I'm wondering about 3" depth quadratic diffusers. Low frequency cut off of about 1600hz. Say a reverberation field of 1600-8000hz
Since I will have very little to no reflected or diffused energy below 1600hz, then maybe a diffuser in this frequency range could work well.
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Post by rock on Mar 18, 2024 4:05:51 GMT
Your project looks great! Thanks for checking in.
As I see your open framing photo, I'm reminded that we don't talk much about wiring here so I'll just mention: If you can, keep lights on separate circuits from audio power and make all ckts home runs from the load center including earth grounds. In other words, don't daisy chain grounds. If you need one circuit to terminate to several outlets, use star grounding. If you contract out the electric, seek out a contractor that does electrical noise sensitive audio installations.
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Post by Hexspa on Apr 2, 2024 3:06:13 GMT
I'm wondering about 3" depth quadratic diffusers. Low frequency cut off of about 1600hz. Say a reverberation field of 1600-8000hz Since I will have very little to no reflected or diffused energy below 1600hz, then maybe a diffuser in this frequency range could work well. All I really know about diffusion comes from the EBU white paper I always reference. They call for a pretty linear decay profile throughout the mids and highs except for between 4-8kHz iirc. To me that indicates a preference for diffusion. Given that the bandwidth is just one octave and the frequencies are high, there's no need for deep diffusers if you're going according to them. |
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