Many of us are using these Bass Traps panels, made of wood framing and insulation covered with fabric. However, What I've read is that these are more like "broadband" absorbers and are not very strong on low frecuencies. Furthermore, slat resonators are also claimed to be good on low-mid frecuencies.
So, what are really good solutions to treat low frecs? (60-120hz)
- Ive seen "hard" bass traps, typically put in corners, and are built with a round shape covered with light wood . In other words, they are hard surfaces, instead of fabric panels. However, I've not seen ANYONE built this kind of bass traps here or in the web. Why is that?
- Slat resonators in order to achieve very low frecs would have to be built enormous
- What about membrane resonators? Not very common here as well.
Any thoughts?
Question for the acoustic experts
Originally posted at johnlsayers.com, topic 12459.
In general; the more volume of wool used in a (corner) trap, the lower in frq it will absorb.
Yes, they are broadband since they will also absorb frequencies in the mid and high range. To overcome that you can add a non-breathing material in front. Plastic or thin wood indeed. It acts like a low-pass filter as you will.
When going really low you can check out the resonator panels and tuned helmholtz resonators. The panel resonators (pressure trap devices) are not common build on this forum, tho Ethan has great articles on his website concerning just those.
I'm sure he will tell you all about those wonderfull panels. (yes, the LOOK good too ;) )
You can definitely target as low as 50 Hz (or even lower) with broadband bass traps. You need a lot of them, but that still makes more sense than trying to use tuned absorbers. Tuned traps for those low frequencies need to be very large, and you still need a lot of them.
--Ethan
? You read where? 30 cm of rw3 (equivalent to 703) gives flat absorption down to 50 Hz in the diffuse field. AndreMany of us are using these Bass Traps panels, made of wood framing and insulation covered with fabric. However, What I've read is that these are more like "broadband" absorbers and are not very strong on low frecuencies. Furthermore, slat resonators are also claimed to be good on low-mid frecuencies. So, what are really good solutions to treat low frecs? (60-120hz)