Acoustic treatment

Interesting thread.... I just installed some helmhotz resonator improvised with long neck bottles and variable water level experiments, and I must say that it was an improvement with my sound....At no cost.... Perhaps not ideal but my ears  smiles... Thanks

About 15 years ago there was a company called Eighth Nerve that I believe duplicated the Room Tunes concept. The front of the panels were a hard surface and the back the absorption fiber glass. They were well built, not very wide, maybe 8" and about 48" tall if I recall. They were mounted at the room seams such as corners and where walls met the ceiling. Their triangles went in the upper corners. I found them to be effective, especially the triangles. I sold them off eventually and these last 4 years got rid of all room treatments in favor of a multi sub bi-amped system.

geoffkait tell me how something the size and shape of a tube trap is going to modify the dispersion of a 32 foot wavelength (20 Hz) in a 15 X 25 foot room. 

Huh? Didn’t you 🔙 post the equation last week? We already covered this last week. Does that refresh your memory?

Here’s a question for you - how can I hear a low frequency sound through ear buds if the wavelength is 32 feet?

Another question fir you - How can several tiny little bowls with diameters of 1” affect very low frequencies in the room?

Another question - How can a Schumann frequency generator affect the sound in the room when the wavelength of the Schumann frequency 7.8 Hz is 25,000 miles?

I done some long time ago with big Kotex pad ( feminine hygiene pad ) and this was the best really I tack it all around the inside and for the rest loose part I put dacron a kind of wadding or you could go like Radford speaker in is opinion he put  some real wool carded it was the best thing I use to have Radford speaker was very good in the time 1972 I gave it to my son still good redone the crossover ..........excuse my english I am french