Acoustic treatment

Pretty high profit margin!

Even better!

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.