Perhaps you haven’t heard Melamine acoustic foam, SONEX or foam that looks like SONEX. I acknowledge there might be some kind of foam that doesn’t hurt the sound, I just never heard one is all. Fiberglass is not foam, obviously. Hey, I’m not trying to disparage all acoustic panels. For slap echo Michael Green’s Echo Tunes work great. But SONEX Melamine foam or similar foams - like the foam in Ikea chairs, for example - do actually suck, making the sound phasey and wooly sounding. I can even hear the effect of SONEX when I take it to another room. Ikea chairs - another sonic catastrophe that seems like such a good idea. “SONEX, trusted by professional studios everywhere.” 😛
One final thought: acoustic panels and Echo Tunes and Tube Traps and really all acoustic devices, even tiny little bowls, are trickier than they appear to correctly set up or apply. What is needed is the out of phase track on the XLO CD. The same track used for finding the absolute best speaker locations, which of course change as you apply more and more room acoustic treatment. It’s a fluid situation. Everything is in flux. Been there done that. 😬
One final thought: acoustic panels and Echo Tunes and Tube Traps and really all acoustic devices, even tiny little bowls, are trickier than they appear to correctly set up or apply. What is needed is the out of phase track on the XLO CD. The same track used for finding the absolute best speaker locations, which of course change as you apply more and more room acoustic treatment. It’s a fluid situation. Everything is in flux. Been there done that. 😬