Had anybody tried this

My last comment is that there are a great many locations around the room, not just behind the speakers, where acoustic resonators are effective. The opposite wall, side walls and upper corners are the best locations. However, I kind of hate to say this, the *only reliable method* for determining locations for resonators like tiny bowls or bells is to use a test signal or two plus SPL meter to map out the entire 3D space of the room, finding points on the walls or wherever when the sound pressure is 6 dB or higher than the average sound pressure level in the room. All other methods will only get you part of the way or even make the sound worse than before. Especially when you put up a bunch at one time. Even the listen a little, move a little technique cannot compete with the SPL meter and will only find what we call a local maximum, at best.

Without a plan it’s like trying to solve ten simultaneous equations in twenty unknowns. The bells can hurt the sound in most locations. The trick is find the right locations. Three bells in the right locations produces better results than twenty bells placed arbitrarily. 

You will know when you’re going in the right direction when bass performance improves.

Ah, lazy and rich. A fortuitous combination. 🤗

The hurrier you go the behinder you get.

Just to mention that there are actually rules for how to place the bells for max benefit. Placing bells silly nilly can actually hurt the sound just like placing tube traps or any other acoustic device silly nilly can hurt the sound. Upper corners and first reflection points are good places to start. One bell at a time then listen. Otherwise it’s like trying to solve ten simultaneous equations in twenty unknowns.

roberjerman
FES - Flat Earth Science. As effective as painting your room’s walls a different color!

>>>>I’ll go out on a limb and guess that’s two things you’ve never tried. The color blue for walls and the color green for the ceiling are best. Ironic, isn’t it? You know, what with blue skies and green fields of grass. Blue skies, headin’ my way....

Everybody and his brother (and sister) has been knocking off the original Franck Tchang tiny little bowls (has it really been 15 years? OMG!), bells, whatever, including your humble narrarator, Synergistic Research, Ziplex or whatever their name is and every avid Hyper cost-conscious DIYer that figures out he doesn’t really have to fork over three thousand clams to see if these tiny little bells do anything. One hint: the dimension of the tiny little bowl resonators not only corresponds to an acoustic wave length but also to an electromagnetic wave length. Hel-loo!