Acoustic treatment

I'm using Owen corning 703 rigid 48"x24"x2".

Thanks 

jon_5912:
"The reason I ask about adding smaller subs to a big one is that I, like a lot of people I'm sure, already have one big expensive sub. I would never buy three more like it. I measured the response with the Behringer ultracurve and measurement mic, and equalized out the worst of the problems. I'm not unhappy with it how it is but if I could add a few smaller, cheaper subs and get a dramatic improvement I might consider it."  

Hello jon_5912,
     I think you may have missed my response to your question earlier in this thread. Here it is again:

Hello jon,
    Very good question. I've never tried this myself but I don't believe there's any reason this wouldn't provide accurate, detailed, smooth and natural bass with deep bass extension down to 20 Hz. I suspect, however, having only one sub extending down to 20 Hz might limit the power and impact heard and felt at that deep bass frequency. But It may be possible to compensate by having the volume set higher on the sub that goes to 20 Hz or you could always use two and still be saving money, just a bit less.  
    You should also probably go look and hear some subs, 30 Hz sounds and feels quite deep and may be sufficient for some.

Tim

Geoffkait I would like to understand the bowl resonator you mentioned. I don’t mean to derail this discussion but if you could post a link to what you refer to I would investigate further. Are they examples I can research? Thanks-
mike. 

You can research the original Franck Tchang Acoustic Resonators. Here is one of the excellent reviews in 6 Moons,

https://6moons.com/audioreviews/francktchang/resonators_2.html

Not mentioned in the review or in the patent disclosure is how shear energy and material velocity only in solids is what  reforms compressive waves and actually makes for the differences we hear when various materials and shapes are introduced into an acoustic space. Tom