Looking for some help on the best approach for corner bass traps using Johns Manville MinWool Sound Attenuation Fire Batts. Found this for a great price at my local Lowes. It comes in packs of 10 16"x48"x3" Batts. It appears to be comparable to OC703 at similiar thickness (slightly less effective at the very low end), but for the price I paid, I can double stack these and it would still be far more cost effective than a sheet of OC703. These are batts rather than rigid boards, but they do appear to be very solid and easy to work with (more stable and less smelly than Roxul SafeNSound). Here's the sound coefficients from JMs spec sheet for the batts.
I have a false screen wall two feet from my actual wall which I recently added to my Theater specifically for the purpose of hiding sound treatments. Still thinking about how much treatment to put in there along the back wall, but I do know I want corner bass traps. It seems that super chuck traps are more common with softer materials as opposed to corner spans with more rigid materials such as OC703. However, at only 16" wide, I'll end up with super chunks that are 16" on the sides and about 22" on the diagonal (stacked floor to ceiling). Is this a large enough trap to be effective given my material?
The other approach I've considered is cutting the sheets in half and doubling them up to create a 16"x24"x6" block and then tapering the 16" edge and stacking these diagonal across the corner on the 24" edge..effectively spanning the full corner 6" deep with an air gap behind.
The superchunk approach would use about 11 batts to completely fill a corner. The fill would be solid, but less surface area on the diagonal.
The spanning approach would only use 6 batts to fill the same corner. This yields more surface area on the diagonal, but with an air gap behind rather than solid fill.
Given that I have the space to work with, doubling up the batts and spanning the corner seems like the obvious approach to me. Would love to hear input from others in this forum? Is my logic sound here, or will I get more benefit from the smaller superchunk approach?