Thank you kindly Dave. Wow that's some heavy bracing work. The reason that I'm asking is that I've noticed Onken cabinets are generally big in volume which leads me to my question. Is cabinet stiffness the be it all, for me still a question mark cause a good buddy of mine has a pair of Watt/Puppy though cabinets are super tough, there is still some muffiness in the sound at higher play back levels.
Many thanks again
Hmm, to me, 'boxy' refers to 'hollow' sounding, which is dealt with internal damping.
Bracing, mass loading is about ensuring the driver is adequately supported to work at peak mechanical/acoustical/electrical efficiency, so it's about taking the box out of the reproduction signal chain as much as practical, but no amount of bracing will damp out 'hollowness', it will just shift it up in frequency, reducing the amount of damping required [a good thing], though the amount shown in the rendering is overkill unless the panels/'skin' is thinner than the norm.
IME, 'muffiness' is due to heavy stuffing densities with [over] damping increasing with increasing power.
Mass loading is where it's really at though when it comes to getting the most detail out of a speaker, so while the matrix bracing may be overkill, it adds mass and in general a 15" woofer cab requires several hundred lbs of [total] mass to become near enough inert as one skeptic found:
Mass Loading ALTEC A7 VOTT 825 enclosures - drlowmu - High Efficiency Speaker Asylum
Percentage wise, even more for a metal horn:
High Efficiency Speaker Asylum
GM