While your remarks are unassailably correct, the real world of plywood makes it easy, cheap, and otherwise feasible to cross-brace while all but inconceivable to provide enough damping to be helpful enough.
B.
there are a lot of "moving parts" in a full up acousto-mechanical engineering analysis - easy to miss things, overstate, few have the experience to balance the issues and "solutions"
but Geddes might be one - his preference seems to be damping bracing and intrinsically high internal damping urethane modeling board panels
he seems to say there is little need for constrained layer damping
maybe that evaluation might change if you do use wood panels without the high internal damping
constrained layer damping is often 3 layer, less often 5 layers, some balance the stiff pair of panels in 3 layer - I think unbalnaced construction and 5 layers could be more material efficient
structural strength of the box, keeping its weight down too for handling are other construction goals to add to the engineering factor's weightings
but Geddes might be one - his preference seems to be damping bracing and intrinsically high internal damping urethane modeling board panels
he seems to say there is little need for constrained layer damping
maybe that evaluation might change if you do use wood panels without the high internal damping
constrained layer damping is often 3 layer, less often 5 layers, some balance the stiff pair of panels in 3 layer - I think unbalnaced construction and 5 layers could be more material efficient
structural strength of the box, keeping its weight down too for handling are other construction goals to add to the engineering factor's weightings
Last edited:
Linkwitz has been talking about panel vibration since the '70s, and does include bracing and such in his sub cabinets.... He's measured the amplitude and has suggested that at resonance, panel vibration may generate more sound than the drivers.
There is no cross bracing in either his Thor or Pluto subs according to the drawings on his web site.
- Status
- Not open for further replies.