It is. But so are the claims of car bodies acting as PR and such in other threads. Maybe Steel sheet metal cabs by that logic?
Does the cube have less of this cancellation over the sphere? Kettle drums and cajun drums do not seem to suffer cancellations but rather sympathetic reverb adding to the struck skin
Can the use of dynamat be useful? In the way it damps the HF and seems to be augmenting LF output in the discussions on why the car sub was so loud? A dynamat and rubber sheet cab over a frame? Akin to the duct tape damped kick skins but on all sides except for the base and baffle
I really can't speak from education on this, but intuition from developing composite tapers says that the system resonant frequency would be dependent on amplitude and will shift with the power of the input
Which leads me to now imagine a rubber cone as the cab, filled with stuffing to keep shape and driver at the entrance. Would this rear output reflect and delay of the room walls and add to the driver? Capped or uncapped cone end?
No, not too many cones talking 😀
In the posit about a driver mounted in the opening of a balloon, the cancellation is not from the shape of the balloon, but the fact that the surface of the balloon would expand and contract with so little resistance that it would be as if there were no balloon at all, allowing the out of phase back wave to escape the balloon enclosure. The cancellation is from the front wave and back wave both being available to your ear, varying in phase dependent upon your location. Directly in front of or behind the speaker would avail less of the opposite phase and have more bass, positions beside the speaker would allow pressure waves of opposite phase to reach your ears simultaneously, more or less cancelling.
A sphere would be a perfect pressure vessel for containing a speaker. Spheres are typically used in pressure vessels, because a sphere will not undergo structural deformation, but rather only material deformation under pressure. What I mean is that a cube subjected to pressure will want to bloat, a structural deformation where the structure bends and attempts to change shape to be closer to spheroid. A sphere is already in the perfect shape to rule out any change in structural shape, but attempts to inflate, which would try to stretch or compress the material itself, which is much harder to do than to bow a flat material. I have seen speakers enclosed in spheres, and they are rather stylish, but impractical to manufacture.
I don't think the body of a rigid drum reverberates. I know a bell will, but it is struck from the side. Aren't kettle drums sealed?
This is one of the movements that I was pondering about to exploit to add to the output rather than damp with braces or super rigid panels
This is the movement that I mentioned with the balloon
There is reverb in some drum shells. I have a prized kick, an old two-tone lacquered Legend that I shortened and tuned to a very dry short dub type kick sound. This doesn't use a shell wrap, so the reverb in shell can be clearly felt. There is a difference in the sound of a clay and metal hand drums of similar sizes, one can tell which is which. While a double bass doesn't have a struck skin, it surfaces do act as a speaker
Makes me wonder how would a double bass body go as a cab for a decent lil 8"
there are physical limits for passive radiators:
if their size gets bigger their moving mass must increase for a given frequency
the passive radiator can get so heavy you fear long term stability of their suspension will suffer
if their size gets bigger their moving mass must increase for a given frequency
the passive radiator can get so heavy you fear long term stability of their suspension will suffer
