- Thread Starter
- #41
This not only seems odd with the tube resonators I use but also with practically every ‘bass-trap’ designed for and placed in a corner.
Don’t you think?
The comments I've heard elsewhere, stating that an absorber should span the entire wall of a room, were in relation specifically to Helmholtz absorbers. No physical basis for this statement was given, and maybe it is incorrect (that is the kind of thing I'm trying to figure out in this thread). The intuitive appeal is that a pressure-based absorber encompassing the entire wall will conform to the entire zone of maximum pressure at the room boundary (assuming for simplicity that we're talking about a fundamental axial mode and allowing for the dimensions of the absorber).
I would think the typical corner bass trap is usually understood to be a velocity-based absorber, which (unlike a Helmholtz absorber) has no frequency selectivity to speak of. It would seem that the advantages of placing these in a corner are that (1) they will act on two or more room modes (eg left/right and front/back), for which the potentially different frequencies are less of a concern for the broadband absorber, and (2) the use of corner-straddling traps allows the absorbent material to be placed further from the wall, which is advantageous for a velocity-based absorber. I have also seen it stated, in a number of forums, that treating the entire wall surface with porous absorber is even better than treating just the corners but that the space incursion becomes more of an issue for a given absorber depth ("better" for modal control but not getting into the possible desire for diffusion and preservation of some higher frequencies to avoid excessive "deadness").
In regards to large tube resonators: I have had trouble visualizing how the relatively small mouth area of a single such device can affect the modal sound pressure that extends over an entire wall. Naively it seems like this would require some non-intuitive "action at a distance". I will elaborate on this in a separate post.
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