And leak proof?
How about a tiny drill hole to balance atmospheric pressure changes inside the cabinet and out?
If there becomes a large enough gap between inner/outer air pressures can it have any adverse effect on the speaker motor while being driven hard?
A tiny drill hole would solve that. But I'm sure most people aren't wishing for a sub that whistles. If it did as a second result.
How about a tiny drill hole to balance atmospheric pressure changes inside the cabinet and out?
If there becomes a large enough gap between inner/outer air pressures can it have any adverse effect on the speaker motor while being driven hard?
A tiny drill hole would solve that. But I'm sure most people aren't wishing for a sub that whistles. If it did as a second result.
It's actually very hard, if not impossible, to make an enclosure completely airtight.
There are always going to be small leakage holes in an enclosure, e.g., in mounting gaskets, mounting bolts, foam surrounds etc.
Even if the holes are microscopic in size, air molecules are orders of magnitude smaller.
For example, the size of a pore in a rubber surround compared to the size of an air molecule is like the size of a road tunnel compared to the size to a bee!
There are always going to be small leakage holes in an enclosure, e.g., in mounting gaskets, mounting bolts, foam surrounds etc.
Even if the holes are microscopic in size, air molecules are orders of magnitude smaller.
For example, the size of a pore in a rubber surround compared to the size of an air molecule is like the size of a road tunnel compared to the size to a bee!
The problem is "disarming" the rear wave, not the benefits of a sealed box. Lots of stuffing and lots of leaking and you have a superior "enclosure" that does not raise the driver resonance too high.
Villchur (AR-1) wanted to make a "bookshelf" sized box and so leaking wasn't feasible.
I think speaker design has taken some false paths because of the development of theories/models for pure forms (for example, HornResp)... which led to designs which were pure. Modern BR boxes don't adhere to classic tuning theory. Klipschorns have sealed boxes behind the driver. Likewise for sealed boxes, open baffles, TLs (which are better when designed as labyrinths), etc.
B.
Villchur (AR-1) wanted to make a "bookshelf" sized box and so leaking wasn't feasible.
I think speaker design has taken some false paths because of the development of theories/models for pure forms (for example, HornResp)... which led to designs which were pure. Modern BR boxes don't adhere to classic tuning theory. Klipschorns have sealed boxes behind the driver. Likewise for sealed boxes, open baffles, TLs (which are better when designed as labyrinths), etc.
B.
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If you connect a battery to the subwoofer terminals you will see even a perfectly sealed subwoofer is leaky from the cone movement over time.
^ thats how I would establish speaker polarity in auto speakers when I did installs. It saves time and trouble.
No drilling required otherwise.
No drilling required otherwise.