I remember reading back in 1995 about extraordinary results when researchers experimented with subwoofers using a waterfilled chamber. Apparently bass extension of -1dB was achieved at 10Hz with a single 12" driver! Does anyone know what has happenned since?
When I read the topic on the main page I was imagining an 18 inch driver facing in through the wall of the toilet / dunny / john / water closet / loo / lah / bog, or whatever you call it in your country. Somebody *must* have done it somewhere...
There is one thing that definitely wouldn't work: A closed box filled with water ! 
Regards
Charles
Regards
Charles
Perhaps the sound measurement was done in the water? I don't imagine it would be hard to get bass extension to 10Hz in water, as sound propogates well at low frequencies in water. This would not serve us well in a home setting though, as sound does not transfer mediums from water to air very well.
They are doing much research on underwater acoustics at Georgia Tech right now. Almost got a research job working with the underwater acoustics team, but decided to calibrate the semi-anechoic chamber instead.
Austin
They are doing much research on underwater acoustics at Georgia Tech right now. Almost got a research job working with the underwater acoustics team, but decided to calibrate the semi-anechoic chamber instead.
Austin
I don't know what this thing is all about, but in theory one could couple a cone or similar piston to a large membrane using a fluid-filled cavity. The fluid filled cavity would act as an acoustic transformer, trading displacement for area. If the fluid is sufficiently incompressible and the speed of sound through it is high enough compared to the desired frequency range and membrane dimension, it might be an interesting way to build large panel drivers for bass use, but there are some severe disadvantages- like the mass and inertia of the fluid.
More likely, it's just a ho-hum deal like Austin said.
More likely, it's just a ho-hum deal like Austin said.
I wouldn't dismiss the idea out of hand. Loudspeakers are very inefficient-only 1 or 2 percent, usually. If you couple a conventional drive unit to a large water filled bag inside some kind of enclosure, who knows?
There certainly is a lot of room for an efficiency increase there, that's for sure.
Come to think of it, commercial possibilities include the waterbed or watercouch subwoofer. Remember, you heard it here first.😉
But seriously, I think it might not be such a bad idea. 🙂
There certainly is a lot of room for an efficiency increase there, that's for sure.
Come to think of it, commercial possibilities include the waterbed or watercouch subwoofer. Remember, you heard it here first.😉
But seriously, I think it might not be such a bad idea. 🙂
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