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In Reply to: RE: Bass panels one after the other? posted by j beede on June 15, 2014 at 10:27:44
That's not really an Isobaric configuration since the cavity between is not sealed. This is more of a "compound" dipole configuration ala the Legacy Whisper system.
Unless one of the panels is reversed to create even-order distortion cancellation there isn't much point to it. There is no inherent sensitivity gain/loss nor any frequency extension.
Cheers,
Dave.
Follow Ups:
Ok, thanks Davey!
But it did not quite understand that "Unless one of the panels is reversed..." part, could you explain a bit more? Did you mean putting two bass panels together, both magnets facing outwards, and changing the phase from other panel? Would this be a bit like one push-pull driver..?
You cannot make them push-pull that way. The idea of push-pull is that it is all symmetric.
Ok, thanks Davey!
But it did not quite understand that "Unless one of the panels is reversed..." part, could you explain a bit more? Did you mean putting two bass panels together, both magnets facing outwards, and changing the phase from other panel? Would this be a bit like one push-pull driver..?
Other than the 20.X series, the Maggie panels are asymmetric. So, if you reverse one (transducer or magnet sides facing each other) then you'd have one diaphragm moving toward the magnets while the other one was moving away. You've created a symmetric configuration where (net) even-order distortion has been reduced, relative to a single panel.
Cheers,
Dave.
If there is a distance between the two, let us say a few cm or inches, it will be far from a push-pull driver. A push-pull driver need to have everything carefully aligned and the tension of the diaphragm probably need to be different too. If you put the drivers behind each other, they need to move in the same direction.
If the bass drivers come from a Tympani, they will not be identical.
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