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RE: High efficiency + sealed cabinet?

You are correct. One reason is that a sealed box must usually be larger (2 to 3 times greater volume!) to get the same -3dB bass extension, so nobody wants a speaker designed for a sealed box.

A second reason is the one that hitsware referred to. For a given cone and voice coil mass and resonance frequency, the optimum magnet for a sealed box is much smaller that that for a ported box, so the driver is less efficient.

A third reason is that the excursion required to get a given loudness at the lowest frequencies is much larger for a sealed box.

A fourth reason is that a good design for a sealed box has a loose and floppy suspension, so it is easily damaged when ignorant dorks pour hundreds of watts into the driver mounted in the wrong box - then they complain about the manufacturer.

Nevertheless, I am also very attracted to the idea - the smoother rolloff and reduced ringing are very attractive aspects, as is the immunity to uncontrolled sub-resonance excursions like record warps. The most interesting candidate I've run across is the Fostex FW305, though I have not actually heard one yet. One approach that helps is to design for a Bessel filter response, QT=0.577, or even a critical QT of 0.50. If the resonance is low enough, room gain can bring the bass levels up enough to sound right.

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