Bruce,

"A rotary woofers output sums and behaves much like a cone woofer. Adding

a second unit increases output by 6dB. Another interesting aspect is

horsepower. The current model is 1/3 horsepower. We have proved that upping

the power 10 times to 3 horsepower increases the output by 10dB. This

behavior is similar to a conventional loudspeaker. "

It sure is; I stand corrected.

"In terms of "slippage", it is the cone that slips at lower frequencies where the

cone velocity is very low relative to the velocity of sound. Pressure does not

want to build up in front of the cone, it simply slips aside. "

I was speaking in terms of air volume displacement, but I see your point about acoustic output.

Very interesting further explanation of the TRW operation, thanks.

"it is just not practical to construct a round manifold in most installations."

Sonotube is available up to 5 ft dia, but that falls a bit short at 19.6 sq ft.

I guess square is good for the additional area for sound absorption.

And thanks for the thanks