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In Reply to: RE: Help Needed Selecting The Right Hi-Efficiency Subwoofer posted by moray james on May 02, 2017 at 20:01:51
Yes, you can. One of the properties of horns is that they can extend response well below the driver Fs. In fact, they tend to work best when the driver Fs is higher than the horn Fc. Realizing a 20Hz Fc using a driver with 40Hz Fs and 78g Mms isn't at all difficult.
Ok I got caught short not providing enough information. I was referring to a direct radiator where the woofer needs to be heavier to reach very low frequencies. This is supposed to be a sub woofer not a woofer. Horn loading the 78 gram fifteen inch woofer is not going to make it into sub woofer territory either. A true horn loaded sub woofer is going to be massive in physical size,that was why I recommended Tom Danley as his tapped horn designs can be reasonably compact.
The THT mentioned above by Don is a 22Hz horn in 18 cubic feet. That's not 'massive' in my book. I've seen reflex that are larger, not to mention IB.
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