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In Reply to: RE: Help Needed Selecting The Right Hi-Efficiency Subwoofer posted by Don Reid on May 02, 2017 at 18:42:15
a good horn will boost the output of a woofer by as much as 10 db but it does not change the efficiency of the woofer itself (no box does). So a sub woofer by design is going to be a high mass device so the the resonant point will be low that is the intention of the design,you cannot make a 78 gram cone driver into a sub woofer. Sorry if I generated any confusion. This means that you need to take into account the quantity of bass that you want to generate and choose a design which will get you where you want to be so far as the bass output goes.
moray james
Follow Ups:
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.
moray james
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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