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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 17:16:39
Some subwoofers certainly are high efficiency. I use Bill Fitzmaurice's HT Tuba folded corner horn subwoofers in my triamplified horn rig. They are good subwoofers; tight, controlled, tuneful, powerful and of quite high efficiency.
Don which HT Tuba are you using and what frequency spectrum does it cover in your system? Also what are you using as XO and do you use an EQ?
I'm listening to: Vida by Cast
Thetubeguy1954 (Tom Scata)
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns --- High Sensitivity Speakers
I use a DEQX HDP-3 DSP for Xover, time, distance, phase, speaker correction room correction, etc. Crossovers are nominally at 200Hz and 8kHz, All slopes are 96 dB/octave. The speakers are tri-amplified. The 24"X36"X36" HT Tubas perform quite well up to 200Hz with the 96dB/8vo roll off above that. I haven't tried them out with more conventional 24dB/8vo slopes.
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.
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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