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In Reply to: Re: Sub Woofers posted by Bill Fitzmaurice on February 7, 2007 at 05:47:38:
What about "The Almighty Subwoofer"? http://member.newsguy.com/~stigerik/almighty/The Almighty Subwoofer uses the JBL 2226 and it does require active filters. But I've modeled quite a few high excursion 15" and 18" drivers that work as well or better than the JBL 2226 in similarly designed enclosures. My current favorite 'bang for the buck' driver is the Peavey Low Rider 15" ($176 @ Parts Express). In a 250 liter box tuned to 20-22Hz it requires a 6db shelf filter to get a flat response. A single Low Rider will do 110db or so at the stated Xmax.
Except for the need for an active filter, what is so bad about subwoofers built like this? Do they sound bad? Does the modeling not work out right? I haven't built anything like this, but I was planning on doing something like the Almighty Subwoofer here soon. I'd like to know why it wouldn't work. My own interest in this is because I was looking at building some high efficiency home theater speakers using pro sound drivers, and a couple subwoofers with pro sound drivers seems to me like they would be a better "match".
Follow Ups:
Ben .. I knew there would be someone out there to at least question the theory, not oppose it off hand. The JBL 2226 looked very bad on paper and so did the P.Audio clone of it. 15" Pro speakers have too high Fs, but P.Audio 18" Challenger Series looked good in 260 L which I think it really takes to get good deep solid bass, not 38.5 mm excursion from a 12" woofer, 2345 watts input in a 1.63 cu ft box, a port that whistles "Dixie" and boosted like crazy to even try to get 20hz. That's nonsense. It takes big to do big bass correctly. Been to a concert lately?
Model the C18-600LF and C18-650EL and have a look. Think 18's are too big, 20hz is 55 feet long. http://www.loudspeakersplus.com/html/paudio_18_subwoofers.html
Yes Bill, I know it takes full Xmax to reach 110dB, but they should run all day long without harm, and that is roughly 5mm with only 100 watts.
Want more dB or cut excursion a bit? Add another. I do sympathize with those that have space problems. It's not my fault that I do have the room (no wife). The space is there if you want it unless the room is 8 x 10.
Ben (others), you might want to read what Steve has to say about his LLT shelved designs. Just because it's shelved does not mean it must be boosted to get flat. WinISD and UniBox are not too savvy when it comes to acoustics. If done right the room will flatten that right out.
Zene
"Yes Bill, I know it takes full Xmax to reach 110dB, but they should run all day long without harm, and that is roughly 5mm with only 100 watts."In room my Tempest loaded THT horn loaded sub does 110dB at 20 Hz with one watt. I'll pass.
The in-room performance of that cab is adequate, but it's an awfully large and expensive speaker. It does prove that pro-sound drivers can be used to 20 Hz, but it also proves that it takes one gargantuan cabinet to do it. Using drivers with fs in the 20 Hz range similar performance can be realized from cabinets half the size and cost of this one.
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