Wikipedia has an article on this. I'd never heard of it before. I guess, with careful engineering (properly matched drivers) it could be something.
I don't quite understand the wiki article -- this sentence makes no sense to me:However the next sentences make perfect sense:Originally Posted by WikipediaIn other words, you can use a smaller cabinet (useful for car sub-woofers) but at the expense of half the efficiency. Your distortion and SPL remain unchanged. And of course if your woofers aren't exactly matched (every driver has a unique impedance curve) your distortion will skyrocket accordingly, since you're acoustically linking two of them.Originally Posted by Wikipedia
On a 6.69" woofer the woofer excursion ("throw") will limit your SPLs pretty severely, even in an acoustic suspension cabinet.
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