Impressed with the bass performance of PE's Dayton DA175-8 aluminum-cone woofer in Indignia, I wonder how good a TCB (Triple Chamber Bandpass) sub might be made with them:
http://audioheritage.org/vbulletin/showthread.php?t=6289
JBL made a half-dozen versions of these before a threatened infringement suit allegedly shut down the design. The Bose patent has since expired, and the concept is reappearing in some JBL (and other manufacturer) products.
Here's the vintage JBL dual-18" "Monster Sub:"
http://audioheritage.org/vbulletin/showthread.php?t=6782
They also made small ones. This is more what I have in mind:
http://www.jblproservice.com/pdf/Control Series/Control SB-5.pdf
I ran some preliminary sims in BB6P with the DA175-8. Here is the quad-woof isobarik "Other-1:"
And here is the "Push-push" dual-woof "Other-2:"
The response curves are virtually identical; the advantage to isobarik (Black) is smaller box size. While it also has higher power-handling, it is 3 dB less efficient, according to these sims:
http://audioheritage.org/vbulletin/showthread.php?t=6289
JBL made a half-dozen versions of these before a threatened infringement suit allegedly shut down the design. The Bose patent has since expired, and the concept is reappearing in some JBL (and other manufacturer) products.
Here's the vintage JBL dual-18" "Monster Sub:"
http://audioheritage.org/vbulletin/showthread.php?t=6782
They also made small ones. This is more what I have in mind:
http://www.jblproservice.com/pdf/Control Series/Control SB-5.pdf
I ran some preliminary sims in BB6P with the DA175-8. Here is the quad-woof isobarik "Other-1:"
And here is the "Push-push" dual-woof "Other-2:"
The response curves are virtually identical; the advantage to isobarik (Black) is smaller box size. While it also has higher power-handling, it is 3 dB less efficient, according to these sims: