Jazzman53
Member
- Thread Author
- #1
I've just finished building a pair of Ripole subs, which turned out very nice.
The Ripole design was patented by German speaker designer Axel Ridtahler. Conceptually; it's a dipole speaker with its baffle folded around a pair of opposing drivers in push-push configuration. The name "Ripole" refers to a Ridtahler dipole.
Ripoles have a cardioid radiation pattern which tends not to excite the room's resonance modes, and my pair blend quite well with my DIY ESL's.
The woofer cases are 3/4 AA red oak plywood with quarter-round oak moldings along the box edges.
The center C-section is cut from 7/8" white oak planks, stained a contrasting color and aligned to the woofer cases with dowels. The three-part assembly bolts together with (4) 1/4-20 all-thread rods and button-head cap nuts.
The opposing woofers are 12" Peerless SLS's wired in parallel and in same phase (i.e. push-push). Allowing the woofer magnets to protrude thru the side baffles is a unique feature which makes the design very compact.
Another unique feature is that the acoustic impedance of chambers significantly lowers the woofers' resonant frequency (f/s); allowing the speaker to play about 10Hz lower than the woofers' f/s in free air.
The build was a lot of work but they are unique and I really like their compact size and clean, unobtrusive sound.
The bass notes just seem to rise up from nowhere and recede back to nowhere-- completely un-localizable.
I have a CAD drawing if anyone is interested.
The Ripole design was patented by German speaker designer Axel Ridtahler. Conceptually; it's a dipole speaker with its baffle folded around a pair of opposing drivers in push-push configuration. The name "Ripole" refers to a Ridtahler dipole.
Ripoles have a cardioid radiation pattern which tends not to excite the room's resonance modes, and my pair blend quite well with my DIY ESL's.
The woofer cases are 3/4 AA red oak plywood with quarter-round oak moldings along the box edges.
The center C-section is cut from 7/8" white oak planks, stained a contrasting color and aligned to the woofer cases with dowels. The three-part assembly bolts together with (4) 1/4-20 all-thread rods and button-head cap nuts.
The opposing woofers are 12" Peerless SLS's wired in parallel and in same phase (i.e. push-push). Allowing the woofer magnets to protrude thru the side baffles is a unique feature which makes the design very compact.
Another unique feature is that the acoustic impedance of chambers significantly lowers the woofers' resonant frequency (f/s); allowing the speaker to play about 10Hz lower than the woofers' f/s in free air.
The build was a lot of work but they are unique and I really like their compact size and clean, unobtrusive sound.
The bass notes just seem to rise up from nowhere and recede back to nowhere-- completely un-localizable.
I have a CAD drawing if anyone is interested.