They are similar but not the same. Axel Ridtahler (which is a very nice guy by the way) and Linkwitz were in contact when the Ripole came out. Send me a PM if you want to get in contact with Axel.
I do use 2 Ripole subs in a near field configuration.
I've used H-frame dipoles in those measurements.
Nice - what are the woofers
In which configuration, dipole or Ripole? The dipole is described at
I promised Axel Ridtahler (inventor of the patented Ripole) not to disclose details about my construction. You would need to contact him directly at axel.ridtahler [at] kit.edu
Well, there IS a low end This is with a 9dB boost at 24Hz and a 24dB high pass at 20Hz:
This is unsmoothed data and 1Hz frequency resolution
Wow that is funtastic result for such a simple and inexpensive subwoofer config. Where do you cross those subs? Did you ever noticed "sounds coming from the back"? How much SPL at listening position can you produce with those two subs (visaton drivers in H frames)?
This FR is impressive, but remember SPL and low frequency response will be generated by cone area, cone movement and cone resonance. Now nothing is disclosed about the speaker units, so SPL dB is not known and 12" as judged what markus said himself is probably a SLS12 from Peerless. By itself it won't play excessivly high in a Ripole. But be a superb SUB. As Ripoles in fact are exellent OB SUBs with the right speakers.
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