Has anyone heard or built an Axel Ridtahler (Ridtahler dipole) sub woofer?


http://jazzman-esl-page.blogspot.com/2011/01/ripole-subs-are-underway.html

I am also researching a Slot-loaded W-frame sub woofer design, has anyone here ever used this design or heard it?

I made an enquiry about using two 12" servo subs and the response was that they are tuned for really only one frequency.
I have heard they will produce a chamber resonance at 200hz-300hz, which is way above where I'd want to cut them off anyway.

I am chasing 20Hz to 35Hz fill in the bottom end with my stand mounts, the servo amp has tunability built in which aught to help integration.
128x128rixthetrick
Hmmmm, W, and H are both used by GR.  They are good from 20-250hz + or - 3 db.  I use them at around 60 and below, if at all.

Good yes, the best no. WHY. Well come to find out the servo amp works because of a program that written by "whoever". If whoever, wrote the program could predict all the overshoot cone issues it would be fine, BUT they can't. The system is faster than accelerometer, servo systems, but nowhere near as accurate. 

The older accelerometer, Bass Bins were the BOMB, close to 3 times the price too.. You get what you pay for.. OB is tough, then ADD servo...
Sure looks good though...

Regards
@oldhvymec - are you saying that the measurements the amp module are fed coming back from the subs are inaccurate?
I do know what overshoot is, and there's no predictive modelling for this scenario that I am aware of, and can't even dream of how it could work.

Who makes a better servo driver combination please? I looked up Bass Bins, many manufacturers sold a product by that name, which specifically are you talking about?

I have a Tymphany LAT and I like what it does.

PS. all the best with your procedure mate - thanks for the reply in here.
@asvjerry - have you heard riploles?
I am probably leaning towards a pair of sealed servo subs.