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

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.

...and I thank you both, esp. rix....nice link.😉👍

@asvjerry - have you heard riploles?
I am probably leaning towards a pair of sealed servo subs.