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.

rixthetrick... Happy 9/11...if that's even vaguely applicable to to wish upon us all....:(

No, I've not heard one IRL....but I've noticed the Tymphany LAT in my drilling about, and have considered a distributed sub array as an upgrade towards in the future...
That, and the means and methods of woodworking @ my fingertips with the drawings and specs within the 'jazzman' link you posted, caught my interest. 😊  I've a pair of 12" that have no particular pedigree but are available for fooling about with, the hardware noted in those plans, and the means of x-overing in all manner of fashions.

...pretty much consists of labor and MDF...even the latter I have 'on the shelf', the former a matter of debate amongst my spouse and employees. *LOL*

It's been forever since I've listened to any servo LF items, and they were rare to begin with...the complexity of the approach at the time made them a real commitment to those interested....

The LAT reminded me of the ESS Transar I actually got to heard long ago and far away, back in SF at an audio show that didn't repeat itself despite what seemed a good attendance.  The tech didn't really live up to its' potential, which is mho of the early Ohm/Walsh omnis....dipole/omni fan that I am.
We're in a 'better era' for these means of approach, and the riploles intrigue me....ergo my thanks for the link..

What in particular do you enjoy about the LATs'?
Size, response, general 'fit' in your prefs?

Weather here in west NC is Brilliant today....Spring fever in the Fall, tra la lah....*L*

You have a good one as well, Jerry 👌