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

@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 👌

Jerry, I am presuming you've worked with MDF and know that inhaling the fine dust is very much questionable for ones health? I was told it's the adhesives used in it that is the problem, and I'd guess US MDF and good old Aussie MDF are pretty much the same animal. Use a mask, I know by now, I'm used to wearing one (yes, a quip).

The LAT I used in my (almost dread saying it in here, eyes will roll) car. Yes I used a Tymphany LAT in my car's trunk (boot) and I liked that it went down pretty low without vibrating the frame of the car and muddying up what sound quality I could squeeze out of perhaps the worst listening room environment - a glass and metal cabin of a car.

There are those who have used them in stereo systems in listening rooms and there must be reasons why they are not longer manufactured and sold. I am aware of some of those reasons, and I will tell you that they are not a small enclosure solution if you want to get the most out of them.

IB Infinite Baffle, which in a car is a great option if you seal off behind the seats and use the whole trunk. And so they have been overtaken for small enclosure design by other drivers, unfortunately this is not well known.

It is because of the LAT I chose to build my single sub as an opposed twin driver setup, the drivers negate vibrations in the cabinet to some extent.