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.

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

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.

Ha!
Yesterday I surprised the younger workmate who's been assigned to work with me, alas I haven't worked out why the boss is punishing him, but I bet the truth will come out some day.

I was playing music off my phone through the truck's stereo, notice I didn't say hifi system, and I asked him what he liked to listen to? EDM
I cranked up some Armin Van Buuren he was a little surprised, then I played some mash ups and Deadmau5 mashup was a winner. I asked him if he was surprised, and he was. We talked about EDM events we'd been to with Dutch artists and such.

Now I will say that I have EDM on my home server, but generally for listening I like acoustic instruments, but I play some Doof Doof every now and then.

My car system was all about SQ, full time alignment, fully active channel separation into amplifier channel into each driver. European brand components, all sitting in boxes from the move to the US.
So I've come up in the World, from Downunder to Down South (up north, stateside).

I don't own a vehicle, I have personal use of a 2020 GMC Sierra truck from work, it's got some bells and whistles, and no payments for me. Paying down the mortgage at the moment, trying to be a responsible adult, well it's a good cover.

I'm an automation tech, and yeah I hear you on latency during the process loop, but with 4ms cycles, I think modern logic controllers will have little issue with low frequency correction like sub woofers.
You'd have every right to tell it off if it didn't perform with honor, "just one job, you're given just one job!"

sans MOR C/W?

sans = without or not containing, right? The rest is lost in translation to me, I'm afraid.

'gimme' a break, Jake'. ;)

In Australia that translates to, I'm just joshing mate.

Oh, I'm more worried about the mossies and nats eating me after all this bloody rain, and during quiet parts in music I can hear them buzzing - and I don't claim dog like hearing prowess either. Well I hope it's the mossies buzzing, maybe I do have tinnitus?

Yep a dinky di Aussie living in Texas, used to hot and muggy actually. Most Texans are pretty decent, I like their straight up honesty (generally) and take it or leave it, I make no pretence have no fakery nonsense generally. It works for me, and my wife she's straight forward, which works for me.

Enhancements? recreational pharmaceuticals?
Patent No. 6,630,507

I'm madder than a cut snake, crazier than a frog in a sock, so I don't partake. Now if I were in a situation where I was in pain, or seizures, or well there's plenty this 'lil herb can help. Maybe I read you wrong?

What is he building in there, hahaha? I may have read him wrong, I just think it's sport for him to stir a bit - we're all friends in here, far as I see it.
I see it's a MTV clip, I purchased every issue of the best of MTV live, great live acts. Highly recommend if you like live sounding 80's it's magic.

Don't get me wrong, fast bass is my goal too. I just don't doubt it's a capable technology, and I'm seriously looking at it down the road, you know, after some other projects get finished. Like my long over due finishing of the first two QRD17 diffusers I made with solid cherry wood. That has been a project I tell you, splitting the wood on a band saw, joining it, biscuit joining at times, then assembly.

Yeah Texans, they love their country music, which is kinda blended with pop compared to Aussie country. Not really my scene, but if it's clever humor, I can listen no worries.

I am fortunate, and my wife she likes music and dancing, so I get a lot of support and WAF. She keeps coming home with random LP's, she wants me to invest in a vinyl spinner, it's going to get costly I 'spose.

Danager is cool, met him at millercarbon's place.

West Texas, Odessa. I work mostly out of Midland actually. Working out in the oil fields, amazing what I've seen in Texas and abroad. Horny toads, Bobcat, loads of Coyotes, White tails, Prarie dogs, Javelina ?(Mexican black pigs?), rattlers, loads of rabbits and jack rabbits, I think I even saw a Lama or something like it one dusty day. Squirrels, roadrunners, Tarantulas walking across the roads by the hundreds, wild donkey, picked up a good sized turtle walking down a lease road (I eventually put it back) and when I went to Wyoming I saw my first Bison, racoons, wild brown bears even.

I really love wildlife and have been around animals most of my life, used to catch snakes in Australia, that takes a bit of guts I tell you, perhaps foolishness. Not fond of blue bottles or jellyfish - you get stung and I bet the love of them wears thin real fast.

The real story of rix the trick. Nestle has a chocolate drink mixer called Quick. There was a TV advert with a jingle that went Quick's the trick, someone I can't recall who, changed it to Rick's the Trick after the jingle.
I liked it better than speedy, oh I was kinda slowing down the card game we were playing when I was a young fella, and the call went across the table, C'mon Speedy! Sarcasm is currency in Aus.

@ danager - that Decware W032 looks interesting.
I heard some loaded horn speakers recently and they were very good.

For me that bottom octave has been quite illusive and look forward to hearing about how you solved it.

 Me, how I solved it, as in the past tense?
Yeah, I'm waiting to see how I solve it too.

:-) Sorry I hadn't cleaned my terminals before you heard what I have, it has changed for the better.