Anyone else excited for this Borresen subwoofer?!!!

@deep_333 What you just stated to @m-db is marketing hyperbole without any basis in reality. The right term is powerful bass. Powerful bass requires the ability to move a large volume of air in a controlled fashion. This generally means large or multiple drivers with powerful amplifiers that have extremely low output impedances. Most importantly it takes enclosures that do not resonate, rattle or shake. Servo drives are an excuse for poor and undersized drivers in crappy enclosures. 

@mijostyn , I think the nay saying is propagated by some competitor brands who are disgruntled because they can't step over a patent (making you all believe it's mostly marketing hyperbole). In the world of control systems, there is something called a free lunch. In this audio world, it could compensate for a poor driver/enclosure design. But, if the latter is not compromised, it can rise above the rest. Call Rythmik's founder (he's a EE) and have a nerd talk with him. He'll put the EE slant on it and describe it to you. 

Get this book off amazon if you would like to read a bit. If it looks like hieroglyphics from time to time, it could mean that you are missing some pre-requisite.

@deep_333 I am deep into control systems. I have been using room control and digital bass management since 1996 not to mention I design and build my own subwoofers. One of today's excellent low distortion subwoofer drivers 12" and larger, used in adequate quantities for the environment have no need for servo anything.   

Paul McGowan of PS Audio on dismissing servo-feedback in his custom upgraded IRS V bass towers:

https://youtu.be/1OdkRiwmYbE?t=101

Subwoofers from the outset of what are actually physically accommodating designs is the purist approach audiophiles don't want or know how to talk about, because it's inconvenient from the perspective of interior decoration and spousal approval, i.e.: the sheer size of such designs, as well as an area relegated to lesser importance - also in regards to the use of amplifiers and DSP section. What's so hard to comprehend about that?

Those Rythmik drivers are pretty well built, better than a lot of pro sound drivers. I can’t see the idea the servo is just making up for cheap or inadequate drivers. Mine get plenty loud enough. I’m not looking to ruin my hearing, so plenty adequate probably for most anyone in a home setup. 

@deep_333 I am deep into control systems. I have been using room control and digital bass management since 1996 not to mention I design and build my own subwoofers. One of today’s excellent low distortion subwoofer drivers 12" and larger, used in adequate quantities for the environment have no need for servo anything.

@mijostyn Get the highest quality low distortion driver you want...It is still unrelated to the principles behind servo control. You are still asking an accelerated mass to stop passively/ring down without it, which may be good enough with a high quality driver. You are actively stopping it with servo control by letting it constantly track a setpoint.

@phusis Paul’s vid describes the free lunch that he got with initial use of crappy drivers. How about this....Get the low distortion high excursion bells and whistles driver. Now, stack/integrate several of them so they don’t have to move as much for said spl level. Now, add servo control on top of it...it is incremental. It could all be overkill at normal listening levels, but, maybe not, because it is still the highest distortion component in the chain, relatively speaking.

On a related note, I have some coupled cavity speakers, i.e. the physical bass drivers sit inside and are cavity coupled to external radiators (Acoustic filter/ clean bass). One might argue that it is a unnecessarily complicated design. But, the free-er lunch there was that you didn’t need very expensive drivers trying to hit a price point (the expensive driver that may or may not hit a performance requirement just because you kept spending up the wrong tree). I know because i also owned a cost no object conventional speaker design from that same designer...a few different ways to do these things/clean it up, i suppose.