LXmini speaker system

As much as I'd like an affordable version of the B&W Nautilus speakers, which cost between $60K and $90K, someone probably would have started producing such a speaker by now if they were ever going to. They aren't patented, since when B&W tried to patent the principle, they found that someone had patented it about fifty years earlier (see Musical 'mollusc' is fifty years late https://www.newscientist.com/article/mg14920123-400-musical-mollusc-is-fifty-years-late/). It seems to me that the tapered coiled transmission line for the woofer could be made inexpensively by molding it out of special plastic in the form of left and right halves, lining them with special foam, and gluing them together.

Another attractive but probably also quite expensive line of speakers is made by PMC of the UK. They've refined the traditional transmission line concept, of which their Advanced Transmission Line web-page (https://pmc-speakers.com/technology/atl) has one of the most succinct descriptions I've seen .

But there is an inexpensive speaker known as the LXmini (https://www.linkwitzlab.com/LXmini/Introduction.htm), which is based on transmission-line principles, and which according to many reviews, provides amazing sound quality for its price. This isn't surprising, considering that it was designed by the late great Siegfried Linkwitz, an electronics genius with a passion for designing the ideal loudspeaker. If you peruse his website, you'll find abundant evidence of his genius and passion for speaker-design. He had designed speakers even before the ones shown on his site, so he had quite a bit of experience, and the LXmini was his latest.

These are the best LXmini reviews I've found:

A) Stereophile article on an audio show where Linkwitz speakers were demonstrated (https://www.stereophile.com/content/rmaf-2014-reichert-sunday)

B) LXmini review from home theater reviewer (https://www.hometheatershack.com/threads/linkwitz-lab-lxmini-kit-speaker-performance-review.137434/)

C) LXC [LXmini knock-off] page (https://sites.google.com/site/cdenneler/home/lxc)

For more bass, there's the LXmini+2 system, which includes two dipole woofers, two more power amps, and a miniDSP 4x10 crossover instead of a 4x4HD. An advantage of dipole woofers is that they don't pressurize the room, at least as much, and therefore don't excite room resonances as much as typical subwoofers.

The 4x4HD crossover used with the LXmini has two digital inputs and an analog input, which is internally converted to digital. It also has a volume control which is controlled with an optional remote. Because I prefer to minimize conversions between the analog and digital realms, I had to find a replacement for my analog-output lossless player, and after considering many alternatives, decided to use one of my PCs as a music-server. This would allow me to use my collection of music files on 4GB USB flash drives, which I like because they streamline the process of de-cluttering, reorganizing, and defragmenting, and if one of them dies, I don't lose much, considering that each one costs just a few bucks.

For analog purists, there's also an LXmini analog electronic crossover, designed by Nelson Pass, who is famous for his high end audio electronics designs. It's available as a kit for about $200, which is a steal, considering its performance.

The PC has a Toslink output which I'd run to the Toslink input on the miniDSP crossover. To listen through headphones, I'd connect an FX-Audio DAC-amp to the PC. My TV would go to the miniDSP's USB input, and my old analog receiver's preamp outputs would go to the miniDSP's analog inputs, for listening to FM. But whenever I listen to FM, I'm reminded that it's become a wasteland, now that all the good music has gone to Sirius XM.