I would really like to audition the PMC subwoofers
By the way, what is it that PMC labels as ATL (Advanced Transmission Line), to me they just look like regular transmission lines, some are more folded than others, but in general just different permutations of a TL, in the fact-8 it's stated there is a resonant chamber at the end of the TL that helps to dampen some higher order resonances, never heard of anything like this before, does this work or is it a marketing gimmick....
My issue with PMC is as with many so called high-end brands.
1) A lot of high-end brands use really cheap drivers form companies as Vifa, Perrles, Scanspeak etc to name a few. I would hasten to add that Vifa, Peerless and Scanspeak per se are not bad brands, but the truth remains that in the case of Wilson Audio, PMC, ATC to name a few, you're paying 1,000's if not 10,000's for speakers that use £20 drivers in them.
2) Active Transmission Line: In the above photo, i have seen a modeled such exotic Transmission line enclosures, including Daline T-lines, and Jensen transflex enclosures and their variants. I see nothing special about PMC, couple with the fact that they use cheapish drivers, I've never been impressed by PMC at all sorry Peter. Active Transmission Line is marketing talk, and it mean ... nothing in reality.
For me there's a difference between good speakers and memorable experiences I've had. As many would have, I have listened to lots of audio gear from PA, home audio, personal audio and car audio. In terms of speakers, I have been into self-building for many decades, and find the mass of commercial brand, Monitor Audio, B&W, Naim, Missioin, Whafdale, McIntosh, KEF, Wilson Audio etc, etc, too be laughably at best. I understand the commercial reasons for charging the prices they do, but it would take a lot for me to buy commercial speakers, when i know i can go to parts express, or madisound, pick up the same drivers, the same crossover components, chop some would in my workshop and come up with the same thing or better for next to nothing.
The only 'Memorable' experience I had with commercial speakers where a set of Dynaudio floor standing speakers (forgot the model) However I built a pair of transmission line speaker for my friend, for near an 8th of the price and he got rid of the Dyn's.