I'm proud to say I once got asked to leave a Bose factory outlet store in Colorado.
I was actually genuinely interested in a pair of their smaller speakers (for foldback for our church music group). They happened to be on display in the store and I happened to have time to spend, so I went in and enquired.
The sales person was fine - extolling 'musicality' etc. - until I asked about on- and off-axis frequency response, and polar patterns, both of which matter for the application. At that point, to my complete surprise, he turned quite nasty and asked me to leave.
Bose have a long history of accusations of 'snake oil' marketing. In the 1970s and 1980s they had a range of speakers with movable paddles set into the corners. There was all sorts of guff about how these improved stereo imaging, which, of course, was very unlikely. My father-in-law had a pair, and I tried at length, unsuccessfully to get them to work as advertised. The stereo image remained 'elusive' no matter what we tried.
The item you describe, John, uses a ported enclosure for the speakers, with an impedance-matching folded horn arrangement. It almost certainly uses electronic equalization too (necessary and not unusual, as it partially corrects for the deficiencies of the enclosure). I've no doubt Bose have some patents on it, but the broad concepts have been around for 75-80 years.
Bose have also been accused of buying up acoustic patents to sit on them, and been widely accused of being litigious (to the extent that it features on their Wikipedia page, although the page's discussion has 'editors' trying to get the relevant paragraphs removed). I'd refer you to
these comments.
Before settling on a Bose product, I would recommend you look at similar things from other people, notably the likes of Sony, Roberts and Cambridge Audio (if the latter two have something that meets your requirements). All those I can recommend.
I do have some slight regard for Bose PA, having used it on numerous occasions, especially the 'flowerpot' design (802). It's not outstanding, however and companies such as JBL and Electrovoice have long had better products, IMHO, and (again IMHO) 802s are horrible (unusable) without the companion equalizer box, which used to be hard to get off hire companies!
Again IMHO, their longstanding reluctance to produce technical specs is telling.
E.
PS: I have worded this post VERY carefully!