...browsing the post and wanted to clear up some of the questions/comments.

But now I'm just annoyed. They have added a useless super tweeter that no human will be able to hear. Crossover frequency at 20 Khz? They couldn't find any better way to spend the money than to add this useless marketing gimmick? The tweeter and supertweeter crossover is right around 20khz for all models. It's low order and helps keep the system frequency and phase response linear up and through 20khz. On one hand the super tweeter was incorparated as a trickle-down from the top of the line array/K2 speakers - introducing some continuity throughout the JBL line from the flagships through the less expensive models. On the other hand it was something that was desired as much as or more by JBL Europe than in the US. The StudioL line is sold throughout the world, not just the US like the previous Studio series.

they figure that if Monster can make millions selling improvements that no one can actually hear, they should get in on the act too. It's another decision that puts marketing ahead of sound quality
I would disagree. Harman spends millions on R&D and argualby nothing on advertising. Whens the last time you saw an ad for a JBL consumer speaker? I would even go so far as to argue that sometimes we put sound quality too far ahead of aesthetics. Each and every JBL speaker goes through a battery of objective and subjective evaluation for sound quality before it can be approved for production. Every company could do this if they had millions in research facilities but fortunately for us they don't.

....No, totally different situation, the K2 needs the supertweeter, and crossover is at 10 Khz.
....and you think the beryllium 435Be compression driver couldn't have made it to 20,000 if they wanted to? Look at what they did with aluminum on other systems ( 4430 comes to mind)
no the 435Be and 435Ti don't make it to 20khz. They have 3" diaphrams. They were designed from the outset to have maximum low frequency output (down to 400Hz) and not for extended frequency response. The 045Be/045Ti UHF's both have frequency response from 4kHz and on the high end they're 6dB down above 40kHz. The 435/045-based systems are awesome. With the crossover points to the 435 at or below 800Hz in all models the systems really kicks some serious rear end. We're talking extremely smooth frequency response and dispersion throughout; and of course they'll play distortion free as loud as you can take it. The new JBL Synthesis One lineup is also based on the 435/045 horn loaded compression drivers. Just to note, the crossover point between the 435 and 045 is 9Khz.

I'd say there's a difference between 045Be and the monolythic mylar doodah they're using in L-Series.
yes, the 045 is a serious piece of R&D. The Studio L supertweeter has a custom designed phase plug and waveguide but it's not a compression driver. Nevertheless it's a nice UHF tweeter and performs well.

I'll know that their decision was based on sound engineering when I see the same supertweeter on the LSR series.
JBL Professional and Harman Consumer Group are two different companies. While we live next to each other in Northridge and share technology both companies have their own aganda. JBL Pro needs stuff to play loud, be light, and be array-based. The JBL Pro studio monitors are their own thing. Flat frequency response, high power handling with low distortion and low power compression. Not to mention the 6300 series is based on the old LSR28/32 models and uses the 053Ti which has been around for years. The 053Ti does have a nice frequency response that extends past 20khz but it costs $50 to manufacture and is not practicle in the price range of even a studio L series price point.

About the Studio L series in general I'm very happy with how it turned out. Once again JBL has not cut back on the number of models offered. There's a full line of floor standers, book shelfs, centers, on walls, and sub. Also, the enclosure design and build has continued to set some high benchmarks. Harman (with JBL and Infinity) were the first speaker company to start using some beautifully shaped mass produced wood/vinyl enclosures (starting with the Infinity Interlude series) and the Studio L is no exception. When you get close to the stuff they look just as good as they sound...