I am back.
I have now been to two concerts at the Hollywood Bowl since its new shell made its debut, and here are my comments:
The good news:
Unlike the old shell, all the players can now fit under the shell, which is a very good thing for the players and their instruments, especially during inclement weather.
I understand that the players can now hear themselves quite well, which was not the case previously.
Sound and lighting equipment are now integrated into the structure, which is more pleasing visually than the previous hodge-podge.
The gestalt of arriving early to picnic (some folks go to elaborate lengths!), the friendliness and diversity of the crowds and listening to a live concert under the stars remains one of the best experiences to be had in Los Angeles.
The bad news:
I detect no difference in the acoustics out front. Tinny highs, muffled lows, generally muddled middles. The orchestra sounds distant, reinforced psychologically, I believe, by their appearance. With the larger shell, they are seated further from the audience and the highest point of the shell is considerably higher than the old one, so there's a whole lot more headroom than in the past.
Still sitting on the fence:
There are four jumbotron type screens now, which allow people sitting further back the opportunity to see what's happening on stage in close up. I haven't decided yet whether this is a good thing or a distraction.