A friend told me JBL DD67000 is actually very bad speaker, is it true?

They look like speakers in a box. All these companies using exotic materials including HK, but JBL just keeps getting it done.

A couple 9V batteries in crossover? I just read the D67000 manual and it says the internal crossover has a couple 9V batteries to keep the crossover energized. Has anyone heard of this approach before and does any other speaker manufacturer do this?

Fiesta - Yes Vandersteen has been doing this for almost 20 years…. and with more than 9v
The amps use same tech applied to IC and speaker wires but 128 V
….
trade secret uses in other places…

The 9 volt batteries keep a constant charge on the capacitors in the crossover. Similar to a class A amp where the transistors are always on. (I think this idea came from Ed Meitner.)

Thanks, I'll look up Ed Meitner.