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

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.

@fiesta75,
Lots of info on charge coupled networks. See: link below.

/www.lansingheritage.org/

for the DIY crowd, and a hint on why….Wima caps can sound great..

http://www.enjoythemusic.com/diy/0911/charge_coupled_crossovers.htm

STRINGREEN wrote:

Actually, the big JBL is a wonderful speaker.....VPI uses it for the definitive test for their highest end turntables.

For the record, Harry Weissfeld, the VPI founder, loves our Bob Carver Amazing Line Source speakers so much, he purchased them RETAIL because we stopped production (lost money on every pair we sold--required 400 hand soldered connections on each system), and they are his reference in his home.