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In the early 90's JBL began experimenting with biased capacitors. (Greg Timbers [James B. Lansing Sound, Inc.], Ed Meitner [Meitner Audio])
Reference the links below:
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Bypass capacitors have been a JBL standard for over 20 years now.
Top of the line JBL loudspeaker systems such as the L250, 250Ti, and XPL200 employ 0.005 uF polystyrene bypass capacitors in...
Second generation N112 network as used in the JBL Model L112 12-inch 3-way bookshelf loudspeaker system.
The 0.068 uF polypropylene bypass capacitors have been replaced with 0.01 uF polypropylene...
Second generation N110A network as used in the JBL Model L110A 10-inch 3-way bookshelf loudspeaker system.
0.068 uF polypropylene bypass capacitors in parallel with the mylar and N.P.E. main...
Original N110 network as used in the JBL Model L110 10-inch 3-way bookshelf loudspeaker system.
No bypass capacitors.
JBL began "bypassing" the mylar and non-polarized electrolytic capacitors in their frequency dividing networks beginning with the model L110A loudspeaker system. These bypass capacitors were smaller,...