JBL 4345 Crossover schematic question

High Efficiency Speaker Asylum

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To all who have or know a lot about the JBL 43XX series speakers. I have a question about the schematics.
Can someone please explain the +9 Volts in the schematic above?

4345 crossover schematic (Open in New Window)

Edits: 12/09/15

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Topic - JBL 4345 Crossover schematic question - Cougar 19:48:41 12/09/15 (3)

RE: JBL 4345 Crossover schematic question - Paul Joppa 19:57:16 12/09/15 (2)

RE: JBL 4345 Crossover schematic question - Andy W 11:42:07 12/12/15 (1)

RE: JBL 4345 Crossover schematic question - Fitero 07:27:04 12/13/15 (0)

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