I have looked at the
wiring diagrams for the 2005 Audi A4
sound systems. From what I can tell there are several systems.
"Bose Symphony Concert" -> 8 speakers, no external amps
"Bose Symphony Concert with AMP" ->14 speakers, ext. amp for some rear
"Bose Symphony Concert with BOSE" ->19 speakers, ext. amp for some front and some rear
"Bose Symphony II with AMP" ->10 speakers, ext. amp for rear and sub
"Bose Symphony II with BOSE" ->8 speakers, ext. amp for all
"RNS-E
Radio/Navigation with AMP" ->10 speakers, ext. amp for rear and sub
"RNS-E Radio/Navigation with BOSE" ->15 speakers, ext. amp for some front and all rear and sub
*Note: there are different audio systems and diagrams for A4 convertible models.
I can post diagrams for any of these systems if needed. It sounds like you either have the "Bose Symphony II with AMP" or the "Bose Symphony II with BOSE". Depending on which system you have, you could have all of the speakers
power through an external
amplifier or have only the rears powered by the external amp. Here are the diagrams for those 2 systems:
2005AudiA4BoseSymphony2withAMPpage1.pdf
2005AudiA4BoseSymphony2withAMPpage2.pdf
2005AudiA4BoseSymphony2withBOSEpage1.pdf
2005AudiA4BoseSymphony2withBOSEpage2.pdf
Please let me know if you would like to see any of the other diagrams. I hope these help.
Peace.
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