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RCA Jack for speakers, which is positive which is negative??

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Timoe:
On an RCA style plug for speakers, which is the + and which is the - (positive or negative) ?

see attached pic.

Thank you.

Zakk:
Outside is negative.  At least on every one I've ever wired up :)

markrvp:
Yep, what Zakk said.  The center pin is positive, the outer ring is negative (or ground).

Izrun:
I third this!  FYI, this is pretty much the case in most cables (for instance, in coax the outer screwed part is ground, and the same with svideo, usb, etc)

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