Polk PA660 - Speaker Level Input Harness Question

[atari400]

Hi there, I have installed a PA660 in my 2012 Kia Rio along with Polk DXI650 front / DXI650S rear.

The question I have is that the speaker level input harness has a pair of wires for every speaker input but there is an additional black wire that is not described in the product manual.

I left it disconnected and the audio sounds great, but should it be tied to something ?

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[infamous_e46 5,000+ posts]

Ground lol