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I have a new elf E2125x amp, it is essentially the same as the arc 125.2 mini amp.

here is my problem, i have looked at both amps instruction manuals and NEITHER mention the speaker level input connector (or that the amp even supports it).

The speaker level input connector supplied by elf is like most amps, a connector that plugs into the amp and out of that connector are x wires. connect your speaker wire to the appropriate wire from that connector, etc.

however, unlike other amps i have used there is an additional ground wire coming out of that speaker level input connector. this is not the ground for the amp, that is on the other side of the amp located next to the +12v power connector (and next to the remote turn on when using line level inputs). just to help you visualize things, for a 2 channel amp, the speaker level input connector will usually have 4 wires (right +, right -, left +, left -). On this elf connector there are 5 wires (the 5th being for ground).

So the question is, what is this "speaker level input ground" for? In searching the internet, some folks connect it to a bolt on the head unit via a wire, some people connect it to a bolt on the amp itself and some people connect it to the same place the amp ground goes to.

what say you?
 

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If you are certain its a ground wire, ground it and see what happens. Doesn't seem to make sense to me that you need to ground an input though...
 

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It may not even be needed depending on your setup. I'd try it without first and if you have noise, ground it.
 

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My recently installed Boss amp had the same set up: ground wires along with the regular +,- speakers wires. I ignored them. Works well without.

(I disagree that they are any kind of voltage wire since they are only associated with the speakers.)
 
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