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<blockquote data-quote="n2audio" data-source="post: 5115116" data-attributes="member: 540940">First of all - in an attempt to TRY to get to the basics of the OP...Conductive materials of ANY kind have &quot;X&quot; resistance per unit of length.&nbsp; Resistance in power wires is the enemy which I think we can all agree on.Copper wire resistance of a given gauge is essentially constant.Steel/aluminum/tin/lead/cast iron/weld etc of a car&#039;s chassis varies widely depending on the car...BUT - the few tests that have been done indicate the AVERAGE resistance of a car&#039;s chassis between typical (-) return paths is somewhere in the range 4-1/0 awg copper wire.SO -- If your amps require more current than 4 awg wire can supply it might be worth considering a large (-) wire directly to the battery.&nbsp; Larger than 1/0 and it&#039;s probably worth doing.That&#039;s really all there is to it.None at all.I wonder though if the EMI would at least partially cancel since you&#039;d have current flowing in equal/opposite directions??you don&#039;t have to seperate those either.&nbsp; Any EMI from the low voltage low freq variances in the power wire are not going to have an audible effect on the signal.&nbsp; Old myth - it just doesn&#039;t happen.Precisely -- more specifically, hydrogen.&nbsp; Heard of the Hindenburg?</blockquote>

[QUOTE="n2audio, post: 5115116, member: 540940"] First of all - in an attempt to TRY to get to the basics of the OP... Conductive materials of ANY kind have "X" resistance per unit of length. Resistance in power wires is the enemy which I think we can all agree on. Copper wire resistance of a given gauge is essentially constant. Steel/aluminum/tin/lead/cast iron/weld etc of a car's chassis varies widely depending on the car... BUT - the few tests that have been done indicate the AVERAGE resistance of a car's chassis between typical (-) return paths is somewhere in the range 4-1/0 awg copper wire. SO -- If your amps require more current than 4 awg wire can supply it might be worth considering a large (-) wire directly to the battery. Larger than 1/0 and it's probably worth doing. That's really all there is to it. None at all. I wonder though if the EMI would at least partially cancel since you'd have current flowing in equal/opposite directions?? you don't have to seperate those either. Any EMI from the low voltage low freq variances in the power wire are not going to have an audible effect on the signal. Old myth - it just doesn't happen. Precisely -- more specifically, hydrogen. Heard of the Hindenburg? [/QUOTE]

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