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Message: <blockquote data-quote="trex92" data-source="post: 959937" data-attributes="member: 4353">dude, as long as u connect ur amp to the battery, the connection would be alternator>battery>amp and hence ur amp is indeed wired to the battery. If what u said is true on battery and thicker wires, meaning that even if i just use a standalone battery to power my ICE i would still get aeroplane sound...? :D :D Aeroplane sound aka alternator whine is from the alternator though could be caused by various factors (as in the next paragraph).besides, i have done my homework also la, coz last time i had aeroplane sound and checked a number of forums and always they say the same thing ie check grounding for amp (might have ground loop), check power cables, and check RCA cables (maybe inferior quality). So far i never came across solution as use bigger batteries can overcome aeroplane sound....As for the grounding kit one, it came from personal experience as i explained earlier, putting a grounding kit i overcame my aeroplane sound.As for the spark plug cables, there is such a thing as EMI (Electro Magnetic Interence) which thick and poorly insulated spark plug cables produces. Again this came from my personal experience as explained earlier. This should not be mixed up with aeroplane sound. This could be the cause for our fren here as he described something tht sounds like EMI rather than aeroplane.Yes, i agree that forum is good place to exchange ideas :) but if u know somebody else is wrong, don't u say it out so all parties can learn rite :)ohhh.. one more thing, yes ur case is the pre-amp but did u check whether the grounding for the preamp is using thick wires or thin ones? Bad grounding for pre-amp would give same effect as bad grounding for amp and cause aeroplane sound.</blockquote>