http://forum.lowyat.net/ Thu, 08 Oct 2026 15:15:12 +0800 FeedCreator 1.7.2 http://forum.lowyat.net/topic/927071 Recently i am having this humming / hissing &#39;electric sound&#39; coming out from my tweeters / speakers..Even without starting the engine or even the radio/player ,i can hear this humming sound quite loud..Is it cause by grounding problem?...I tried changing amp..but still the humming sound is there..its not happening consistently but most noticeable during early in the morning when im about to start the engine..My setup is default HU &gt;&gt; preamp &gt;&gt; 4 channel amp. to power up front component and subwoofer..I m using hi to low..i thought it might be the preamp causing the problem so i tried to isolate the pre amp by connecting HU directly to the amp but still the hissing sound is still there..<br /><br />Any suggestion what i should do ? DrowningPool ICE Fri, 06 Feb 2009 04:33:00 +0800