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<blockquote data-quote="IDSkoT" data-source="post: 4173949" data-attributes="member: 584344">It seems a few people are having this same problem as me now.I went to set the gains on my amp with a newly acquired Radioshack DMM, and my Moms asked me to move my car so she could get out. Prior to this, I had turned my car on and off maybe 3 times in the course of an hour. Trying to set my gains and I didn&#039;t want the battery to die, but I couldn&#039;t figure it out (and stil lcan&#039;t).So, the last time I turned it off I heard a pop but didn&#039;t think much of it. When my mom asked me to move, the pop happened when the car turned on, and I heard alt noise (whirring sound that increases in pitch / volume when the engine&#039;s reved).I&#039;m guess it&#039;s a bad ground... maybe off the speaker amp? [i have a JBL 750.II or something like that... it&#039;s a 104x4 @ 4-ohm amp and a Boss 1200M which is 600x1 @ 2-ohm]I also have a Pioneer DEH-P6900UB for my HU. Should I ground that and see if it helps? I kind of want to avoid pulling the HU out since I lost the clips for them and I don&#039;t want to scratch or break anything with clothes hangers if I don&#039;t have to.Help?EDIT:: and if it is a messed up ground-- why&#039;d it just now start messing up? I&#039;ve had that set-up like that for a couple of months now with the gains set at an audible level, rather than with a machine (DMM or oscilliscope).</blockquote>

[QUOTE="IDSkoT, post: 4173949, member: 584344"] It seems a few people are having this same problem as me now. I went to set the gains on my amp with a newly acquired Radioshack DMM, and my Moms asked me to move my car so she could get out. Prior to this, I had turned my car on and off maybe 3 times in the course of an hour. Trying to set my gains and I didn't want the battery to die, but I couldn't figure it out (and stil lcan't). So, the last time I turned it off I heard a pop but didn't think much of it. When my mom asked me to move, the pop happened when the car turned on, and I heard alt noise (whirring sound that increases in pitch / volume when the engine's reved). I'm guess it's a bad ground... maybe off the speaker amp? [i have a JBL 750.II or something like that... it's a 104x4 @ 4-ohm amp and a Boss 1200M which is 600x1 @ 2-ohm] I also have a Pioneer DEH-P6900UB for my HU. Should I ground that and see if it helps? I kind of want to avoid pulling the HU out since I lost the clips for them and I don't want to scratch or break anything with clothes hangers if I don't have to. Help? EDIT:: and if it is a messed up ground-- why'd it just now start messing up? I've had that set-up like that for a couple of months now with the gains set at an audible level, rather than with a machine (DMM or oscilliscope). [/QUOTE]

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