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<blockquote data-quote="yarn" data-source="post: 6785303" data-attributes="member: 621588">Setup:<ul>
<li data-xf-list-type="ul">Pyramid amp, 
</li>
<li data-xf-list-type="ul">2 Alpine subs 
</li>
<li data-xf-list-type="ul">Cheapest alpine deck I could find. 
</li>
</ul>After driving for a few minutes, the thump starts to happen. Also when it happens, I can hear a high pitch spinning when I rev tthe engine. They both happen simultaneously. But at very random times. It&#039;ll thump for 10 - 60 seconds, then stop for a few minutes.I&#039;ve never experiened this until I moved the ground for the amp. I moved it back to the original spot (when there were no problems.) but the thumping/engine humming persisted, so I sanded down the metal grounding the amp. (That didn&#039;t really solve much, it alleviated the problem though. Which doesn&#039;t make sense to me, because it was fine when I first installed it. It worked fine up until I decided to play with the ground)The thumping/engine humming stops when I shut off the HU.If it&#039;s worth mentioning, when I moved the amp ground, it apparently wasn&#039;t good enough (and caused the amp to heat up pretty quick. I started hearing thumping noises 5 minutes into driving, as soon as I heard it, I pulled over and swapped the ground to where it original was. Also... when I was messing with the wires, I had one sub in (+)(-) and the other in (-)(+) which canceled each other out. I didn&#039;t realize this until 20 minutes into driving.Did I mess up bad? Do I need to ground the head unit? Do I need a new amp?</blockquote>

[QUOTE="yarn, post: 6785303, member: 621588"] Setup: [LIST] [*]Pyramid amp, [*]2 Alpine subs [*]Cheapest alpine deck I could find. [/LIST] After driving for a few minutes, the thump starts to happen. Also when it happens, I can hear a high pitch spinning when I rev tthe engine. They both happen simultaneously. But at very random times. It'll thump for 10 - 60 seconds, then stop for a few minutes. I've never experiened this until I moved the ground for the amp. I moved it back to the original spot (when there were no problems.) but the thumping/engine humming persisted, so I sanded down the metal grounding the amp. (That didn't really solve much, it alleviated the problem though. Which doesn't make sense to me, because it was fine when I first installed it. It worked fine up until I decided to play with the ground) The thumping/engine humming stops when I shut off the HU. If it's worth mentioning, when I moved the amp ground, it apparently wasn't good enough (and caused the amp to heat up pretty quick. I started hearing thumping noises 5 minutes into driving, as soon as I heard it, I pulled over and swapped the ground to where it original was. Also... when I was messing with the wires, I had one sub in (+)(-) and the other in (-)(+) which canceled each other out. I didn't realize this until 20 minutes into driving. Did I mess up bad? Do I need to ground the head unit? Do I need a new amp? [/QUOTE]

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