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<blockquote data-quote="Buck" data-source="post: 8755262" data-attributes="member: 591582">I bet that&#039;s alternator pulsations going in through the DC power wires, the amp&#039;s power wires.&nbsp; In my opinion, what you&#039;re seeing is the alternator pulsations, because the alt pulses it&#039;s charging voltage, it&#039;s not really DC like a battery shows or delivers DC power.&nbsp; It&#039;s AC being turned into DC, so the DC still pulsates voltage like any AC generator would.Many alts are 3 phase, like a 3 phase electric motor:[ATTACH=full]30880[/ATTACH]I bet you some money that your amp and it&#039;s lack of what seems to be capacitors (low dampening factor) is allowing the alternator pulsation to make it into the speaker wires, because the amp lacks the components to absorb these pulsations and smooth them out.I think possibly a bank of very fast discharge capacitors or some type of lithium, that can hold a charge higher than your alt charges, would capture these pulsations and smooth them out, where your amplifier is feeding from less pulsating 12v current, aka a more consistent voltage feed into the amp.I think this is what you&#039;re seeing in your wave there:[ATTACH=full]30881[/ATTACH]This is why I don&#039;t like those types of amps.&nbsp; It&#039;s the nature of lower quality amps, IMO.&nbsp; Amps with higher dampening factors and more internal components, all of those things are there for reasons, and it&#039;s largely about clean electricity and regulation of voltage spikes within parts of the system, whether it&#039;s the subwoofer and impedence changes, or if it&#039;s something like the alternator pulsations showing up in your actual subwoofer signal.</blockquote>

[QUOTE="Buck, post: 8755262, member: 591582"] I bet that's alternator pulsations going in through the DC power wires, the amp's power wires. In my opinion, what you're seeing is the alternator pulsations, because the alt pulses it's charging voltage, it's not really DC like a battery shows or delivers DC power. It's AC being turned into DC, so the DC still pulsates voltage like any AC generator would. Many alts are 3 phase, like a 3 phase electric motor: [ATTACH type="full" alt="30880"]30880[/ATTACH] I bet you some money that your amp and it's lack of what seems to be capacitors (low dampening factor) is allowing the alternator pulsation to make it into the speaker wires, because the amp lacks the components to absorb these pulsations and smooth them out. I think possibly a bank of very fast discharge capacitors or some type of lithium, that can hold a charge higher than your alt charges, would capture these pulsations and smooth them out, where your amplifier is feeding from less pulsating 12v current, aka a more consistent voltage feed into the amp. I think this is what you're seeing in your wave there: [ATTACH type="full" alt="30881"]30881[/ATTACH] This is why I don't like those types of amps. It's the nature of lower quality amps, IMO. Amps with higher dampening factors and more internal components, all of those things are there for reasons, and it's largely about clean electricity and regulation of voltage spikes within parts of the system, whether it's the subwoofer and impedence changes, or if it's something like the alternator pulsations showing up in your actual subwoofer signal. [/QUOTE]

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