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<blockquote data-quote="PaulD" data-source="post: 6264615" data-attributes="member: 589636">It is being charged by a device (alternator) that puts out rectified AC that is still fairly noisy, so the battery &quot;sees&quot; DC coming from the alt riding on a smoothed out AC wave (ripple).The other problem most people do not mention is that the amp&#039;s power supply does not draw &quot;DC&quot; from the amp.&nbsp; The Dc to DC PWM power supply draws power at like 60 KHz and and puts it thru a torroid so it can raise the voltage quite a bit.&nbsp; It turns out that under this system, the inductance of the power wire is more important than the resistance to a certain degree - obviously you can&#039;t run an amp fused for 100 amps with an 18 Ga wire.&nbsp; A senior engineering guy from Blaupunkt wrote an article about this some time ago.The real use for a cap in a system is for filtering.&nbsp; It can also supply peak power for transients in an SQ system.&nbsp; They are useless for SPL systems playing sine wave tones with virtually no dynamics because the power will be depleted too quickly.&nbsp; They are just a marketing scheme for companies and retailers to make money on.</blockquote>

[QUOTE="PaulD, post: 6264615, member: 589636"] It is being charged by a device (alternator) that puts out rectified AC that is still fairly noisy, so the battery "sees" DC coming from the alt riding on a smoothed out AC wave (ripple). The other problem most people do not mention is that the amp's power supply does not draw "DC" from the amp. The Dc to DC PWM power supply draws power at like 60 KHz and and puts it thru a torroid so it can raise the voltage quite a bit. It turns out that under this system, the inductance of the power wire is more important than the resistance to a certain degree - obviously you can't run an amp fused for 100 amps with an 18 Ga wire. A senior engineering guy from Blaupunkt wrote an article about this some time ago. The real use for a cap in a system is for filtering. It can also supply peak power for transients in an SQ system. They are useless for SPL systems playing sine wave tones with virtually no dynamics because the power will be depleted too quickly. They are just a marketing scheme for companies and retailers to make money on. [/QUOTE]

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