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<blockquote data-quote="DIGIDIGIBOMBO" data-source="post: 1288595" data-attributes="member: 562297">Since the supply voltage is 12V DC, when using a test tone cd etc...on the DMM i can cranck the gain and get like 30-40V AC and the DMM converts them into rms accurately if its a pure sine wave, so 30V AC rms is similar to 30 V DC ( they will give same power...) =&amp;gt; i am having an output voltage higher than the supply voltage, how is that???? i know from physics, that energy in= energy out, so how is this? from where this excess power? thx<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown&nbsp; &nbsp; :(" loading="lazy" data-shortname=":(" />is it like adding in series the battery voltage supply+ preout voltage of head unit or what, dammmm i can understand<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown&nbsp; &nbsp; :(" loading="lazy" data-shortname=":(" /></blockquote>

[QUOTE="DIGIDIGIBOMBO, post: 1288595, member: 562297"] Since the supply voltage is 12V DC, when using a test tone cd etc...on the DMM i can cranck the gain and get like 30-40V AC and the DMM converts them into rms accurately if its a pure sine wave, so 30V AC rms is similar to 30 V DC ( they will give same power...) => i am having an output voltage higher than the supply voltage, how is that???? i know from physics, that energy in= energy out, so how is this? from where this excess power? thx:( is it like adding in series the battery voltage supply+ preout voltage of head unit or what, dammmm i can understand:( [/QUOTE]

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