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<blockquote data-quote="TaylorFade" data-source="post: 8134448" data-attributes="member: 618111">When clamping a reactive load (like a subwoofer), the voltage and amperage are out of phase. Instead of one single wave, it&#039;s two seperate ones. The degree of their seperation determines the inaccuracy of the clamp.Say you clamp 1,000w. But the voltage and amperage are 30* out of phase. Cosine of 30* is .87. That means that our clamp is 13% higher than &quot;real&quot; power. The 1,000w is what&#039;s known as &quot;apparent power&quot;. To figure real power you have to account for this phase angle. With fixed resistance, you don&#039;t because the voltage and amperage will be in phase. This is why the numbers from the AD-1 amp dyno will usually be lower than a traditional clamp. Because it uses fixed resistance. It&#039;s also why some amps will do way more than their ratings.Clamping isn&#039;t perfect. But it&#039;s all we have.Did none of you see my T-Fade-o -phones video? Lol.<a href="http://www.youtube.com/watch?v=WmBxQv90JIE" target="_blank">Headphones that can hear distortion. - YouTube</a>[Edit: before anyone says anything about the DD-1 in this video, I spoke with D&#039;Amore engineering and apparently i have a busted DD-1. It&#039;s apparently a common issue with the earlier runs. Something about a two step voltage doomahickey or some shit.]</blockquote>

[QUOTE="TaylorFade, post: 8134448, member: 618111"] When clamping a reactive load (like a subwoofer), the voltage and amperage are out of phase. Instead of one single wave, it's two seperate ones. The degree of their seperation determines the inaccuracy of the clamp. Say you clamp 1,000w. But the voltage and amperage are 30* out of phase. Cosine of 30* is .87. That means that our clamp is 13% higher than "real" power. The 1,000w is what's known as "apparent power". To figure real power you have to account for this phase angle. With fixed resistance, you don't because the voltage and amperage will be in phase. This is why the numbers from the AD-1 amp dyno will usually be lower than a traditional clamp. Because it uses fixed resistance. It's also why some amps will do way more than their ratings. Clamping isn't perfect. But it's all we have. Did none of you see my T-Fade-o -phones video? Lol. [URL="http://www.youtube.com/watch?v=WmBxQv90JIE"]Headphones that can hear distortion. - YouTube[/URL] [Edit: before anyone says anything about the DD-1 in this video, I spoke with D'Amore engineering and apparently i have a busted DD-1. It's apparently a common issue with the earlier runs. Something about a two step voltage doomahickey or some sh[COLOR=black]i[/COLOR]t.] [/QUOTE]

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