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<blockquote data-quote="metalheadjoe" data-source="post: 8877510" data-attributes="member: 581422">I&#039;m aware of the common misconception parroted by people without any proof or understanding. I have yet to see any evidence that such a phenomenon exists. It would be easy to prove: put a subwoofer in a box and measure power at a given frequency. Put the subwoofer in a different box and measure power at the same frequency.Subs handle over rated for burps because they are burps. &quot;Isn&#039;t this common knowledge for the old heads on here???&quot; I understand you&#039;re trying to rally support because you can&#039;t offer any logic, theory, or evidence.You assumed correctly. The difference in output is because a sealed box becomes a vacuum as the sub extends and becomes pressurized as the sub retracts. The box pressure wants to hold the sub in place.How does higher power create higher inductance?Impedance is a function of frequency. That&#039;s why your 1 ohm sub could present a 5 ohm load at port frequency or at any other frequency depending on the coil. Frequency changes impedance, not the box.I&#039;ll give you the benefit of the doubt and assume you meant &quot;blast a 2kw sub from a 10kw amp&quot;, because as stated you contradict yourself in the same sentence. That 10k amp is meant to put out 10k at a certain impedance. I agree that the amp will not make 10k at all impedances. Again, the amp&#039;s output depends on frequency, not the box.Common knowledge can be wrong.</blockquote>

[QUOTE="metalheadjoe, post: 8877510, member: 581422"] I'm aware of the common misconception parroted by people without any proof or understanding. I have yet to see any evidence that such a phenomenon exists. It would be easy to prove: put a subwoofer in a box and measure power at a given frequency. Put the subwoofer in a different box and measure power at the same frequency. Subs handle over rated for burps because they are burps. "Isn't this common knowledge for the old heads on here???" I understand you're trying to rally support because you can't offer any logic, theory, or evidence. You assumed correctly. The difference in output is because a sealed box becomes a vacuum as the sub extends and becomes pressurized as the sub retracts. The box pressure wants to hold the sub in place. How does higher power create higher inductance? Impedance is a function of frequency. That's why your 1 ohm sub could present a 5 ohm load at port frequency or at any other frequency depending on the coil. Frequency changes impedance, not the box. I'll give you the benefit of the doubt and assume you meant "blast a 2kw sub from a 10kw amp", because as stated you contradict yourself in the same sentence. That 10k amp is meant to put out 10k at a certain impedance. I agree that the amp will not make 10k at all impedances. Again, the amp's output depends on frequency, not the box. Common knowledge can be wrong. [/QUOTE]

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