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<blockquote data-quote="helotaxi" data-source="post: 4943631" data-attributes="member: 550915">1)Power compression comes from a few different places.&nbsp; The two big ones are voicecoil heating and the fact that you run out of motor strength as the cone moves farther from the center position of the cone&#039;s travel.&nbsp; Because of the first, the resistance and thus impedance of the coil increases and the actual power sent to the sub is decreased because the amp is seeing a higher impedance.&nbsp; The second means that even more power is needed to get the sub to travel any farther.&nbsp; Eventually you get to a point where the motor can no longer overcome the compliance of the suspension and it won&#039;t move any farther regardless of how much power you pump into it.2)Multiply 1 by 2 8 times.&nbsp; You get 256.&nbsp; Remember that you theoretically get 3dB every time that you double power.&nbsp; You doubled power 8 times getting from 1 watt which is the sensitivity standard and 256 watts.&nbsp; 3 times 8 is 24 which gives you a theoretical 24dB increase from the reference level.&nbsp; At that low power level, you&#039;d probably actually get all that increase because of minimal power compression.&nbsp; To get the next 24dB you&#039;d have to double power 8 more times.&nbsp; I started with 300w and multiplied by 2 8 times and got a bit over 76,000.&nbsp; You wouldn&#039;t get hardly any of that increase becuase even if you didn&#039;t smoke the sub, power compression would severely limit your actual gains.I&#039;m up in the northwest corner of Vegas near the intersection of 215 and 95.</blockquote>

[QUOTE="helotaxi, post: 4943631, member: 550915"] 1)Power compression comes from a few different places. The two big ones are voicecoil heating and the fact that you run out of motor strength as the cone moves farther from the center position of the cone's travel. Because of the first, the resistance and thus impedance of the coil increases and the actual power sent to the sub is decreased because the amp is seeing a higher impedance. The second means that even more power is needed to get the sub to travel any farther. Eventually you get to a point where the motor can no longer overcome the compliance of the suspension and it won't move any farther regardless of how much power you pump into it. 2)Multiply 1 by 2 8 times. You get 256. Remember that you theoretically get 3dB every time that you double power. You doubled power 8 times getting from 1 watt which is the sensitivity standard and 256 watts. 3 times 8 is 24 which gives you a theoretical 24dB increase from the reference level. At that low power level, you'd probably actually get all that increase because of minimal power compression. To get the next 24dB you'd have to double power 8 more times. I started with 300w and multiplied by 2 8 times and got a bit over 76,000. You wouldn't get hardly any of that increase becuase even if you didn't smoke the sub, power compression would severely limit your actual gains. I'm up in the northwest corner of Vegas near the intersection of 215 and 95. [/QUOTE]

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