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Car Audio Discussion
General Car Audio
Amplifier output power vs. electrical system input voltage
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<blockquote data-quote="Julian" data-source="post: 7778442" data-attributes="member: 625353"><p>With the huge amplifiers that are out now a days can draw huge amounts of current without batting an eye. So most reputable companies will rate at 12-12.4 or so volts because dropping below that 13.8v is extremely easy. The good thing about rating at 12v is that if you can stand to stay above that the amplifier will have higher output.</p><p></p><p>you can do some simple math to figure this out, however it's not 100% perfect because I am not account for efficiency</p><p></p><p>lets say you have a 1500w amplifier</p><p></p><p>Watts/volts = amperage</p><p></p><p>so</p><p></p><p>1500/12.4= 121 amps rounded up</p><p></p><p>so we take the same amount of amperage times a higher voltage, say 13.5v and we get</p><p></p><p>13.5v*121= 1633 watts</p><p></p><p>1633-1500= 133 more watts..</p><p></p><p>you see with the lower spec rated at 12v we get slightly more power.. and this can help a lot in the competition lanes. The gain can be much more but that's dependent on the amplifier.</p><p></p><p>and we can use some more math to find out how much of a change that would be...</p><p></p><p>L =10log (P/Pref)</p><p></p><p>P=new power</p><p></p><p>Pref= original power</p><p></p><p>L =10log (1633/1500)</p><p></p><p>10 log(1633 / 1500) = 0.368949257 dB change.. It's completely inaudible but could be the difference between a win and a lose.</p><p></p><p>The difference in bigger amplifiers you will see a manageable difference... but overall in a daily situation it doesn't mean much.</p><p></p><p>Oh and that's not account for power compression.. blah blah blah.</p></blockquote><p></p>
[QUOTE="Julian, post: 7778442, member: 625353"] With the huge amplifiers that are out now a days can draw huge amounts of current without batting an eye. So most reputable companies will rate at 12-12.4 or so volts because dropping below that 13.8v is extremely easy. The good thing about rating at 12v is that if you can stand to stay above that the amplifier will have higher output. you can do some simple math to figure this out, however it's not 100% perfect because I am not account for efficiency lets say you have a 1500w amplifier Watts/volts = amperage so 1500/12.4= 121 amps rounded up so we take the same amount of amperage times a higher voltage, say 13.5v and we get 13.5v*121= 1633 watts 1633-1500= 133 more watts.. you see with the lower spec rated at 12v we get slightly more power.. and this can help a lot in the competition lanes. The gain can be much more but that's dependent on the amplifier. and we can use some more math to find out how much of a change that would be... L =10log (P/Pref) P=new power Pref= original power L =10log (1633/1500) 10 log(1633 / 1500) = 0.368949257 dB change.. It's completely inaudible but could be the difference between a win and a lose. The difference in bigger amplifiers you will see a manageable difference... but overall in a daily situation it doesn't mean much. Oh and that's not account for power compression.. blah blah blah. [/QUOTE]
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