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Car Audio Discussion
General Car Audio
wattage vs sub senstivity
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<blockquote data-quote="zako" data-source="post: 7949916" data-attributes="member: 629735"><p>Subwoofer and speaker sensitivities are often totally oversold. One thing you should be aware of is that you can rate the subwoofer using 1watt/1meter SPL standard or 2.8V/1meter. These are not the same.</p><p></p><p>2.8V corresponds to 2watts if the subwoofer has nominal 4ohm impedance, and 4watts if the subwoofer has 2ohm impedance. So, if the manufacturer gives you SPL for a 4ohm DVC subwoofer are measured at 2.8V/1meter method, then you should realize that the rating is done at 4watts. This rating should be roughly 6dBs higher than the rating done with 1watt/meter measurement.</p><p></p><p>Now, let's say that you are compared apples to apple. Two subwoofers with equal final impedance, and you have 1watt/1meter SPL rating. Let's say the first one is 82dB and the second is 85dB. Does this mean that you need to run twice as much power to the first subwoofer to make it play as loud as the second? Maybe.. perhaps..likely. But that's not the whole story because 1watt/1meter is a small signal rating. It's said that in theory power should be doubled to increase the SPL by 3dB, but the speaker may not respond linearly to doubling power at high wattage levels.</p><p></p><p>By the way, so how do you obtain 1watt/1meter SPL sensitivity if the manufacturer does not give it to do? Enter T/S parameters into subwoofer parameters dialog in WinISD alpha. It will calculate the SPL sensitivity for you. It's pretty good, it's usually within something like 1/10ths of the number supplied by the manufacturer (when they do).</p></blockquote><p></p>
[QUOTE="zako, post: 7949916, member: 629735"] Subwoofer and speaker sensitivities are often totally oversold. One thing you should be aware of is that you can rate the subwoofer using 1watt/1meter SPL standard or 2.8V/1meter. These are not the same. 2.8V corresponds to 2watts if the subwoofer has nominal 4ohm impedance, and 4watts if the subwoofer has 2ohm impedance. So, if the manufacturer gives you SPL for a 4ohm DVC subwoofer are measured at 2.8V/1meter method, then you should realize that the rating is done at 4watts. This rating should be roughly 6dBs higher than the rating done with 1watt/meter measurement. Now, let's say that you are compared apples to apple. Two subwoofers with equal final impedance, and you have 1watt/1meter SPL rating. Let's say the first one is 82dB and the second is 85dB. Does this mean that you need to run twice as much power to the first subwoofer to make it play as loud as the second? Maybe.. perhaps..likely. But that's not the whole story because 1watt/1meter is a small signal rating. It's said that in theory power should be doubled to increase the SPL by 3dB, but the speaker may not respond linearly to doubling power at high wattage levels. By the way, so how do you obtain 1watt/1meter SPL sensitivity if the manufacturer does not give it to do? Enter T/S parameters into subwoofer parameters dialog in WinISD alpha. It will calculate the SPL sensitivity for you. It's pretty good, it's usually within something like 1/10ths of the number supplied by the manufacturer (when they do). [/QUOTE]
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