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<blockquote data-quote="audioholic" data-source="post: 551164" data-attributes="member: 549629">SPL is Sound Pressure Level. So in effect, its a measurement of how much your speakers are pressurizing the air molecules inside your car.Power is only one part of the overall output equation. For example, driver efficiency and driver/enclosure efficiency affect the power input part of the equation. There is also a phenomenon called power compression that basically means as you increase power input to the driver, efficiency drops slightly (it will not use a second 500 watts as efficiently as it did the first 500 watts) due to power loss in the form of heat.Yes, a 40hz note played for exactly 3 seconds would yield 120 cone cycles.As for which would be louder, the two 10&#039;s or the one 15, cone area is relatively close, and if we are talking about the same model subs, xmax should remain the same. In this case two 10&#039;s will have the advantage of allowing more power input than the 15 due to two motors to allow for heat dissipation. Power compression will be less on the two 10&#039;s. I dont know.. the 15 would probably still be louder, but not definitely.</blockquote>

[QUOTE="audioholic, post: 551164, member: 549629"] SPL is Sound Pressure Level. So in effect, its a measurement of how much your speakers are pressurizing the air molecules inside your car. Power is only one part of the overall output equation. For example, driver efficiency and driver/enclosure efficiency affect the power input part of the equation. There is also a phenomenon called power compression that basically means as you increase power input to the driver, efficiency drops slightly (it will not use a second 500 watts as efficiently as it did the first 500 watts) due to power loss in the form of heat. Yes, a 40hz note played for exactly 3 seconds would yield 120 cone cycles. As for which would be louder, the two 10's or the one 15, cone area is relatively close, and if we are talking about the same model subs, xmax should remain the same. In this case two 10's will have the advantage of allowing more power input than the 15 due to two motors to allow for heat dissipation. Power compression will be less on the two 10's. I dont know.. the 15 would probably still be louder, but not definitely. [/QUOTE]

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