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Message: <blockquote data-quote="cacin" data-source="post: 1156842" data-attributes="member: 10222">Ok, this comes from the car stereo cookbook second edition."How Much Power Do you need?The appropriate power for a subwoofer amp mainly depends on how much power is used for the rest of the system and the subwoofer crossover frequency used. The typical frequency distribution of power in music is shown in the table.Notice that less than half the power in music is above 300Hz. This means that at least half the power in music is below 300Hz. To make sure you're covered, use the following rule of thumb: the sub amp power should equal 1.5 times the power to the front speakers. This rule is quite generous with power to the sub for typical situations, but not all situations are typical. Consider using more power for your sub amp if1. your sub X-Over frequency is higher than 150Hz2. your sub sensitivity is exceptionally low.3. your sub is installed in a trunk that is sonically isolated from the passenger compartment.4. you like music with lots of deep bass. "pheww.....</blockquote>

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