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Car Audio Equipment
Subwoofers
Trying to decide which subwoofer to get
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<blockquote data-quote="hispls" data-source="post: 8451537" data-attributes="member: 614752"><p>If you haven't done an impedance sweep on the sub in question in the box installed in the vehicle you have no idea what impedance the amp sees at any frequency. Furthermore you have no idea what OP is going to do with this sub.</p><p></p><p></p><p>3" 8 layer should also be acceptable.</p><p></p><p></p><p>Care to explain the difference between "clean" power and the other sort that allows a rather thin 3" 4 layer coil to manage potentially 3000W worth of heat?</p><p></p><p></p><p>They may well be giving it close to 13KW. Without having done an impedance graph or clamp you have no idea nor do I. Is this 13KW worth of amp test a 3 second tone or is it him playing Young Jeezy slowed and bass boosted?</p><p></p><p>You kids seem to think that there's some magical "box rise" that adds 1 or 2 ohms or some other arbitrary number to the nominal impedance of a sub. This is not how a loudspeaker works and the term impedance implies AC signal where the value in ohms is a function of many factors in the "circuit", cannot be measured or calculated without frequency, and will be different at every frequency.</p><p></p><p><img src="http://www.northreadingeng.com/Ql_5_circuit.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>^^^ model of a loudspeaker in a vented box.</p><p></p><p>But you guys just KNOW what impedance a sub you've never tested will show at any given frequency in a box that you've never tested in a car you don't own.</p></blockquote><p></p>
[QUOTE="hispls, post: 8451537, member: 614752"] If you haven't done an impedance sweep on the sub in question in the box installed in the vehicle you have no idea what impedance the amp sees at any frequency. Furthermore you have no idea what OP is going to do with this sub. 3" 8 layer should also be acceptable. Care to explain the difference between "clean" power and the other sort that allows a rather thin 3" 4 layer coil to manage potentially 3000W worth of heat? They may well be giving it close to 13KW. Without having done an impedance graph or clamp you have no idea nor do I. Is this 13KW worth of amp test a 3 second tone or is it him playing Young Jeezy slowed and bass boosted? You kids seem to think that there's some magical "box rise" that adds 1 or 2 ohms or some other arbitrary number to the nominal impedance of a sub. This is not how a loudspeaker works and the term impedance implies AC signal where the value in ohms is a function of many factors in the "circuit", cannot be measured or calculated without frequency, and will be different at every frequency. [IMG]http://www.northreadingeng.com/Ql_5_circuit.png[/IMG] ^^^ model of a loudspeaker in a vented box. But you guys just KNOW what impedance a sub you've never tested will show at any given frequency in a box that you've never tested in a car you don't own. [/QUOTE]
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Trying to decide which subwoofer to get
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