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Message: <blockquote data-quote="spokey9" data-source="post: 8877526" data-attributes="member: 685744">The enclosure affects resonate frequency and that in turns effects  impedence across frequencies.it's part of the reason when you take a true 4 ohm sub (for example) place it in a box and play music the impedence would rarely show 4 ohm. Even with a tone the same sub in the same box would show the 4ohm until the coils started to heat up then you'd see rise there as well.It's a big reason why you can sometimes cheat an amp by wiring lower than it's rated because the box is part of the driver and affects the impedence the amp will see</blockquote>

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