This subwoofer is brand new but I'm pretty sure someone probably bought it years ago and placed it somewhere and forgot all about it because the box is ancient and I can't find any info about this sub woofer online. I found 15w3-4 , 15w2-4 but not 15w0-4
https://images.craigslist.org/00f0f_6z78TbpcGLE_60...
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Answers & Comments
Contact JL Audio customer support and they will be able to tell you the specs. At least that's what a logical person would do.
EDIT: Or learn how to do better internet searches: http://www.cnet.com/products/jl-audio-15w0-4-subwo...
You need a voltmeter and a tone generator and a standard 1 cubic foot box and an oscilloscope