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1200W Subwoofer, Pro Audio B-52 - $499 or trade for bike - $499 (Goleta)
This is a used B-52 ACT-18X Active 18" 1200W Subwoofer. It is in perfect operating condition, sounds great, but I am moving soon. It is EXTREMELY easy to use, and I have all the adapters you need for RCA inputs (which I'll include for a little extra). You really don't need to have any other equipment for it, as it has a built-in crossover, limiter, and gain. Just plug it into any output of your system and it will do the rest!
It has a couple blems on the finish, but cannot be seen unless up close. This sub is LOUD and should be used with caution. It's really only for parties or dances and such, but I have used it occasionally for personal enjoyment and it sounds great.
EDIT: WILL TRADE FOR DECENT FIXED BIKE OR CYCLOCROSS.
It's a high asking price, but I paid $800 for it, and it's less than a year old in perfect condition. I still have the original paperwork, cables, and sticker that went on the front. The picture below is a stock photo as I cannot seem to get my camera working. Please email me your offer, and I will get back to you the best I can through email. You haul it, I'll help as much as I can to get it to your truck. It fits in my sedan, so maybe it will fit in yours! Here's more about it from guitar center: