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Thank you so much for this instructable, I bought a 15 inch passive PA speaker on a whim a month ago and have learnt a great deal of what i know now about electronics and speakers just from this one article, i bought one of these amps which i cannot speak highly enough of and would recommend to anyone! costs 15 dollars shipped to australia, http://www.ebay.com/itm/171977997195?_trksid=p2060... i am currently running this off a 7 amp hour gel cell battery and have attached a solar panel to the circuit to charge my battery and give extra power to the amp as i use it (not that it needs it) i even connected my solar panel directly to my amp the other day and it ran the speaker wonderfully in full sun!
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