Maybe the seller or buyer might have that info....Doesn't look like it's worth a whole lot though http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5712644657&category=75309
It looks like it's 4 X 20Watts, peak I'd expect.
http://cgi.ebay.it/ws/eBayISAPI.dll?ViewItem&item=2470562416

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1986 560SL
2002 Toyota Camry
1993 Lexus