I own an AU 717 85wpc it works really well for powering party sound plus it has a host of cross over adjustable tone controls. There is one factual error most AUs were built in the late 70s. In 1980 or about then, they started outsourcing check to see if it has been made in Japan, those are the good ones. JBLs of what era? Check wattage and efficiency although the brand tended to be quite conservative however,the 717 seems more like 100wpc +. My early JBLs and Klipsch rock the house. For price just start watching ebay for prices, there is a site "audio classics" not the Mac site that may have valuation.
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