I bought a GK400RB210III on ebay, and when I got it plugged in, the speakers were buzzing like crazy, even at low volume. I am assuming they are blown (haven't checked impedance yet). Trying to settle with seller, but I assume I will have to replace the drivers. Any recommendations (I am currently looking at Eminence BP102). Also, if anyone has a pair of 10" bass drivers in good shape they are looking to unload for reasonable price, let me know.