*AP Treated butyl surrounds, 6.5" treated paper cone, 1" titanium dome tweeter, all drivers sweep tested OK, Audio Pro modified x-over added low frequency filter / added 4x ferrite slugs, more natural voice, woofer coil corrected / hi frequency current, much improved fidelity, slight redamping cab, dacron port cover, very nice sounding version! good deep bass powerful woofer, real cherry cabinets, black knit grills - some "water" stains on back of cabinets, condition #9