DIGITAL DESIGNS AUDIO DDZ 99Za 15” Subwoofers Dvc2 Carbon Composit Cap And Cone - $2,500.00. FOR SALE! These are arguably the strongest speakers ever made They were refurbished by DD and hardly played on they ate ridiculously stiff This is your chance to own a set of speakers that own the spl...
To be totally honest, I have no idea. Maybe contact DD Audio directly and see what they say ? You can also throw it on eBay with a buy it now or best offer and see if you get any potential buyers.