Speaker technology has come a long way since back then. Why throw good money at a bad solution. Are you looking at getting tunes back to your rider or getting some quality sound around around the boat for partying. If the answer is rider I would consider going HLCD. You now have a reason to upgrade so why not do it right the first time.
2000 X-Star, 3000lbs ballast, LTR 330, Acme 1235 14.5X14.25prop.