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.
CURRENT: 2008 SANTE 210
2000 Mastercraft Xstar
2004,2005 Ski Centurion Avalanche C4
2003, Ski Centurion Cyclone
99,2000,2001, 2002 Ski Centurion Elite V/Hurricane/lightning
88 2001 Nautique