Marine Stereo Systems?

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IMHO - any stereo less then 50,000 watts is worthless

Seriously - the real difference in a marine radio is how the board gets treated and O ring seals.

Salt air often finds a way in but they do hold up better then a regular radio.

The cases with a O ring seal help too.

One tip - be sure to play it / tune it at least once a month - even in winter.
Helps keep everything in working order.

Using tinned wired for speakers goes a long way too.