If you are concerned then just make sure you get "tinned" wire which is the main thing that I believe all marine wire has. It's an extra layer of protection against corrosion because it is very possible for water/moisture to seep into/past basic insulation.
Automotive is definitely fine but marine wire is not a gimic. Just realize that marine grade wire by Ancor is designed to meet the uses that wakeboats don't even take on. There is a lot of corrosion out there from moisture in salt water. Normal wire will fail.
Marine primary wire is also designed to resist flame and heat for a certain amount of time (longer then automotive) before melting. If my boat catches fire, who cares if the power wire to my amps melts.
Normal wire is just copper - which corrodes fast when exposed to salt. This means sound quality is compromised and failure may come sooner than otherwise.
Ideally silver tinned or similar wiring is the better option as it lasts far longer due to a slower corroding timeframe.
If you're in fresh water I'd not be too fussed - Just spend the money on decent cables and you should be fine.
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