Replace Boat Speaker Wires

[feb]

I have a 17 year old boat that has the original speaker wire in it. The head unit is a typical Sony unit, about 4 years old. I've recently replaced all 4 speakers with some Infinitys. I'm not an audiophile and don't need to crank my music. I just want to listen to the radio/CD from time to time. But even with what I have, the sound is very tinny and hissy. Its more annoying to listen to it than not.

I'm wondering if I it would improve my situation if I replace all of the speaker wire with 18ga. It wouldn't be too difficult to do but not sure if it would even help.

For the boats age, its hard to justify a completely new setup so I'm looking for a Band-Aid .vs. a facelift.

Any advice?

Thank you.