Re: Can I use a non-marine amplifier in my boat safely?
If your concern is SAFETY (ie: electrical shock), I don't believe that the automotive is more or less safe than a marine unit. Most safety concerns arise from being or not being IGNITION PROTECTED. That is, when placed in an explosive atmosphere (gasoline vapors) will the device produce a spark that may ignite those vapors and possibly cause an explosion. Anything placed in the bilge (where gasoline vapors will collect) must be MARINE - Ignition Protected.
Your amplifier placed in a warm dry cabin will work ....................... but salt air can be corrosive. If you boat in salt water, be prepared to throw that amp away after a few years. Marine electronics should use conformal coatings to protect the circuit boards and components (at least the good quality ones use coatings).
So - Enjoy the tunes and have a safet boating season !
John D