Oppy - We have the exact same setup and from what I understand, most of the issues we have is that it is very underpowered unit and really beat up speakers. Our boat has 16 year old technology...so time for an upgrade.
We are currently installing a Fusion AV700 in the same location as the current jvc deck. Removing the CD changer. Adding 4 6.5" Polk Audio Speakers (MM651um) and a 10" Polk Subwoofer. now, the current speakers are 5.25 so we will need to do some cutting, but that should not be an issue. The sub is going on the port side near the stern of the boat past the sink.... We are also using the Fusion 5 channel Class D Amp and upgrading all the speaker wire to handle the power. A class D amp is important due to the power consumption of the other classes of amps. Class D is the most efficient. We added Sirus/XM, Bluetooth, iPad/iPod connectors as well a remote for the swim platform.
You want to keep the sub away from the amp due to the vibrations. You also want to allow plenty of ventilation for the amp as well as a direct power wires to the batteries.
The install should be complete in the next few weeks! (yes, we are doing this outselves)
I hope this was helpful!
Tom
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