Nothing exotic, but it blows away the factory installed system for volume and clarity.
Alpine CDA-9856 head unit with I-POD and Sirius.
four 7.7 JL Audio coaxial speakers in the cockpit, I left the 2
Factory installed 6.5" speakers in the cabin alone.
one 10" JL Audio subwoofer in cockpit.
one JL Audio M1400 class D 400 watt monoblock subwoofer amp.
one JL Audio M4300 class a/b 300 watt 4-channel full-range amp.
I also added a automatic charging relay/isolator with a group
27 deep cycle marine battery to power it all when I am not
running or on shore power.