Just installed a JL 13” sub in a generic JL box that is tiny. Mounted up super high at the front of the helm opening. I mounted it up against the backrest for the bow. Kinda hard to explain so I will post pics. I wish I took some pics when I had it all apart. I powered it with a Clarion 600w rms mono block and it simply pounds. The entire boat vibrates. It is definitely hitting above its weight class.