A 6.5" woofer works well in an ATV/UTV as you are typically wearing or sitting atop the woofer. But unless it's bolted to the bottom of your seat, a 6.5" woofer will struggle to meet the challenges of a boat. Two core issues with a small woofer. First, a 6.5" woofer will have to travel three times as far to equal a 10" woofer output. The woofer that travels the least to make an equal output always sounds the best. Second, it takes either four times the excursion or four times the surface area to produce one octave lower bass at an equal output. So a 6.5" woofer isn't going to play very low in an open air environment. Rather it will be limited to more of a midbass driver. Again, heaven sent for an ATV/UTV but over-matched in a boat. So if you want to keep it small, keep it simple, keep it economical, and use it in a boat, start with the powered/enclosed/10" Wetsounds subwoofer.
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