"An extremely low-priced UTV sound bar with a solid build but critical spec omissions."
The 'four 4-inch subwoofers' are actually standard woofers. They'll be louder and fuller than your phone, but cannot physically produce deep sub-bass, especially while competing with engine and wind noise.
This is for a buyer on a strict budget who needs a powered sound solution and is willing to accept the significant risk of the unknown weatherproofing. The aluminum body is a legitimate advantage over all-plastic units at this rock-bottom price point.
Anyone riding in wet, muddy, or dusty conditions should be extremely wary of the missing IP rating. Buyers seeking genuine deep bass or guaranteed high volume to overcome significant engine noise should look at options with transparent power specifications.