My experience is that airless sprayers are great for painting fences. I would build them , listen to them and if you really like what you hear then decide how to finish them. I see guys smearing on duratex coatings and it galls the shit outta me, lazy man short cut imho. Either invest in a HVLP which are not that expensive anymore, the down side is cleanup is a bitch. I spent 150 on a 10 gallon can of gun wash, cause if the gun aint clean you dont get results. The speakers are too big to spray out of a aerosol can so thats out. I say get wood veneer its the best all around covering and not real hard to do. Have a look at what Axiom charges for their premium finishes , there is a reason its so expensive, it takes a lot of work and equipment.

DOG is GOD spelled backwards.
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M80 V3 MY GLOSS Cherry