Pyle bandpass box PLBWS210" how good are they and what is the box made of can it be used in a boat?

Honestly...

Pyle is one of the worst brands on the market.

The box is probably made of MDF, which swells and seperates when exposed to moisture.

I have never heard bandpass boxes in open air applications. I have installed both sealed and ported subs in boats in the past, and have found that sealed boxes sound better in open air applications.

I would look into the powered subs in plastic molded enclosures. They do make marine audio products with coated, moisture proof circuit boards.

well I dont no about pyle bandpass but it should bo ok bandpass is just like a normal subwoofer but they are made for lower Hz which means lower bass. and badpass you can use in a car boot.

there pretty bad. and yes, about any box can be used in a boat.

good luck