Inspirational Woodworking | Small Bluetooth Speaker 

It's a passive radiator not a woofer😄 The purpose is to move via energy provided from the drivers. It's an alternative to a reflex port design albeit more expensive and less efficient but it keeps the enclosure closed from moisture or debris. But yes you would be right if it was a woofer✌️

Main components are listed in description, rest are random bits from my parts bin. I didnt make drawings for this one, just calculated box dimensions that would work and wouldnt be too big. Then wired it as needed, the amplifier comes with instructions. If i were to make this again I would use different amplifer with dsp but at the time making this i couldnt find any good options