BassBarrel Wireless Speaker Black. BassBarrel is the latest wireless portable speaker from Moki. By using a multi directional, rotating control panel, it allows you to focus sound where you need it. Using a 3W main speaker, along with a 4 inch sub-woofer, BassBarrel is capable of pumping out a rich, powerful sound with bass that must be heard to be believed. With a multitude of in-built playback options to choose from including SD card, USB / Flash sticks, 3.5mm, BassBarrel is the ideal portable speaker for any occasion.