Boss Audio ASK904B.64 Bluetooth Amplifier w 4 Speakers The Boss Audio ASK904B.64 is a audio package that includes a 4-channel amplifier, four marine speakers, a universal USB cable, and a phone pouch. This amplifier features Bluetooth Audio, allowing you to enjoy your favorite music or streaming service wirelessly. Both the amplifier and speakers are manufactured to be fully marinized. Utilizing high-tech waterproofing materials and special UV coatings, these electronics are built to withstand h