Are you satisfied with the audio of MacBook? If not, the BassJump subwoofer manufactured by Twelve South will enhance the audio quality of MacBook.
The aluminum-bodied BassJump subwoofer is a external subwoofer connected your MacBook with USB port. and it comes with a professional software for controlling the sound output.
BassJump is priced at $79.99 USD. You can get its full features or buy it at its official website