Related Clues:

• Bit of concert gear
• Box at a concert
• Rock music sound booster
• Concert device
• Sound sys. unit
• Metal box?
• Rap concert box
• Gig hookup
• Stage box
• Sound-boosting device
• Rock concert booster
• Device at a concert
• Piece of equipment for a band
• Sound system booster
• __ Energy: PepsiCo drink