Related Clues:

• Box in an arena?
• Sound system component
• Energize, with ''up''
• Vol. increaser
• Speaker's position?
• Sound blaster at a concert
• Band equipment component
• Elec. current unit
• Concert piece
• Underboss's subordinate
• Touring band's equipment
• Transmitter component
• Excite, with "up"
• Small amount of juice?
• Turn (up), as intensity