Related Clues:

• PA system components
• Guitar blasters
• Concert-stage lineup
• They're schlepped on tours
• Elec. units
• Hi-fi components
• Music boosters
• Intensifies, with ''up''
• Guitar store items
• Concert stack
• Concert-stage gear
• Rock band's equipment
• Increases, with ''up''
• Rock-band boosters
• Rock-concert equipment