Related Clues:

• Rock concert equipment
• Some phones have them
• Certain projectors
• Fuse measurements
• They may stand at the side of the stage
• Current concern
• Stage items, sometimes
• Hi-fi parts
• Roadie's haul
• Intensifies, with 'up'
• Fab Four equipment
• Stereo components
• Pumps up the volume
• Band boosters
• Concert blasters