Related Clues:

• Intensify, with 'up'
• Rock band need
• Concert stage item
• It pumps up the volume
• Performance piece?
• Brief current matters
• Concert stage equipment
• Arena rock need
• Concert stage sights
• Electrician's concerns
• They're lugged to concerts
• Make loud
• Gig component
• One could go up to 11 in 'This Is Spinal Tap'
• Item of concern in a sound check