Related Clues:

• Concert booster
• Electrical measure
• Music box?
• Current measurement
• Syndicate chief
• Sound carrier
• Rock blaster?
• Loudness increaser, at a concert
• Syndicate V.I.P.
• Gig equipment
• Mafia head
• Syndicate biggie
• Hi-fi component
• Rock concert equipment
• Underworld higher-up