Related Clues:

• Using sound waves
• Very pleasant short sort of boom
• Using sound that's perfectly delightful when abbreviated
• Sort of boom very pleasant after cutting back
• Some cappuccino served up extra quick
• Pertaining to sound
• ___ boom (airplane effect)
• Chain that claims to be 'America's Drive-In'
• Seattle hoopster, once
• "Super" or "ultra" ender
• Lad in charge of sound
• Best boy, maybe, in charge of sound?
• Describing a boom in the travel industry
• Voiced by child worker
• Describing a boom in unusual coins?