Related Clues:

• Reminder
• Recording-chamber effect
• Reflected sound
• It might be off the wall
• Lover of Narcissus
• Sound on the rebound
• Type of chamber
• Sonic bounce
• Bounce off
• Cave comeback
• Off-the-wall product
• Cavern feature
• Sound in a long hallway
• It's said once but heard twice
• Mythical nymph