Related Clues:

• Dual-channel
• Man cave system
• Standard auto feature
• Retro record player
• System with speakers
• Multichannel
• Not one-sided, in a way
• 3-D, as photos, in NASA-speak
• Typical opening?
• Music room system
• Audio setup
• Austere oast houses shown in 3-D
• Lead-in to phonic
• Coming from two speakers
• Before entering stone circle, sound heard from both sides