Related Clues:

• Den system
• Successor of 31-Across
• Boob tube (and a hint to 17- and 65-Across and 11- and 30-Down)
• Den fixture
• Den music setup
• Surround-sound device
• Like iPods
• Two-channel
• Tube, so to speak
• Disc holder
• Coming from both sides
• Entertainment system
• Successor to mono
• Word on later LPs
• Family-room staple