Logitech Z4 review: Logitech Z4 - The Tech Edvocate
Logitech Z4 Subwoofer Only | eBay
Logitech Z4 vs. Bose Soundtouch 20? I could get a Bose for 250 € to replace my Z4+LG Smartphone setup. You think it's worth it soundwise? : r/Soundbars
How to remove Logitech Z4 speaker subwoofer grill - YouTube
Logitech Z4 Computer Subwoofer Speakers w/ Control Pod Complete Set Tested Great | eBay
Amazon.com: Replacement Control Pod Compatible for Logitech Z-4 Computer Speakers z4 Remote Volume Ctrl : Electronics