One of my Logitech Z5500's sub is making a vibrating noise with some bass frequencies. I already checked the inside and everything looks OK. I think is comes from one or both
Logitech Z-5500 Powered Digital Subwoofer Only TESTED AND WORKING | eBay
How to: Change subwoofer in Logitech Z-5500 | Hardware Canucks
Amazon.com: Replacement Control Pod Y Splitter Cable Compatible for Logitech Z-5500 Z5500 Dual Subwoofer System : Electronics
Logitech THX Z-5500 Subwoofer + Controller Pod | eBay
Logitech Z-5500 THX-Certified 5.1 Digital Subwoofer, Control Pod and Remote Only - mobifone.online