Amazon.com: Logitech Z-5500 THX-Certified 5.1 Digital Surround Sound Speaker System : Electronics
Look inside Logitech Z-5500 5.1 Speakers + trying to remove sub grill - YouTube
Z-5500 - Logitech Z-5500 - Audiofanzine
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