I went out a bought a used pair of S8's including the Connection hub. I didn't have the opportunity to take a listen at sellers house, so I transported them home safely to set them up. At some frequencies the sub makes a rattling noise, sounds like a mix of a loose screw and electrical noise, however it might just be the rubber surround which is worn? What do you think? And can I fix it? The warranty ran out in March...
Take a listen. https://www.youtube.com/watch?v=EMVROLMCAKA