Looking for some help on diagnosing this problem, on a Rogers LS2.
The first few seconds is a subsonic tone then I switch to a frequency sweep.
https://1drv.ms/v/s!AvReE5AaGPrehNNddC_fVKOXgWF0OA
In normal playing it sounds pretty decent and its*not immediately apparent something is wrong.
The other speaker doesn't exhibit any of this*vibration when playing the same tracks.
I can't detect any obvious air leak around the driver enclosure or cone but that isn't to say there isn't one*😉
Any advice much appreciated.*
Many thanks
Graham