There might have been enough stored in the caps in the first case if they moved when unplugged. There is sometimes some very low material that is not musical; I have notices this on a CD as well. Some kind of artifact from the recording process is my best guess. I can't explain some of the weird things MY system does so this is the best I can do on yours.
What causes speaker cone to extend when...
Recently I made two changes to my audio system and each time I noticed the speaker cones made several large extensions while playing music before settling down (that is, the whole cone moved in and out from the rubber surrounds). It was almost like they had a hiccup. The music was playing and everything sounded OK. The first time was when I disconnected my speaker cables from the amp - everything was turned off by the way - and replaced with new cables. The second time was when I disconnected my turntable, made some changes, then plugged it in again, along with new phono interconnects.
I was wondering what could cause such a reaction; e.g., could it be new voltages moving through the system?
I was wondering what could cause such a reaction; e.g., could it be new voltages moving through the system?