Not sure what electrical racket means? If it's sparks I would dump it.
If the surround on the speaker has separated you can fix that for about $15 to $20 with a surround replacement kit and some contact cement. If you still enjoy the speaker it's an easy option.
My VMPS Tallboy sub surround separated and it made lots of noise on really low tones. Once I replaced the surround it sounded new again! Very worthwhile for me.