My Kef sub which is part of my 2005.2 system has developed a fault and I wondered if anyone has had a similar problem. I've just sent it off to my retailer as the one year warranty period is almost over (although someone in this forum thought Kef gave five years!) Just in case he says there's nothing wrong with it, here's what the fault sounds like. I noticed when watching LOTR the other day (for the second time) that I could here a higher pitched 'tapping' sound coming from the direction of the sub to accompany the low bass rumble on the soundtrack (you know when they cut to Mordor). I checked when the lights went up at the end of the film and noticed that the mains lead had got tucked under the cabinet and assumed the edge of the speaker cone had been tapping against the lead. Problem solved I thought! Next time i listened to that same soundtrack and other similar loud low sounds, with the sub turned on its side so I could hear it directly, it was still there This tapping or crackle sound is in time with each beat of the bass sound. The cone is perfect and moves freely so I think it's probably an electronic problem. Anyone had the same problem?