After a recent clean up and wire tidy to prepare for the new tv, I re calibrated the audio to thx reference levels At V high levels the tweeter on the front left 602s2 had a slight crackle. I checked the others and they were fine , so i swapped channels on the amp to see if it was a dirty channel. Turns out it was the tweeter so i phoned B&W - holding breath and shaking credit card! - a lovely helpful lady answered and within 5 mins i had ordered 2 new tweeters(spare just in case) and they threw in some new gold binding posts - i dont bi wire. All in it was 55 quid including delivery. They also phoned me to check if the delivery had arrived and then phoned city link on my behalf to tell them i was on my way. So I will happily recommend B&W to anyone and keep these lovely speakers for a good while longer.