Report "I have a pair of kef q35's and one has a driver that is broken. I have another driver which i got on ebay to replace the broken one but this one doesnt work. I have noticed that the model number is different on this new driver(b160 1374) and the broken driver being (b160 sp1445). yet both come from the same type of speaker. why are they different and where can i get one that is the same as the one i have? many thanks"