My Kube 2 had been making a "popping" sound for a period of time whenever I turned it on culminating in it blowing a fuse every time I switched it on. Not very impressed as only had it for 2 years, so took it back to Superfi to be told that it would cost over £100 to be repaired as they would just replace the whole circuit board at Kef. I've decided having read of similar problems with Kef subwoofers that I have no confidence in getting it repaired, and will probably buy another brand for peace of mind. Two that are similar prices and have good reviews are BK XLS200 and MJ Accoustics Pro 50 MkII. Any guidance on which? Does the fact the BK is 275 w compared to the MJ at 150 w make a big difference in a medium sized living room? Thanks