So I reckon it's time to get a subwoofer ... My system = KEFQ35/Q95C/60S speakers with Arcam Alpha 3 stereo amp, Yamaha DSPE492 processor but I am going to replace it with a 6.1 receiver So if I want to spend £150-£250 what should I get. Yamaha? KEF PSW1000 or 2000? Something else? Huge choice and I understand that there is no need to match the subwoofer to the main speakers ... My room is "medium" sized 4.5x6.5m.