Hi there,another harmonix xdc2 arrived yesterday and has done the trick nicely,smoother tops,clear warm mids and good bass.Got a ps audio ac 12 arriving next week and well see how that goes.Im not sure how good that pc is.As Ive changed a lot of gear lately,im trying to tune it in.These kef ls 50 speakers are demanding little buggers,but they do a lot of good things for there size,which has been my aim,down size the speakers.cheers