Did the series1 speakers have a different/better sound to the MK2 version? I owned a pair of MK1 & MK2 RTL3's and I am convinced thet the first one sounded better with a fuller deeper bass. but then that could have been positioning as I owned them in different homes. I know the drivers are different on each generation but as I am looking to pick up a pair again it would be good to know wether older is better?