Slightly more info now sat having a good listen to all my CD's again.
Much easier to follow all aspects of the track. Very refined, superb control on the bass. Really open sound, lots of subtle details there that I had never ever noticed on the XS. It drags you into the music, before you know it the CD has finished. Everything is handled with ease, nothing is strained, forced all very natural and there just appears to be no limit on the available power. This combination isnt shouting or showing off, it just does its job - very very well.
No complaints whatsoever. 🙂