So I took the plunge and went ahead with getting the Alpine set up fitted, with sound deadening in the doors, by Advanced In Car in Poole. To my ears, there is a marked improvement in detail, presence, soundstage and instrument separation. Overall the midrange is much more present, vocals come through very well, and I am hearing stuff (especially percussion) which wasn't there before. I am still getting used to it, so time will tell and it may take a few more hours of burn in to get get the best out if it. I still find I am using the EQ to dial down treble