naim intro second hand from audio excellence in Swansea. i and b&w 601 s2 before from a nad 350 front power amp and a yam 1400 rest with no more speakers and a denon dvd 1600. its not a giant jump its just more. its hard to quantify its just more definition. I'm listening to led zep 4 atm and i can hear cymbals apart from the other sounds guitar etc. its more definition which is what i look for. me happy.