Just to set the scene I used to have a set of Mordaunt Short MS25i Floorstanders which were at the end of a big(ish) room (12m x 5m) sat on a concrete (ground) floor. They sounded truly spectacular. Unfortunately my flat was flooded and the speakers had their chips. As a result I had to move to a MUCH smaller flat (4m x 4m max!) and invest in a new set of speakers. Due to the excellent reviews I invested in a set of Wharfedale Diamond 9.1's, a set of Atacama speaker stands and some new speaker cable. However the speakers sounded very disappointing. They did sound a bit better with some running in but I was extremely unimpressed given the glowing reviews they had received. Then the treble started cutting out occasionally on one of the speakers. Swapped things around and it was definitely the speaker. It could be shocked back into life by turning the volume right up. I guessed it was a problem with the crossover or the cone was freezing (if this is possible?). Anyhoo I eventually had them changed and got a replacement set. Right out of the box they have sounded much sweeter. More bass and a much nicer, more balanced sound altogether. So my question is, is it possible to get different performance from the same model speakers? Can they be better made/wired/assembled? Seems strange to me but I am convinced they sound better.