you guys really find a clear noticeable sound difference between the tower and Sierra-1 with the same tweeter? I remember comparing the Studio 60 to the studio 20s, I came away with that it didn't make that much of a difference and maybe towers were just needed for bigger spaces, then I heard the Seirra-1s in a large room and they had no problem. I should say that a sub was used when comparing but I spent some good time a/bing the studio 60 to the 20s from the same source, same movie scene and songs with all the same equipment and if I was blind folded I would have a really hard time picking them apart. You guys are finding a clear and noticeable difference between NrT Sierra-1s to the NrT towers? with a good sub in play you think you could easily pick them apart blind folded?