Turns out that you dont need balls to enjoy music... I upgraded from the 40's so the 100's are way more full in the mid range and dig a lot deeper. Oh thats right.... sorry my bad.... haven't kept up for a while... I was going to say, if you were upgrading from the 60's I wouldn't have said a word, and just plopped them down, on the outside you can't tell the difference... ;) Both the 40's and the 60s are 2 1/2 way, while the 100's have the dedicated mid for a 3 way.... I can't say I notice a huge amount of difference between the Sig S4's and the Studio 100's but I haven't taken the time to do a side by side, but I can tell the 100's have a touch more presence in the mids, but on the other hand the vote of accuracy, clarity and sound staging goes to the S4's..... but not by a great margin...