Also, it's not just the extra drivers, it's the configuration. The 100 has two mids with one tweeter in the middle. The 150 has 3 mids with a tweeter on either side of them, theoretically giving better dispersion.

I use the word "theoretically" because I don't even have my 150 yet. It arrives tomorrow. (So, shut up then, Jack )

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton