Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
That's right. The difference is entirely below 100Hz. The towers have greater extension. The standard bookshelf model is solid down to 65Hz, but the towers go almost an octave lower.
I personally like the bookshelf model when used for surrounds, and the towers when used in a stand-alone two-channel system.