Ah see now your talking science. That's what makes the Millie series from hertz so great!!! A normal curved cone speaker would have some issues with sound waves impedance just like Tailwind said. However hertz redesigned the cone to more of a "v" style to throw the sound further out to the edges of the speaker in an effort to reduce the loss of sound with the tweeters being in the middle. As a unfortunately seen result it created more of a surround sound effect out of the speakers.

Man this audio stuff is AWESOME lol

 

Do you think the Mille 6.5" alone will out perform SV 6.5" with tweeter mounted in it's grill? As far as volume? Thanks, Ed