Originally Posted by commsysman
only need to go down to 120 Hz or so and the ones you have will be OK.
It doesn't matter how many times you say this...
...it will never be true
John, I can't speak to the specific speakers you mention as i don't know them well enough; perhaps you should ask that Klipsch specific question in the Klipsch thread for more answers.
If you do decide to do an upgrade, replace the front 3 first (you can keep the sats as surrounds) but make sure that the three all timbre match and that they ALL can reproduce the signals that the movie and music producers intended to be sent to them.