4 Ohm Speakers, 8 Ohm Amps

World;

I own a pair of Vienna Acoustics Beethoven's and a Maestro center channel. I have been using a Carver 806x amp to power all of the speakers (the sides and rears are 4 Waltz's). I have just purchased a pair of Carver Silver 9T's to power the Beethoven’s and I was going to bridge two of the channels on the 806x to accommodate the Maestro center.
I was on the phone with Rita from the Carver Service Center talking about the bridging method, but when I told her I had 4-Ohm speakers she IMMEDIATELY said, "Carver is not responsible for damage to the speakers or the amps." Rita said that they do not recommend driving 4-Ohm speakers with the 806x or the Silver 9T's. I was also told that bridging is not recommended for 4-Ohm speakers. Believe me, I am a little lost because the science of this does not make that much sense, but that is why I am writing this email to solicit ideas and opinions and possibly a solution to my dilemma.

DMH