Two NAD 2200 bridged amps w/6 ohm speakers - OK?

My brother-in-law has lent me two NAD 2200 power amps and my current two-channel setup includes two Thiel CS2 speakers - 6 ohms and efficiency of 87 (I forget the units). My high end dealer here in town told me (when I thought I had 4 ohm speakers) to not use these amps in bridge mode with 4 ohm speakers, that the NAD amps would not like seeing the 2 ohm load. (And then, I've read in one forum the offhand remark that these amps are stable down to 1 ohm.)

Well, I have 6 ohm speakers, should I go ahead and try the amps in bridged mode? If I keep the volume at low to medium, will I mitigate my risk, or will the amplifiers be unhappy with 6 ohm speakers regardless of the volume? If I get too ambitious, do these amplifiers have protection circuitry, or will they just fry? How will I know if the amps are starting to complain - heat? Any chance of damaging my speakers before an amp shuts down?

Also, these speakers seem to spend most of their "time" between 7 and 9 ohms (see chart in this article:
http://www.stereophile.com/content/thiel-cs2-loudspeaker-measurements ). Is the fact that at most frequencies the speakers are above 6 ohms of any benefit?

I've searched many forums for several hours, for three or four days, but can find no info other than if one uses 8 ohm speakers with these amps in Bridge mode, one will certainly be OK. So, if anyone has experience with using these amps with 6 ohm speakers, or know what to try, not to try, how to be careful - or just want to recommend: don't do it! - I'll be glad to hear your suggestions. (Except, bi-amping is not an option with these speakers- that would have been too easy.)

THANKS very much.