would using the onkyo a9150 with Thiel CS6 speakers be safe?

Because the Thiels stay under 4 ohms all the time and the Onkyo only has 60 watts per channel..  I'm afraid of damaging the speakers if the amp was a mismatch or too underpowered.

Thank you for your answers. With great fear i badly shoehorned my Nordost Valhalla cables into the too tight area and the posts are slightly too wide to get a complete fit (which scared me)  I hooked my Dac up into the Mains In and nearly had a heart attack because some set-up called Direct button disabled the volume n on the integrated amp and allowed the full volume of the Dac to come roaring through.  I ran to the computer to pause the music and then lowered the Dac volume to about 40 from 100.  I think I could go to a line in and that would allow the integrated volume knob to work.  I'm praying that i didn't damage the tweeters...it was horrible sound when that happened.  I own a Krell FPB with the KCT preamp but for the umpteenth time the amp is going back for repair due to shutdown failure.  I am going to very careful with the volume with this set-up.

Sure, I'm just trying to play my thiels versus my goodwill stereo instead.  I just didn't want to damage the Thiels.  I am not playing it at any good volume.