After getting caught in storm the Emotiva mini-x finally showed up

It's now hooked up in my bedroom driving some
cheesy old Sony's. I was about to pull the trigger on the NHT's when I all of a sudden got concerned about their 86db sensitivity. My concern is driving these with the 50W@8ohm mini-x and NHT's reputation as being power hungry and sounding better when being adequately driven. It seems most other speakers I was looking at have a sensitivity of ~90db.
Valid concern or not?