Minimum recommended amplification requirements and amplifier matching

It most likely will sound "loud enough", but, with respect to the referenced speaker and amp, 3 important questions:
1.  Was it designed/voiced for a solid state or tube amp and particularly what does the impedance curve look like at the frequency extremes. 
2.  What is the dynamic range of the music you listen to?  Power requirements rise exponentially on peaks. 
3.  Do you plan to run it in triode or ultra-linear mode? 

I would recommend a preamp with a gain of over 20 with a tube amp. My CAT preamp with a gain of 26 drives my 3 watt 2A3 amp to realistic levels connected to a pair of 86 db Thiel 3.6's. Of course that applies to things like solo instrument and chamber music. When it comes time for a Mahler 8 or a Bruckner 9 the Levinson beasts get called up to the plate.

More importantly, can you audition those speakers with your amp?    Specs are great but don’t always tell the whole story.  I was driving a pair of 87dB eff speakers with a 40 watt el34 amp and it was plenty loud for me in a 17 x 15 x 9 room.   Current speakers are 99 dB eff and it’s ridiculous with just 40 Watts.  

+1 lowrider,
Impedance, not sensitivity is a more important value.
Should your speakers dip below 4 ohms, you little amp is going to have a hard time keeping up.
When in doubt, call the manufacturer.
B

+2 @willemj , agree completely. 
I used a 300W/Ch/4 ohms with Monitor Audio Silver 8s with good results.