Will 2 watts monoblock 45 tube amp work for 90db speakers ?


Hi my fellow audio friends ! I got a question about low power tube amp , I recently interested in a pairs of 45 tubes low power amp , they are around 2 watts and I know they work best on higher efficiency speakers like horn , I currently have a primaluna preamp feed s ss amp to my Nola boxer s2 90 dB at 8 ohm and a pairs of sub , I wonder at normal listening level will a pairs of 45 tube amp will have enough juices to drives them ? My listening room is around 15 x 17 , any input ? 
atl4love
@rocray do you run subs along with them ?  
90db speaker is not efficient enough.  I would be looking at speaker with an efficiency above 98dB.  


Here's another option you might consider that should have no problem driving your speakers.  Not tubes, but SS Class A that does a nice job blending virtues of both tubes and SS.  Read the reviews. 

https://www.usaudiomart.com/details/649533832-valvet-e2-amplifier/

I've heard Ralph from Atmasphere say that you don't want to push tube amps to the higher end of their output range as their sound quality begins to suffer, so you may want to consider that as you search for an appropriate tube amp. 

Best of luck in your search. 
I've heard Ralph from Atmasphere say that you don't want to push tube amps to the higher end of their output range as their sound quality begins to suffer, so you may want to consider that as you search for an appropriate tube amp.
To clarify this- the statement above is true of all amps, but in the case of SETs the higher ordered harmonic distortions start to show up at about 20% of full power, so if you really want to hear what the amp does you need a speaker that allows you to run the SET with all forms of music at power levels less than 20%... in the case of a type 45 based SET, that means a speaker that is about 105dB or so at a minimum in most rooms.
@soix thank for your suggestions but I think I have a wonderful combo tube  preamp plus tube dac feed to my lovely Yamaha mx1 with dual transformer , the mx1 I purchased was 600 bucks compare to 2500 as new and I think I got a very nice combo already , for now I just want to try low power tube amp with high efficiency speaker for low volume listening