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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
cal3713's avatar
cal3713
1,421 posts
 
And if you don't have a DMM, they're worth having around... I bought this one for $25 and it does just fine.

https://www.amazon.com/Alloet-True-RMS-Digital-Multimeter-Voltage/dp/B072JMBLJS/ref=asc_df_B072JMBLJ...
atl4love OP
91 posts
 
@cal3713 thank for your info , this is very handy tool to have 
atmasphere's avatar
atmasphere
12,152 posts
 
think I would be looking for speakers in the 94-98 db eff range for use with a 45 SET amp....they are really about 1.5 watts, 2 watts is pushing them pretty hard.
Actually 1.5 watts is about double what you traditionally get out of a 45.  You really do need speakers that are more efficient. I ran some old full range speakers that were rated 99dB with my 45 SETs in my bedroom- and that was volume challenged- they sounded loud not because they were but simply due to those higher ordered harmonics I mentioned earlier. The ear uses those to sense sound pressure, so when the amp makes them it sounds louder than it really is. The problem is, it doesn't sound as nice when it does that.
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