Speaker Efficiency

So much goes into the design of an amplifier.  Transformers, power supply section, parts selection, etc.  Audio Note, V-Caps, point-to-point wiring, copper chassis, etc.  Then there is the implementation to reduce the noise level.  In typically lower priced amplifiers, there are limitations based mainly on those factors.  Mid-range may sound fantastic but the overall bass and high end extension are limited.  Most people don't here the limitations until they have a direct comparison from something that is not limited in sound reproduction.  Just spend a day at a local dealer and we were discussing this within the various brands of manufacturers he offers.  Even between the lineup of some manufacturers you can hear the transformers influencing the sound and not always the more expensive unit was better.

Good into here though.

I have a 300b Amp driving my Forte and it is a great sounding combo but it will run out of steam if you push it....which I don't.   The sweet spot for those amps are a few watts, not their full rated power.   

Those same speakers will play considerably louder with my Quicksilver. Amps that are 40 watts but they lack that beautiful tone that my WE 300bs have.   

I have a pair of Sonus Faber in my bedroom powered by a 40 watt Cyrus Integrated Amp.   That Amp drives the SF easily but being 85 dB sensitive they aren't the best match.  Again, they sound great until you push them.   Those are being replaced in a few days with Omega speakers that have a sens of 94.5 dB / w and should be a better match.    

I like low power amps but it limits your choice of speakers.   A lot.   I could see where Forte and a 300b amp would not be a good match,  it's not a lot of power and could be a problem with large rooms especially if the owner likes to crank it up.  Those amp's "forte" is awesome tone, not  high volume levels.

Raise your hand if you're just repeating what a dealer told you to sell you a more powerful (and more expensive) amp?

Obviously all parts of the system chain make a difference, but few make more difference than the speakers. Especially how they interact with the room and present a soundstage.

If you love the sound of the Electa Amator speakers, I’d look to get bigger tube amp. Even if it’s PP vs SET, there are some great sounding PP examples that would drive the Amator to the desired sound level.

On a side note - Not sure if you're running a sub, but a well setup pair of smallish active subs could be a nice pairing with your speakers/system.

I have moved from 87 db on 94 db speakers. Much much better , also for the amp.