Acuhorn 125 with Leben 15w amp

I tried with my Harbeth 30.1 which was fine at lower volume but not with any gusto in my 7.5x5.5x3.5m tall main lounge. My old tv setup was a pmc21 and this was
clear in mids but again wasn’t pushing enough air. Pulled out old kef104ab speakers and this
was smoother but felt a bit flabby in delivery. (And then discovered v small tear in cone) also pulled out daughters speaker wharfedale 9.1 diamond (£90) and surprisingly this sprang alive but speaker is pretty high in delivery of treble (so listening to Johnny cash I hear
cymbals in delivery more than his sonerous tones)
but amp is pretty open and transparent and I don’t recall any overblown treble apart from through wharfedale. The same circuit is used for headphone - and this is unbelievable - I liked my Arcam rHead presentation until I heard the Leben. 
Joni Mitchell now on wharfedale and treble on this is tiring ....

THX ratings are 110 or 112 db
I probably misrepresented the movie factor - I merely need it to support the occasional movie - not be a cinematic experience and just something better that the TVs built in speakers.
the amp is mainly for headphone use when I am being thoughtful of neighbours - but occasionally it does lighter music duties.