The OP's speakers have an 83dB sensitivity.
The amp's power, or the size of it's transformer is not really the issue. It's the impedance curve of the speakers that matters.
I owned 160wpc VAC amps, which I tried on my Silverline speakers which employ Dynaudio drivers. The Silverlines do not have a flat impedance curve, and the result was an aggressive, tipped-up sound without midrange weight or sufficient low end to balance the highs.
The amp's power, or the size of it's transformer is not really the issue. It's the impedance curve of the speakers that matters.
I owned 160wpc VAC amps, which I tried on my Silverline speakers which employ Dynaudio drivers. The Silverlines do not have a flat impedance curve, and the result was an aggressive, tipped-up sound without midrange weight or sufficient low end to balance the highs.