It is all in the match of the amp to your speaker, and the speaker sensitivity. If your speakers are 90dB sensitive, a modest sized room, 40wpc amps should play loud enough provided you don't want insane levels. Remember that to go from 40-80wpc only gives you 3dB, and from 80-160wpc, another 3dB, a mere click or two on the volume control.
SS integrated amps to consider among others...Odyssey Khatargo, NAD, Bryston, Tubes-Prima Luna, Manley, Vincent, CJ, Quicksilver separates and ARC.
SS integrated amps to consider among others...Odyssey Khatargo, NAD, Bryston, Tubes-Prima Luna, Manley, Vincent, CJ, Quicksilver separates and ARC.