My (very slightly) most dynamic sounding amp is my 2 watt Korneff clone 45 SET. But the difference in dynamics between this and all my other amps is so small that it's not something worth worrying about.
There are significant, very easy to notice differences in dynamics between speakers. Some speakers sound shut-in. Some speakers sound polite. Which is OK on Gregorian chanting. Terrible for Joe Cocker.
I used to think that differences in dynamics were mostly in the midrange, until I heard full sized corner horns which made me realise that bass drums should project out into the room with every drumbeat. In a spikey, attention grabbing, room piercing way.
And every small speaker I've heard has been lacking in genuine, full frequency dynamics / openness / room-commanding authority.
Amongst modern small speakers the KEF LS50's are one of the least worst ones I've heard.
Klipsch Heresy's are good for midrange dynamics, poor for bass dynamics, not helped by the too lean bass.