What component is responsible for dynamics ?

Unless one is using very dynamic speakers, which as you describe, you are not, different speakers are the way to increase dynamics. Amps, preamps, phono stages, cartridges can vary brand to brand and model to model in dynamics, so you can enhance dynamics without changing speakers. But, again, for sure, speakers are the way to get major improvements.

Kiddman, are you saying that the Grand Veenas aren't dynamic?

Tbg ;
I have not heard any of the Referance 3a floorstanders and
don't know if the design aspects , described by Martyk1 above , apply to them or just to the standmount versions .

Can anyone enlighten me about that ?

Thank you

amplifier is the main component responsible for dynamics, install a 400 watter Krell with crap CD player and crap (full range) speaker and you will still gets tons of dynamics.. it may sound like crap but still dynamics

the notion to get a higher sensitivity speaker is so that your amp can drive it properly