What component is responsible for dynamics ?

Well , thank you for your contributions one and all .
I figured that the system as a whole would be a "total" contributing factor . Kind of like every other aspect of the sound . What I was looking for was the one that would make the biggest difference and the speaker seems like that one component . I guess that is why I posted my querry in this forum .
I do find it interesting that the efficiency of the speaker has an effect on the dynamics .

Duke and John;
You two build with two different driver designs , is there an opinion on the type of drivers that work best for dynamics ? I don't want to start a battle here , just personal opinions .

Again , thank you one and all .

Rok ;
Yes one correct answer would be nice . But usually just a major consensus is the best that there is .

Sure : Reference 3A Di Capo i speakers
Primaluna Prologue II integrated amp
Granite 657 CDP

I am in a small 10ft. X 11ft. room with wall to wall carpet and 8ft. ceilings . I use some room treatments , 8th Nerve , consisting of pads in the corners and above the speakers where the walls meet the ceiling . I have the speakers and listening position set up on the diagonal with the listening position and speaker seperation set in an equal lateral triangle of 6ft . The speakers are firing staight forward , no toe in .
I play the CDP through the tube side using the stock tube.
The amp has had the tubes rolled to EH EL34's on the output and Mullard 12AX7 & Radiotechnique 12AU7 on the input . I am using a M. Wolffe Source P/C and ZSquared au/au IC's .

Hope it helps.

Wow , I had forgotten about this post !

How does this sound in answering my question here ?
This is an excerp from a post asking for feedback on Reference 3a speakers :

03-29-13: Martykl
I had deCapos for quite a while. I think they employ a very specific set of trade-offs to achieve a specific result.

They combine better bass extension than most stand mounted monitors with a truly neutral octave to octave tonal balance. That's unusual IME because the lack of true bottom end energy (true of this and basically all other small box speakers) requires limiting the output thru the presence and treble region to maintain the octave to octave neutrality. Most manufacturers seem to maintain more output in the upper octaves so that the speaker sounds more dynamic. The result - to my ear - is that the vast majority of stand mounted monitors tend toward a bright voicing that would benefit from the addition of a subwoofer.

The real world result of the Ref 3a approach is a monitor that sounds really neutral. It doesn't really invite the use of a subwoofer - it would sound bottom heavy if you added one. OTOH, it definitely struck me as polite sounding and limited in dynamics.

To my ear, maintaining neutral balance at the expense of dynamic "jump factor" is a wise trade. However, IMO, that is the price that was paid in this design.

This could explain the lack of dynamics in my system .

Any comments on this explaination ?

Thank you

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

Impact is a good term .
What I am refering to is the 'aspect' of a system that makes you want to tap your foot , bob your head , play air guitar , conduct the orchestra or get up and boogy !
I have another set of cheapy speakers that offer some of these characteristics . Now granted they don't have the extension , detail or clarity of my other speakers but they are exciting . If I could find something that combines these two speakers together that would be nice .