I haven't heard the Dyns before, but I have heard the Simaudio I5 (with Simaudio Nova and both JMLabs and Paradigm 100v2 speakers) and the Plinius 9200 (with MF Tri-Vista cd and Sonus Faber speakers).
The Plinius had very deep extended bass which sounded over-pronounced and unnatural to my ears. It also managed to muddy all of the mid-range details in orchestral music. But it was very powerful.
The I5's bass does not extend very far, but it is very fast and well-controlled. This lack of bass extension may not be important for your bookshelf speakers. It has extremely good imaging, and it is very resolving. After I put the I5 in my system, I had to put a isolation transformer on my cd player to get rid of high frequency hash that was not audible with my old amplifier. Now I can hear background details like the air conditioning system purring and clicking on 'Mining for Gold' on the Cowboy Junkies 'Trinity Sessions' album. On the 'Misguided Angel' track, I noticed for the first time that there are male backing vocals on the chorus.
The Plinius had very deep extended bass which sounded over-pronounced and unnatural to my ears. It also managed to muddy all of the mid-range details in orchestral music. But it was very powerful.
The I5's bass does not extend very far, but it is very fast and well-controlled. This lack of bass extension may not be important for your bookshelf speakers. It has extremely good imaging, and it is very resolving. After I put the I5 in my system, I had to put a isolation transformer on my cd player to get rid of high frequency hash that was not audible with my old amplifier. Now I can hear background details like the air conditioning system purring and clicking on 'Mining for Gold' on the Cowboy Junkies 'Trinity Sessions' album. On the 'Misguided Angel' track, I noticed for the first time that there are male backing vocals on the chorus.