I have the SF Il Cremonese and have tried several combinations of amps and preamps over the last several years. My sources are Rossini Apex DAC and AMG Viella turntable.
I listen to classical and jazz and never rock, metal or similar genre.
I found the ARCRef6 SE to be cold, clinical, and not that "faithful" to the sound of instruments. So, I replaced the ARC with a VAC Master preamp. This is highly resolving, but with its two tubes, more accurately presents the tonal qualities of the instruments. Contrary to what I would have expected, the VAC provides excellent articulation, but has a very "full" midrange sound. This "fullness" or density of sound belies the articulation and separation, that is the detail is very much present but just not "hitting you in the face" as with say the ARC or a D'Agostino. There is a slight warmth to the VAC but certainly not to the extent of "classic tubes."
My first amps for the Il Cremonese were Rogue Audio Apollo Dark Monos. These were good, but lacked control of the bass and did not provide the clarity that the speakers were capable of delivering.
So I traded"up" to a D'Agostino Momentum. MxV S250 (stereo). This allowed the speakers to display all their capabilities with a controlled bass, full midrange and excellent treble with only the slightest suggestion of brightness. But, the presentation was from the 20th row of the Orchestra or the back of a "jazz club." It was not fatiguing, but not as engaging or inspirational. Polite, refined.
So, I just traded "down" to the Simaudio Moon North Collection 861. (This is a stereo amp that can be bridged to mono.) Unfortunately, these are in short supply, so my dealer loaned me the 761 to use until my 861 arrives. I have spent the last several weeks comparing the DAG with the 761. I am waiting for the 861 to write a full comparison, but for now, here are my impressions with the 761 vs the DAG:
The 761 has a more controlled and greatly more dynamic, impactful bass. The midrange is full and very well articulated. The treble is likewise articulate and all instruments have the resonance, tonal character, and presentation that places them in the room without association to the speakers. Soundstage both w/r to width and depth is greater with the 761 than the DAG. The 761 places me in the front of the stage or around the 5th row Orchestra seats. It is a more "exciting", and therefore I feel more engaging, presentation. It is not rude, crude or abusive, but it is not the gentile politeness of the DAG.
I do believe that the synergy between a tubed preamp and the solid state amp is critical to the success of my system and I would highly recommend this combination with speakers like the Il Cremonese.
Incidentally, and importantly, the VAC only has two tubes, and the developer and owner of VAC personally informed me that in the Masters preamp, I should expect at least 2000 hours and probably more before considering replacement. They do not need biasing, so really, although tubed, the preamp is "maintenance free." (2000 hours is nearly a full year of listening every day for 8 hours... so realistically, over two years of use before considering a change.)
Importantly, I have tried various cables (Nordost Valhalla, Nordost Odin and Shunyata Sigma and Omega). The cabling totally changes the sound of the speakers. As I have written elsewhere, the Nordost cables have a mist or haze that softens the presentation and tends to decrease the articulation. The Shunyata cables are just "absent", allowing the source, preamp and amp to present the music without any loss or coloration. I highly recommend the Shunyata cables with these speakers. (Also their power cords and Denali or Everest which make a remarkable positive difference.)
Incidentally, I did try a T+A integrated at the request of the dealer. Sadly, T+A did not have their software actually working, and recommended various "work arounds" while they continued to develop the software. I got a couple of tracks to play, but the sound was clinical, non engaging, and it did not work well with the SF speakers.
I hope this helps. You have fantastic speakers