@kumizi I have the CODA #11 now, so it is similar to your setup. I also know KEF well and was on the path to get a Reference 3 or a Blade before I got something else. I also owned the #8 v1 but did not hear it with the D-1 or MA3i
I think the both the MA3i and the D-1 would work well with your gear. Imersiv has a way to hook up subs to the D-1 though I have not investigated that. The main issue would be if you need a preamp. If so, I would go with the MA3i.
My friend Danny has both the MA3i and D-1 that I demoed at home at the same time. He is a tube guy (builds gear) and loves the MA3i and likes the D-1 but not as much as the MA3i. He is the principle at Requisite Audio in Ventura, CA. I met him long ago after I learned about the RAAL Requisite SR1a earphone (still use it).
From reading the comments and reviews, I understand many might find the D1 too revealing and analytical but that sounds right up my alley.
I can never understand how something can be too revealing. Not in my books, the more the better. I want to be there in person in the studio or the live performance.
Now I usually discount lots of revealing gear because I get fatigue easily or it sounds thin. The Benchmark DAC3B for example is revealing but hot on top and nothing like the D-1. I owned all the Benchmark DACs going back DAC1.
I think the MA3i and the D-1 are great DACs because I listen to more music with these 2 DACs, especially the D-1. For example, the Lana Delray (sp?) which is often mentioned in audio reviews was an album where I like only a few songs. However, through the D-1 I listen to the album from start to finish,

