ColdsnapBry
500+ Head-Fier
I had both, as well. They are both warm but the LCD2C is more like warm and metallic, it's got that planar sharpness. And depending on your head size, and the resulting ability to get a seal, it could really shake my brain with the sub-bass. When I was reading about the LCD2C before I bought it, I was confused by how many people called it a skull rumbler while some said it wasn't - I ended up understanding that, if your head is large enough to really get a tight seal, it was like strapping your head in for a rumbling rollercoaster of bass. It was nuts! But if you couldn't get a seal, it was just a warm bassy planar.
So where the LCD2C was kind of metallic and brittle, with all the technicalities made audible, the Aeolus is much more liquid and smooth, and so some of those technicalities might get blended into the syrup but the syrup is still so sweet and natural and musical. The Aeolus (on an SW51+ but soon a modded Crack) is a perfect complement to my Staxen, which are better versions (imo) of the LCD2C sound (with less sub-bass, though my ES-1a is close to it).
Curious why you are going to a modded crack? I have a SW51+ and was thinking of trying out a crack. But I was thinking the SW51+ is probably the best amp for the Aeolus.