On White Hoarhound, there is a massive amount of texture, slam and sub bass rumble. The rhythm guitar is on approx the same depth plane as the vocals, which is full frontal.
The soloing is a bit in the background, which is how it sounds on the Atrium in my system.
On this amazing Messa track, The rhythm and lead that come in around 1:45 are hard as hell, you can clearly hear two distinct guitar tracks, lower tuned is upper left, and higher tuned lower right, vocals again front and center about on the same plane.
The acoustic picking is distinct and clear and forward, and when the Iommi-esq electric guitar comes in it wraps around your skull. This is killer!
guitars are full of texture, right at ear level depth, with the ethereal vocals several steps back. Drums roll behind your skull.
This is really intense. When the 2nd guitar comes in around 0:56 its like your head is inside a vacuum with that part. Very, very vivid and there's a lot going on in this track that lesser headphones would just blend in. Great layering.
Opening drums on Ahab's The Pacific have such a heavy weight to them and gorgeous decay and when the the rest of the band kicks in it's like you're being crushed to death. The weight, texture, depth and layering is such a unique combo. Even the vocals have their own space, but still cant understand a damn thing he's saying. When the acoustic guitar kicks in around the 5 minute mark, theyre fully up front. Funeral doom at its finest!
When you speed things up, it's where you're left with your jaw on your chest. This headphone absolutely shreds! No lag. No blur. No muddiness. Just awesome! Man this track is brilliant on the Caldera!
IMHO I prefer the decay and tonality of the Atrium more, but the Caldera has the speed & layering and it allows me to peer deeper into a track. There's so much more going on in metal tracks than one realizes until you hear it on the Caldera.
EDIT: using the Cayin IHA 6 as an amp.