Hey Axel, off the Carbon, the bass is definitely stronger than the Susvara’s, although the Susvara bass is absolutely fine with a copper cable off my Hegel H95.
The SR007 MK1 is more musical than the 009S; more meat on the bones; richer tone; warmer/darker; etc.
I personally prefer the MK1 to the 009S, although the 009S is more technically proficient.
To me, the 007 does just fine as per technical parameters and the best part is, it works across all genres and tracks.
The bass actually thumps with the right chain behind it.
All Stax hps are source picky.
Funny thing: the 007 sounds better to my ears off an Aries II DAC than the Holo May, the amplifier being the same, i.e., the KGSSHV Carbon.