Sadly, don't have the black/gold. I should of picked up that version instead of the black/silver. These were my 2nd buds ever, after picking up the snow lotus 1+ off of amazon to get my feet wet in the buds world.
However, I'm quite certain the black/gold aren't close to the em5. The em5 have insane bass detail and presence (not overpowering but complex). The soundstage is also on another level w/ the em5
K cause of the folks who own both Black Gold and Black Silver, they say the Black Silver is a downgrade.
When amped, the Black Gold has almost jaw rattling subbass, I never ever thought the day would come when I can hear this kinda subbass in a earbud! Basshead approved for sure.
Though maybe the bass isn't that textured and detailed as some IEMs I have used, but still better than some midfi earbuds I've tried. SMABAT ST10S Black Gold' soundstage isn't the best in a earbud, but it has excellent technical performance.