even it is a TWS. With proper ear tips, KZ SKS is one of the best tuned out of KZ from my 20+ KZ experience! Wow! KZ nailed it! Not a typical 30095. It sounds harman-ish W-shape tuning, no big spikes, smooth and bass focused.
I can recall this sound signature as a bit brighter Mangird Tea. This brings me hope for AST, it might actually work! AST uses a bunch of #30019 BAs which SKS uses 1x custom-tuned 30019 +10mm DD.
[Update]
SKS seemed to have a 3khz pinna gain peaks like the one of those in Moondrop Blessing 2 Dusk or Softears RSV.
If it matches your gain spots, it resonates very well for female vocals/guitar/snare drums.
I thought mid-range specialty was one of CCA's, but KZ seemed is leaning toward mid-range focused rather than typical V-shaped harsh tuning.
SKS has a wide sound stage, like CCA CSN, with bass-rolled Harman-ish with 3khz gain spot hitting tuning. (W-Shaped, warm, bass-rolled wide sound stage)
Honestly, I prefer this tuning over ZAX, it doesn't extend treble and air too much so that the technical weakness of KZ tweeter BA drivers could stay subtle.
Kudos to KZ engineers who tuned SKS.
SKS matches with the thin-skinned bass-boost type of ear tips, like Sony hybrids. I use one of UM's. SKS is generally warm. For $29 on Aliexpress ($48 on Amazon, nah) SKS is a good blind buy even compared to wired IEMs of the range, for someone looking fun and warm-tuned pair of IEM.
[Update 2] It doesn't sound too good with AAC with iPhone. AptX has a better dynamic range and heavy bass slam with warm textures overall.