2021-12-02: LZ A7 mod (KZ DQ6 upgrade)
Just a headsup, if you put tuning foams into the black filters on pop settings, it sounds very close to an upgraded KZ DQ6 + Tuning foams.
All you need is this:
(high density version)
- Remove the stock metal filter on the nozzle (the side that is going into your ears) by using something like a needle or a sim card ejector.
(irreversible since it seems you cant remove it without putting a hole in it.)
Take one piece of tuning foams, and put it into the nozzle where there is now a hole. (one piece per side.)
Should look something like this now. Done 
Pop-red + high-density tuning foams > Pop-red
Bonus:
Also, if you dont have tuning foams but do have the filters that comes with the Tanchjim iems, you could substitute the foams for those filters and the results should be similar.