I found a major discovery, using micropore tape to cover this vent on the E1000:
E1000 (micropore mod) VS E3000:
Cleaner bass on the E1000 due to it being tighter and maybe a tiny bit faster as well. Mids and treble tonality are better as well due to the overall sound being cleaner and less warm/thick. Better imaging and instrument separation due to the cleaner bass on the E1000. Similar soundstage, details and timbre (both bottlenecked on the E3000 due to the mid-bass focus causing it to have bloated bass).
Overall, the E1000 with the micropore mod is actually better than the E3000. Not only does it sound better (for my library at least), it fits better (a bit longer and bigger body) but most importantly it is easier to drive. So if you wanted an E3000 but couldn’t because of lack of power (smartphone or PC for example) then the E1000 with the micropore mod is a great alternative that’s also cheaper.
Final Audio E1000: Rank up from C (in stock) to B+ (micropore mod)
I cant take credit for this mod though, as I saw it over here:
https://iems.audiodiscourse.com/?share=E1000,E1000 (Vent Mod)
Ironically,
@baskingshark just talked about the E3000 being hard to drive in the post above. Well, I found the solution to that. The E1000 with micropore tape mod.