Thank you so much for describing in detail what I also felt without being able to put it into proper words about the LBBS ("my end-game for low-fi earbud" etc.) and for comparing them to various earbuds!Having been 2 weeks of using K's LBBS, I'm totally satisfied. At last, I think I found my end-game for low-fi earbud (got them with 32$ through Shopee).
Sound impression (with 1 layer of thick full-foam): nicely detailed and balanced sound, bass is enough, treble is extended, mid is not forward or backward, sound-stage is so so.
-Compared to EA: LBBS is less in bass, sub-bass quantity but more detail and bigger 3D sound-stage, EA is kind of dark sound with a little bit muddy mid (only OK when using with 3-4 small holes full foam), off-treble and small sound-stage => overall, LBBS is much more enjoyable.
-Compared to RW-9: RW-9 shows wider sound-stage with bigger bass and real sub-bass, make better initial wow effect but LBBS win in detail, treble extension, precise instruments position and not-backward mid => overall LBBS is more balanced and more all-rounded. However, RW-9 is greater for asking price.
-Compared to my DIY PK1 Red-film 150ohm (with 7n copper cable, Oyaide plug): PK1 red-film has smoother performance, better in instruments sound and position, wider sound-stage but insufficient in bass quantity (however, very well response to EQ) and treble extension. Overall, PK1 Red-film is more relaxed, LBBS is more lively performance.
K's LBBS is definitely worth for an all-rounded earbud recommendation.
One thing I would like to say is that to increase the sub bass and bass of the LBBS you should try Double foams (Donut foam on full foam).
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