Chu is eastern profile tuning, meanwhile Lea is western profile tuning. I’ve posted
a review on Amazon walking though Chu , Lea, 7Hz Salnotes Zero and here is an quote from that:
Tripowin Lea ($20) VS Moondrop Chu ($20):
It’s hard to pull whether Chu or Lea is better, Chu’s note is thinner, Lea is thicker. But Chu’s cable is not swappable, while Lea left a choice for users. I’d pick Lea over Chu for rock/billboard hit chats, and Chu for J-pop/classical over Lea.
Moondrop Chu($20) vs 7Hz Salnotes Zero ($19)
Both are tuned to neutral and natural approach, Chu has slightly thinner and impactful basa, a tad more energetic thus averted from pure natural, which bring Chu slightly detail oriented all-rounder, especially great for J-Pop/K-Pop. 7Hz Zero is pure natural, it serves a perfect studio in-ear monitor /reference. Great for all music genre, and 95% of people would find Zero to be their best sounding IEM ever tried. This is my honest opinion from my 20 years of experience in audio world. 7Hz Salnotes Zero is Sennheiser’s HD600/HD560S in an IEM form.
7Hz Salnotes Zero ($19) vs Tripowin Lea($20)
7Hz Zero has more natural and neutral note touch, which suites perfectly for all-genre but especially great for strings / jazz ensemble. Lea on the other hand would perfectly fit Rock/Pops, male vocals where you find in need for lower range of mid range and higher bass floor and warmer/richer note touch
Then now, Kiwi came out single LCP with nicely made shell for $35, Cadenza, and TinHifi came out with single LCP, C2 for $29. New challengers here.