The
Celest Relentless is a 6 BA + 1 DD hybrid.
In case you are wondering, the term "Relentless" does not refer to a certain brand starting with K that relentlessly pushes out IEMs weekly.
Jokes aside, the "Relentless" is actually a legend from the Chinese ancient tome of the Classic of Mountains and Seas:
https://en.wikipedia.org/wiki/Jingwei
In this story, a girl named Nüwa drowned while swimming in the East China sea. Thereafter, she was reborn into a spirit guardian bird called Jingwei.
This diety bird swore to not let her tragic fate befall anyone else, and everyday, she picked up twigs and rocks in her beak from a nearby mountain, in an attempt to deposit these into the sea. The bird was determined to fill up the sea, one stone at a time!
Concluding the story, the sea mocked her, saying that she will never succeed in a million years. Jingwei replied stoically that she will spend ten million years - even a hundred million years - to accomplish her dying wish of not letting anyone else perish in the same manner. Thus came about the Chinese idiom of Jīngwèi tián hǎi (精衛填海) - which translates to relentless resolve even in the face of hopeless odds.
In fact, this IEM's shells feature a beautiful sea wave motif, in addition to a golden bookmark of the Jingwei bird, tying in nicely with this touching folk story.
Anyway, Chinese history aside, from brief out-of-the-box impressions, the Relentless sports a V-shaped tuning, which is very fun with big bass and a resolving treble. Treble is very well extended with superb air, something different from some of the recent darker Celest house tunings.
In fact, the technical chops on the Relentless are quite something, with a huge soundstage and nice micro-detailing. There's some hint of BA timbre, but initial impressions are quite promising. Will do some burn-in and A/B comparisons against other hybrid benchmarks and report back.