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So judging from this and the few other impressions of the SUI, it's both kind of treble happy sometimes and bass happy IIRC, and that's with the stock Comply tips. IME Comply tips used to reduce treble so is it correct to assume when the SUI is used with other kinds of tips, the treble would be more prominent?
Mind you though my mind is kind of blown due to something else.
They're bright, yes. Also bassy. U-shaped without recessed mids. Yet it still has a very analytic sort of sound to my ears, which is what makes them so intriguing. It's sort of that "refined, reference-quality fun" signature that the TH900 has, only a bit more extreme. I think it pulls this off because of all the engineering that went into it, resulting in a very refined sound. While the bass is powerful, it doesn't sound bloated and overwhelm the mids. The treble is indeed bright, but the construction of the housing helps to eliminate nasty resonances. There's some glare on a few tracks, but just when you think it might be too much it pulls back.
Keep in mind Ocharaku is a very, um, unconventional company. The SUI was basically engineered to use the Comply tips. I'd imagine if you used other sorts of tips it might bork the sound, though that's just speculation. I honestly haven't tried. Which is curious, because normally I dislike Comply. However it
works on the Flat4 quite well. My guess is using other tips would reduce the bass quantity and boost the treble slightly.
The overall FR balance isn't the strongest point of the Flat4 to me however. It's the inner-detail retrieval that just blows me away. Really, the only other IEM I've encountered that can top it in this regard is the Tzar 350, and ultimately
that ends up sacrificing listenability to achieve its effect IMHO. The Flat4 doesn't have a big soundstage, but it has a deep
headstage. It's extremely cerebral and meticulously conveys the relationships between sound-objects
within that space.