What I would imagine at least.
Seems pointless to me besides wanting to stand out and being able to use the “3D” marketing term…
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Anyone have experience with the Yu9 Audio U556 and U554? Really interested in them being similar to Ety but for a fraction of the price
“We see exactly what we should on the graphs:
- an almost flat response in the range from 20 to 1,000 Hz;
- a nearly ideal envelope IEF curve up to 6 kHz;
- a next to none peak at 15 kHz. This is quite what’s left of 8 kHz. Why not 17 kHz, as in the calculations above? This is because these are measurements on a simulator that has a maximum earpiece immersion depth limited by a metal mesh.
- take note of a subtle emphasis at 5 kHz. This is where the reference frequency has moved: F=340,000/(4*15)=5,6 kHz.
Interestingly, the frequency response abruptly stops at 16 kHz. That’s exactly what the manufacturer promises us as the specifications literally say: 20Hz-16kHz.
The U-556 sound is neutral, with a little bias for midrange frequencies. However, in broad terms, it’s deadly neutral. Everything is shared and shared alike in the earphones’ sound, all frequencies are heard equally well, and nothing is highlighted or veiled. This can be called ‘monitor sound’, and the earphones can be used for mixing – I can easily imagine this use case. This sound can be called ‘boring’ — yes, it’s not Harman, not at all. I tend to think practically: it was very interesting for me to listen to my music library for the 125th time and analyze how well the tracks I know sound with this sound delivery. And I can surely say that they sound great, all and sundry, even those that are poorly recorded / mixed because U-556 don’t accentuate the dangerous area of 4-6 kHz and don’t have an emphasized ‘top’ after 10 kHz and an inflated bass. I’d like to note that there are also no problems with the perception of subbass due to a very tight fit and excellent sound insulation. These earphones are surprisingly omnivorous in terms of musical content. As for the virtual sound stages, sense of space, and precision of instrument placement, U-556 will deliver this information in the same ‘neutral’ approach: if this stuff is present on the track, you’ll hear everything exactly as it should be. If not, too bad for you.
Here’s nonlinear distortion at 94 dB with the ‘Use harmonic frequency as ref’ option turned off and on. Everything fits into the range up to 1%. “
^^^ This is from internet 
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Noob question. Who is the manufacturer?
Campfire Audio
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More interesting is what the price will be compared to today’s pricing 
I bet $1,800. 
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Poor Grand Luna, you haven’t even been released yet and they’re spitting on you. Maybe because for $1400 you don’t have a metal shell like the Monarch MK4. I know of dozens of IEMs costing over $3000 that have a resin shell, and… so what? Or because FR doesn’t strictly follow the conservative views of the man who has tuned so many IEMs and none of them are particularly notable, except in this forum. They offered a poor accessory package, right? At least their $50 cables are the quality of a $500 Chinese cable, checked! Campfire had bad tuning, really, have you heard of this IEM or is it easier to spit blindly with FR in front of you? $1400 is a lot of money - yes, it’s a lot for any IEM on Earth and beyond, but look around at the prices of almost all other companies. Come on guys, you don’t have to spit on everything that you don’t like, that’s not typical of strong people, but of embittered old dudes…
I’m in shape 
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One word- why 
?
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Everyone that review this loves it. Masterful tuning.
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