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Not to sound condescending but learn to read IEM response graphs and understand how they respond to output impedance. Due to how IEMs engage our inner ears, their graphs aren't 1:1 when compared to a typical headphone. That's a big caveat people always forget about when comparing charts. An "ugly" IEM chart looks quite different than one for headphones. They're also much harder to measure so their graphs should be taken with a larger grain of salt due to how they fit with most couplers. IEMs are incredibly fit dependent so if you don't have a proper seal, you will never get close to how they were engineered to sound. Insertion depth also plays a large part into aspects such as bass and impact, sound stage and treble extension. This is where CIEMs come into play and show superiority as you will get a perfect, consistent fit every time since they are molded to your ear canals. This will be the closest match to true IEM measurements since it's specific to your ear molds and they adjust them to fit their designated target response.
IEMs also tend to have very different 2nd and 3rd order distortion characteristics. You also tend to not need to worry about CDSs with IEMs but it can come in handy to understand if a set has any "ringing" issues.
In regards to impedance, depending on if it's a balanced armature and its crossover design, a hybrid system with crossovers, planar, or dynamic driver, the source can drastically change the sound and presentation. For example, the Campfire Andromeda is notorious for this. They are incredibly sensitive so unless your source is well under 1 ohm, you'll get some hiss. They also change drastically under a low OI (brighter, more resolving) or a higher OI around 3 ohms (warmer, more bass). Go too high and they start to sound odd and introduce odd harmonics and distortions.
I even forgot to bring up tip rolling which can have a significant impact on catering the sound to your liking (silicone vs foam). When it comes to cables, I have had very few instances in where this actually mattered. The one time it caught my attention was with the Andromeda. I went with a pure copper cable or its SPC Litz cable due to its impedance changes. This allowed me to use the Andro on less sensitive sources without hiss and added the right amount of warmth I wanted from them. This isn't common but is something that should be kept in mind as you try to nail down the sound you're looking for from your IEMs.
And honestly, for $200, you have a wealth of great sets to sample. Nowadays, this is the primo range for most and technology has really pushed what an entry level IEM can sound like. IEMs have so much more variation than headphones so it can be a bit daunting finding something you love but when you do, its much easier moving forward to know what speaks to you. Personally, I would go for comfort first and sound second. Even if their sound quality isn't summit-fi, having a comfortable, smooth, well-rounded IEM will benefit you more than something polarizing and niche that just reviews well. At least as you get started to find your preference.
Heefty
1387
Oct 4, 2018
jaydunndidditUnfortunately, I know what my preferences are, and can't find them. You are correct about the response curves. I can definitely pick out what a full sized headphone will sound like, or at least reasonably close, using its response curve, but haven't been able to piece it together for IEMs.
You do make a good point on customs being tuned for your ears. Starting with your ear shape and adjusting based on that to get to the target response has merit for sure. Maybe I really will have to break my rule and get some customs. I just need to find some with published response curves so I can try to figure out which ones I want.
HeeftyThat's fair. I only meant preferences in regards to IEMs as I prefer a different signature for them compared to headphones due to how they interact with different parts of ear. Just thought it was a caveat worth pursuing for you.
As far as budget CIEMs go, Custom Art gets mentioned a lot and people have a lot of good things to say about them: https://thecustomart.com/fibae-1/. There are a few others too should you want to do some more research and inquire further: Alclair Reference, Alclair Dual, UE 4 Pro, Cleartune CTM-200, and 1964 Audio A2e.
If you'd like recommendations for universals just let me know.
Heefty
1387
Oct 4, 2018
jaydunndidditI've been considering 64 A3 for a while. I might finally do it.
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