Being part of the IEM scene – as a former manufacturer, retailer, B2B distributor, consultant, reviewer and, above all, as a user – has made me develop an unexpected kind of fatigue. I still love discovering new products and emerging brands, but somewhere along the way many IEMs began sounding as if they were solving the same equation. Measurements improved, targets converged, and technical performance kept climbing. Ironically, diversity became harder to find. That’s why I get genuinely excited whenever I encounter a product that doesn’t feel like another iteration, but like a personal idea. The Waldgeist is exactly that.
Note: The listening impressions are based on prototype samples. The acoustics represent the intended product, but the visual design does not. Rather than photographing unfinished shells, I illustrated this article entirely by hand.
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Deer Ear
Jürgen “Yogi” Lang founded Deer Ear 4 years ago. As a trained audiologist, his passion for music connected him to stage performing artists. Just like me, he is not a musician, but really enjoys listening to music. Unlike me, his expertise comes from designing and manufacturing IEMs rather than analyzing them. Twenty years in digital otoplastic production gave him an unusually deep understanding of acoustic geometry long before Deer Ear existed. Situated in Germany’s Allgäu, Bavaria, Deer Ear is actually a brand belonging to a larger hearing aid company with several stores. So Yogi didn’t kick off from scratch, but his approach to acoustic design is refreshingly unique.
My initial fears about “another guy doing what others do” quickly vanished. Yogi told me that he is not very interested in the competition and – prior to me sending him some of my favorite TOTL IEMs – never even listened to other high-end IEMs. For someone designing products above 2.000 €, that immediately made me skeptical. It also made me curious. (Spoiler: I wouldn’t waste my time on an article if I believed they weren’t.)
During our exchange, a few things left a positive impression on me. I had to end a two-hour phone call so I could pick up my daughter from kindergarten. That’s how easy it is to converse with a fellow nerd. I immediately realized that Yogi is up-to-date regarding driver technologies. He loves experimenting and improving, and shares many updates on developments on the official Instagram account. Honestly, I believe he hasn’t even hit full throttle yet, and while I am certain that I won’t be able to keep up, I already look forward to what the portfolio looks like in 2-3 years.
For a first impression, I specifically requested two demos.
DE4 Studio (4-way, 4xBA)
You know I love that flat, neutral studio sound! And I wish every company had such a reference product because it can quickly show where one agrees or not. Just when the sample shipped, Yogi also sent me his measurements. To be honest, I was a bit disappointed not to see similarities to a diffuse field target. But when I actually listened, I was surprised how well it actually translated. Remembering that he didn’t research competing products, I have to applaud the outcome.
It’s not challenging the Softears RS10 – or the RSV –, IMHO. But there are some similarities to the HEDDphone TWO’s tuning, which was also tuned entirely by ear, professionals included. Two tunings that never chased a target, yet both sound convincing on their own terms. It’s a reminder that measuring neutral was never a prerequisite for sounding correct – a point that matters more than I expected by the end of this piece.
Some things I noticed: The bass is very flat and paper-like in physicality. When you order your unique pair, you can request a low-end boost, though. The other thing is that hi-hats are very soft, to the point where a “tss” sound appears as a “fft”. Also, mids could do with more space between layers, and occasionally they can sound a hint nasally. Nothing too dramatic, but the competition is very tough, and I keep searching for that next-level transparency. I didn’t find it here.
Freelancer (3-way, 1DD+2BA)
However, the Freelancer measures incredibly well! It shows exceptional polish with regard to the graph as a V-shaped tuning. It was designed for everyday use for consumers. So in a way, the Freelancer is the opposite of the dry and flat presentation of the DE4 Studio. I have to say that it exaggerates a bit for my personal preference, but that is in no way a qualitative assessment.
The midrange by itself is pretty much reference-grade and has the tuning I’d like to see on a “Studio” IEM. But then both ends are dialled up two notches. The bass quality is absolutely incredible. It goes deep, has great reverb and bounce. The physicality and impact are truly impressive. Unfortunately, the upper end is also boosted. Together, the presentation is exaggerated for my preference. To my ears, the treble is fairly bright and almost shrill and could use more warmth to balance it. Yet this IEM shows Yogi’s ambition for technical performance.
Both the DE4 Studio and Freelancer are priced similarly around 1.000 €. I find that both IEMs show strength. Together, they cover a very wide use case from consumer to professional mixing. However, I don’t think either is “best-in-class,” and I hadn’t even considered an article at this point. But then Yogi sent another package…
Waldgeist
”Originally I never intended to release the Waldgeist. It was simply the sound I had spent one and a half years trying to build for myself.”
While the other models would also tell an interesting story, sometimes the most exciting audio products aren’t created for customers. They’re created because someone becomes obsessed with a sound that only exists in their own head. Yogi’s vision materialized in a 4-way, 1DD+5BA (including one dual-diaphragm balanced armature, which I suspect we’ll see in more designs over the next few years).
Originally, Waldgeist started as a CIEM design. However, for the universal shape, Deer Ear adds a mathematically calculated tunnel resonator to reduce the resonance in the ear canal. So the tuning of the universal and custom-fitted versions is much closer.
AFAIK, there is no packaging design (yet), and I am also not sure about the final accessories. I also didn’t ask Yogi to give me this information, because I think it simply doesn’t matter for this feature. I gladly skip this section altogether and get straight to the…
Detailed Listening Impressions
The best I can describe the forest spirit’s characteristic is technical-melodic. You can tell that there is a strong sense for polishing strengths while the music stays enjoyable. The timbre is surprisingly natural and believable across the frequency range. Yet its strong V-shaped tuning doesn’t sound similar to any IEM I have yet heard.
Bass
Especially the low-end stands out as unique to me. The bass is impactful and scales to the infrasonic range. Extension-wise, it reaches lower than anything I have owned; physically, it is among the most felt bass I have experienced in an IEM. The custom-fitted version even offers an optional bone-conducting upgrade. But even without it, the lows are powerful enough to make the head shake when the track provides notes below 40 Hz. Compared to the recently released Grand Oriveti Eminency, the bass is less noticeably shelved, so it appears and fades out smoother and feels more organic.
Bass notes hit very fast and feel very tight despite the sub-bass elevation. Its quality will quickly win over bass fans, though the IEM’s overall signature is not pulling focus on the lows per se.
Midrange
There is zero bleed from the bass into the midrange. The tonality is neither warm nor cold, which makes this IEM very unpicky in regard to material. Vocals are recessed, though I never felt like details were going amiss. In fact, I find its timbral accuracy especially well suited for Classical music and acoustic instruments. But I really don’t want to limit its compatibility – any instrument or voice sounded as expected to me. Separation is also good, and individual objects have sufficient space and air around them to allow details to come through. It’s not the single richest-sounding in regards to texture and mid-detail, but it’s very suitable for the tuning.
There is some additional energy from the upper mids, which gives the sound a good sense for speed and also some bite. Yet the sound isn’t fatiguing.
Treble
I find the lower treble stands out a little bit. Hi-hats and snares are prominent but intentional. They give the music a snappy character and enhance the sense of speed. S-sounds can be prominent but not to the point where they become sibilant. In general, with short-stemmed ear tips, I didn’t hear any peaks or dips at all – indicative of the CIEM. Instead, the treble extension stood out to me. The Waldgeist has an exceptional sense of air that sounds very natural.
The full-size experience
Yogi told me that he was going for a full-size headphone experience while designing the Waldgeist. And as far as IEMs can currently go without software, I think he got impressively close! For one, the achieved extension on both ends, infrasound and super high tones, sounds natural and effortless. Mids are tonally correct yet placed further back, so they naturally give the listener space. Indeed, this is a large, wide, and deep sound. Among my collection of IEMs, I consider the Deer Ear Waldgeist to have the largest soundstage overall.
The boosted and smooth treble especially helps to make the music sound “open” and not trapped in your ear canal. While I finalized my impressions, Mark from Miniklangwunder told me that he has a pair of Waldgeist CIEM and can’t even tell when he’s wearing them because they sound so open. The effect could well be even better with optimized driver placement in a custom-fitted version.
Comparisons
The Deer Ear Waldgeist makes the recently featured Kaiser Atelier Zencarb sound bass-light. The upper mids are similarly prominent, but the mids have overall more weight and warmth on the Zencarb. It’s especially more intimate and up-close. Listening to the same Metal tracks, Zencarb is still the IEM that makes me want to jump into the mosh pit, whereas Waldgeist puts me at a less dangerous distance. The biggest difference, though, is how Zencarb makes me want to increase the listening volume while Waldgeist makes me want to lower it. Both sound great across all genres, but I noticed I prefer listening to Classical on the Waldgeist, while my preference for the Zencarb is either mood-dependent (needing that emotional pull) or my ears longing for more comfort (considering this Waldgeist is a universal demo).
Compared to the Softears RS10, Waldgeist has more musicality. RS10 beats Waldgeist in dryness and ultra-microscopic details but can’t match the wide soundstage and expansion. As a “studio in my pocket”, RS10 is unmatched in midrange detail, but Waldgeist is the flagship that consumers will prefer.
The IEM in my collection that comes closest to Waldgeist is the discontinued Softears Turii. Both are very technical with a focus on musicality and a wide soundstage. The acoustic design couldn’t be any further apart, though. The Turii uses a single DD, and Waldgeist is a BA-heavy hybrid. While their tunings are very different, I feel like they are both aiming for the same result. I do rate the Turii as a little bit more accurate, but Waldgeist gives me a stronger visceral experience. Ultimately, it’s one of those cases where I can’t tell you which I personally prefer.
Compared to the two Grand Oriveti IEMs, Waldgeist is closer to the Eminency in tonality. The Deer Ear is easier to get into and sounds less technical, though no less impressive. Supremacy still has that unmatched natural easiness and inviting warmth, which makes any technical performance unnoticeable behind the presentation. Ironically, you’d expect to experience technical prowess stronger the more you spend, but in this case the order is reversed.
Verdict
Deer Ear is a fairly new brand, but I can sense that the potential is extraordinarily high. Though Yogi has not (yet) targeted the audiophile crowd, I expect Deer Ear to quickly grow into a reputable brand within our community. Perhaps the portfolio isn’t fully refined yet, but the Waldgeist is as polished as I’ve ever heard an IEM. It is a true flagship IEM, with unique tuning, excellent technicalities, and a musical touch to fall for.
And I’m not just saying that. I was skeptical enough to nearly skip writing this feature at all – and somewhere along the way I ordered a pair of CIEM Waldgeist for myself. That’s exactly why Deer Ear deserves this article.
