Sennheiser IE900 VS Nightjar Singularity

IEM Comparison: Expert & Community Scores Side-by-Side

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Sennheiser IE900 and Nightjar Singularity are 1DD in-ear monitors. Sennheiser IE900 costs $1,500 while Nightjar Singularity costs $1,300. Sennheiser IE900 is $200 more expensive. Both score 7.8 from reviewers. Sennheiser IE900 has better bass with a 0.8-point edge, Nightjar Singularity has significantly better mids with a 1.5-point edge, Nightjar Singularity has significantly better treble with a 1.3-point edge, Nightjar Singularity has significantly better dynamics with a 1.5-point edge, Sennheiser IE900 has better details with a 0.5-point edge and Nightjar Singularity has significantly better imaging with a 1.3-point edge.

Insights

Metric Sennheiser IE900 Nightjar Singularity
Bass 10 9.3
Mids 5.5 7
Treble 6 7.3
Details 7 6.5
Soundstage 7.5 7.9
Imaging 6 7.3
Dynamics 6.5 8
Tonality 6.5 8.1
Technicalities 6.6 7.4

Sennheiser IE900 Aggregated Review Score

Average Reviewer Scores

Crin
Jaytiss Precogvision
Audionotions Head-Fi.org
Super* Review

Average Reviewer Score:

7.8

Strongly Favorable

Nightjar Singularity Aggregated Review Score

Average Reviewer Scores

Smirk Audio Audionotions Nymz
Yifang
Z-Reviews

Average Reviewer Score:

7.9

Strongly Favorable

Reviews Comparison

Sennheiser IE900 reviewed by Audionotions

Audionotions 8.5 Reviewer Score
I usually don't like things that aren't all rounders but this might be the exception. Bass is incredible - best in class - great texture, fantastic physicality. Treble response is great too - pretty resolving. There is a noticeable recession in the upper mids, giving these a fairly U/V shaped sound signature - violins, for example, lack a bit of brightness/bite that I would hope for. But unlike other V-shaped IEMs, the mids aren't offensive. Incredibly fun to listen to. Probably the best single DD available. EQ highly recommended.

Audionotions original ranking

Website (Audionotions)

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Nightjar Singularity reviewed by Audionotions

Audionotions 7.5 Reviewer Score
I fully expected these to be an overwhelmingly bass heavy set but instead got something quite different. Singularity bass is boomy and somewhat pillowy, extending deep and with almost atmospheric levels of elevation - seriously, just look at that frequency response... Now, pillowy is something that I don't normally associate with quality bass and it goes without saying that this adjective used to describe bass also suggests a lack of impact but it does rumble and there is meat to the bass, just lacking that harder, crisper, leading edge to the attack. And this is bad right? Well, as I am finding out, not exactly. Rather than having bass be the star of the show, instead, the bass serves as a backdrop to mids and treble which take center stage. This quite possibly the most technically proficient single DD set I've heard and trades blows with the IE900, perhaps having an edge in attack and dynamics. Transients are razor sharp and notes are very well defined. Vocals and instruments stand out and apart in the mix in a way that you usually would expect only from sets with multiple BA drivers, let alone one single DD. Timbre is pretty good as well - there is a bit of brightness here but it never is sharp or jarring - it's not the most timbrally accurate I've heard but it also doesn't have anything that sticks out to me as offensive or off putting. Instead, it seems that brightness adds to the sense of technicalities. And this is all with a very significant bass backdrop that surprisingly doesn't bleed or introduce mud into the mix. My theory (and I'm definitely not an expert here) is that if the bass were to be too punchy or impactful here, it would overwhelm the entire sound signature. But that's just my theory. This is a basshead IEM for mids and treble lovers. That said, as great as this set is, I think IE900 still holds the crown of best single DD set because I'm just a sucker for tactile bass and nothing quite matches the physicality to be found on that Senny.

Audionotions original ranking

Website (Audionotions)

Sennheiser IE900 (more reviews)

Sennheiser IE900 reviewed by Super* Review

Super* Review 9* * score rescaled + normalized
check links for more info:

Super* Review original ranking

Super* Review Youtube Channel

Sennheiser IE900 reviewed by Jaytiss

Jaytiss 7.1 Reviewer Score
B Tuning
C+ Tech
I don't get it, not even a little.

Jaytiss original ranking

Jaytiss Youtube Channel
Mids: B Treble: C+ Dynamics: B Soundstage: A

Sennheiser IE900 reviewed by Precogvision

Precogvision 7 Reviewer Score
A- Tuning
B+ Tech
Excelllent bass - simply excellent. Midrange could use some work, as could the generally average imaging chops.

Precogvision original ranking

Precogvision Youtube Channel
Bass: S+ Mids: C+ Treble: A- Dynamics: A- Details: A- Imaging: B

Sennheiser IE900 reviewed by Crin

Crin 6.5 Reviewer Score
B Tuning
A+ Tech
YouTube video thumbnail
Well-resolving DD IEM with excellent treble control, though with somewhat weak mid-high harmonics.
Youtube Video Summary

Sennheiser’s IE900 delivers a sub-bass–focused tuning with tight control and real tactility, but its trademark upper-mid recession (≈2–5 kHz) keeps vocals and instruments a step back. A pronounced 9–10 kHz lift adds sparkle and air; depending on tolerance, that energy can read either engaging or a touch sharp/sibilant. Technical chops are strong for a single DD—resolution and microdetail are genuinely competitive.

The sticking point is tonal balance and value. While the IE900 is refined and punchy, that blunted midrange character contrasts with its bright treble, creating a love-it-or-leave-it “blue cheese” appeal. Against peers—and especially Sennheiser’s own IE600, which fixes the mids while preserving similar resolution—the IE900’s $1,300 price starts to look tough.

In short: choose the IE900 for its clean sub-bass slam, crisp transients, and airy top if that treble profile hits the spot. If the priority is natural mids and better value without giving up much technical ability, the IE600 feels like the smarter pick—and the real redemption of Sennheiser’s IEM line.

Crin original ranking

Crin Youtube Channel

Sennheiser IE900 reviewed by Head-Fi.org

Head-Fi.org 8.9 * score rescaled + normalized
10 community members have rated the Sennheiser IE900 at an average of 4.7/5 on Head-Fi. Overall sentiment: Exceptional.

URL to full Review

Head-Fi.org original ranking

Nightjar Singularity (more reviews)

Nightjar Singularity reviewed by Z-Reviews

Z-Reviews 9 * score rescaled + normalized
YouTube video thumbnail
Youtube Video Summary

Single 10 mm dynamic done right. Singularity hits with that coveted one-driver cohesion: a bright, energetic top end riding on subway-tunnel bass swell that feels physical without drowning the mix. Layers stack cleanly, imaging projects like a stereo in front while ambience wraps overhead, and even on modest amps the presentation stays delicate yet weighty. On better chains (think tube or high-end portables), the staging and microtexture climb further, pointing to a legitimately kilobuck-worthy tuning and execution.

Everything around the sound? Mixed. The shell is compact but a bit boxy, fit can be finicky until the right tips are found (Dunu S&S or foam-stuffed silicones help), and the accessory spread—big case, stickers, adapters to 4.4/3.5—is fine but unexciting. The stock cable is soft yet feels mismatched: hardware sized like it’s for an 8-wire, odd strain bits, and overall not $1.3k-luxury. With the IEM sitting at roughly $1,300 bundled to a $500+ “Vanguard 2-wire,” upsell options rocket pricing to absurd heights; there’s no “no-cable” variant, which is the real gripe.

Verdict: as an IEM, it’s a knockout—cohesive, exciting, and vividly dynamic to the point of becoming a daily carry. As a total package, it’s weighed down by cable bundling shenanigans and a so-so fit. With a 43 Ω load, cable influence should be minimal anyway, so the savvy move is to buy the cheapest cable option, swap in a comfortable $50 aftermarket, and enjoy one of the better-sounding single-DDs out there.

Z-Reviews original ranking

Z-Reviews Youtube Channel

Nightjar Singularity reviewed by Yifang

Yifang 8 Reviewer Score
S- Tuning
A+ Tech
check links for more info:

Yifang original ranking

Yifang Youtube Channel

Nightjar Singularity reviewed by Smirk Audio

Smirk Audio 7.7 Reviewer Score
A+ Tuning
A Tech
Rich bass with great overall tuning. Pleasant timbre. Resolution could be better. Treble could use more liveliness.

Smirk Audio original ranking

Smirk Audio Head-Fi Profile

Bass: S- Mids: A+ Treble: A Dynamics: A+ Details: A- Imaging: A

Nightjar Singularity reviewed by Nymz

Nymz 7.1 Reviewer Score
A Tuning
B+ Tech
One of the best basses ever inside a very small and comfortable shell. The rest of the tuning is still pristine but the technicalities are bottlenecked by the single DD.

Nymz original ranking

Nymz Website

Bass: S+ Mids: B Treble: A- Details: B Imaging: A-

Sennheiser IE900 User Review Score

Average User Scores

Average User Score: n/a

Based on 0 user reviews

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Nightjar Singularity User Review Score

Average User Scores

Average User Score: n/a

Based on 0 user reviews

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Sennheiser IE900 Gaming Score

Gaming Score & Grade

  • The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.

Gaming Score

5.5

Gaming Grade

B-

Nightjar Singularity Gaming Score

Gaming Score & Grade

  • The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.

Gaming Score

6.6

Gaming Grade

B+

Sennheiser IE900 Scorings

Average Technical & Tuning Grades

Average Tunign Grade

B+
  • Expect a friendly tonal balance that could use polish but remains inviting. Great for casual listening, less so for purists.

Average Technical Grade

B+
  • An honest, middle-of-the-road performance preserves structure without chasing micro-detail. It's respectable for everyday listening sessions.
Bass S+
Expect a flagship-caliber bass presentation that defines impact, texture, and depth. Power never compromises precision.
Mids B-
Expect a competent midrange that keeps vocals grounded and instruments clear. Tone is acceptable across multiple genres.
Treble B
Highs sound lively and extended while remaining controlled. Detail retrieval keeps shimmer intact.
Dynamics B+
The performance feels robust, with satisfying punch and natural transitions. Nuances are easy to follow.
Soundstage A
The stage stretches in every direction, carving out clear three-dimensional pockets for each player. Placement accuracy impresses from the start.
Details A-
Micro-details glide to the forefront effortlessly while timbre remains natural. Ambient cues are vivid and lifelike.
Imaging B
Good imaging with precise instrument placement and clear front/back localization. Positions snap into place convincingly.
Gaming B-
Moderate spatial presentation conveys general directionality. Suitable for casual play where precision isn't critical. Bad value-to-cost for gaming purpose - not recommended

Nightjar Singularity Scorings

Average Technical & Tuning Grades

Average Tunign Grade

A+
  • Tuning feels refined, blending frequencies with convincing realism and engagement. Transitions between registers feel effortless.

Average Technical Grade

A-
  • Technical chops are reliable, pairing tidy separation with a soundstage that stays conservative. Micro-detail is decent, though never spotlighted.
Bass S
You get a reference-grade low end that feels powerful, deep, and effortlessly clean. The low-end foundation sounds studio-grade.
Mids A-
Expect lifelike vocals and instruments with impressive nuance and realism. You can easily follow harmonies and backups.
Treble A-
Treble performance is excellent—airy, extended, and beautifully controlled. It reveals subtle studio ambiance.
Dynamics A+
It captures both explosive hits and delicate shifts with lifelike realism. Micro-dynamics shimmer through the mix.
Details B+
Nuance retrieval becomes reliable, highlighting expressive touches in every instrument. It rewards attentive listening.
Imaging A-
Spatial cues respond immediately, reflecting every movement in the mix. Spatial cues respond instantly to the mix.
Gaming B+
Respectable environmental presentation favors atmosphere over precision. Detects obvious directional cues while conveying game world ambiance. Bad value-to-cost for gaming purpose - not recommended

Sennheiser IE900 User Reviews

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Nightjar Singularity User Reviews

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