Sennheiser IE900 VS QDC Gemini

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

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Sennheiser IE900 and QDC Gemini are in-ear monitors. Sennheiser IE900 costs $1,500 while QDC Gemini costs $2,100. QDC Gemini is $600 more expensive. Sennheiser IE900 holds a clear 0.8-point edge in reviewer scores (7.8 vs 7). Sennheiser IE900 has significantly better bass with a 3-point edge, QDC Gemini has significantly better mids with a 2.5-point edge and QDC Gemini has significantly better treble with a 2-point edge.

Insights

Metric Sennheiser IE900 QDC Gemini
Bass 10 7
Mids 5.5 8
Treble 6 8
Details 7 7
Soundstage 7.5 7
Imaging 6 7
Dynamics 6.5 7
Tonality 6.5 7
Technicalities 6.6 9
Take these comparisons with a grain of salt—we don't have enough QDC Gemini reviews saved yet to provide an unbiased result.

Sennheiser IE900 Aggregated Review Score

Average Reviewer Scores

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

Average Reviewer Score:

7.8

Strongly Favorable

QDC Gemini Aggregated Review Score

Average Reviewer Scores

Tim Tuned

Average Reviewer Score:

7

Generally Favorable

Reviews Comparison

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

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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)

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

QDC Gemini (more reviews)

QDC Gemini reviewed by Tim Tuned

Tim Tuned 7 Reviewer Score
A- Tuning
S Tech
A more natural feeling VX

Tim Tuned original ranking

Tim Tuned Youtube Channel
Bass: A- Mids: A+ Treble: A+

Sennheiser IE900 User Review Score

Average User Scores

Average User Score: n/a

Based on 0 user reviews

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QDC Gemini User Review Score

Average User Scores

Average User Score: n/a

Based on 0 user reviews

No user reviews yet. Be the first one who writes a review!

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-

QDC Gemini Gaming Score

Gaming Score & Grade

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

Gaming Score

6.9

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

QDC Gemini Scorings

Average Technical & Tuning Grades

Average Tunign Grade

A-
  • The tonal character feels settled and versatile, with just a few gentle bumps. You can listen for hours without fatigue.

Average Technical Grade

S
  • The technical ceiling is high here, revealing fine gradations without breaking composure. Every instrument carves out its own pocket in the mix.
Bass A-
The bass hits with conviction, offering both punch and clarity. It reaches low with confidence and control.
Mids A+
You get reference-worthy mids that combine transparency, texture, and depth. It brings out emotional nuance beautifully.
Treble A+
The treble performance feels luxurious, marrying air, control, and excitement. You can place every high-frequency element.
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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QDC Gemini User Reviews

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