Simgot Supermix 4 VS Fiio FD 15

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

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Simgot Supermix 4 and Fiio FD 15 are in-ear monitors. Simgot Supermix 4 costs $150 while Fiio FD 15 costs $150. Fiio FD 15 is $0 more expensive. Fiio FD 15 holds a slight 0.4-point edge in reviewer scores (6.9 vs 7.3). Simgot Supermix 4 carries a user score of 6. Simgot Supermix 4 has better treble with a 0.5-point edge, Simgot Supermix 4 has significantly better dynamics with a 1-point edge and Fiio FD 15 has significantly better soundstage with a 1-point edge.

Insights

Metric Simgot Supermix 4 Fiio FD 15
Bass 8 7.3
Mids 7 7
Treble 6.5 6
Soundstage 6 7
Dynamics 6 5
Tonality 6.7 6.3
Technicalities 7 6
Take these comparisons with a grain of salt—we don't have enough Fiio FD 15 reviews saved yet to provide an unbiased result.

Simgot Supermix 4 Aggregated Review Score

Average Reviewer Scores

Gizaudio Axel
Yifang Tim Tuned Fresh Reviews Web Search
Kois Archive Jays Audio Jaytiss
Audio Amigo Head-Fi.org

Average Reviewer Score:

6.9

Cautiously Favorable

Fiio FD 15 Aggregated Review Score

Average Reviewer Scores

Jaytiss

Average Reviewer Score:

7.3

Generally Favorable

Reviews Comparison

Simgot Supermix 4 reviewed by Jaytiss

Jaytiss 7 Reviewer Score
B Tuning
B Tech
If this works for you, it's a sonic treasure. My unit has issues.

Jaytiss original ranking

Jaytiss Youtube Channel
Mids: B Treble: B Dynamics: B Soundstage: B
YouTube video thumbnail

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Fiio FD 15 reviewed by Jaytiss

Jaytiss 7.3 Reviewer Score
B Tuning
B Tech
Balanced and even. Solid set that is mid focused.

Jaytiss original ranking

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

Simgot Supermix 4 (more reviews)

Simgot Supermix 4 reviewed by Audio Amigo

Audio Amigo 8 * score rescaled + normalized
A slightly more V-shaped version of the Truthear Nova. A bit more bass, a bit more treble. Not as vocal focused. Some of the best technical performance at $150. Good accessories. Shells are more compact than the Nova.

Audio Amigo original ranking

Audio Amigo Youtube Channel

Simgot Supermix 4 reviewed by Kois Archive

Kois Archive 7 Reviewer Score
A+ Tuning
A+ Tech
Rating: A- | Value: ⭐⭐ | Gaming: 🎮🎮 | Comfort: 10 great harman set treble could be smoother

Kois Archive original ranking

Kois Archive Youtube Channel

Simgot Supermix 4 reviewed by Jays Audio

Jays Audio 7 Reviewer Score
A Tuning
A+ Tech
Endgame Harman, one of the smoothest IEMs I've heard with Tangzu Sancai tips (regular). Some units might be hotter in the treble/pzt timbre

Jays Audio original ranking

Jays Audio Youtube Channel
YouTube video thumbnail

Simgot Supermix 4 reviewed by Yifang

Yifang 6.5 Reviewer Score
B+ Tuning
B+ Tech
check links for more info:

Yifang original ranking

Yifang Youtube Channel

Simgot Supermix 4 reviewed by Tim Tuned

Tim Tuned 6.5 Reviewer Score
B+ Tuning
A+ Tech
Harman with more treble energy Can be too spicy

Tim Tuned original ranking

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

Simgot Supermix 4 reviewed by Fresh Reviews

Fresh Reviews 6* * The score of this reviewer influences only the Gaming Score
check links for more info:

Fresh Reviews original ranking

Fresh Reviews Youtube Channel
YouTube video thumbnail

Simgot Supermix 4 reviewed by Gizaudio Axel

Gizaudio Axel 5.5 Reviewer Score
B Tuning
B+ Tech
Harman tuning. Soft bass, bright sound, metallic timbre.

Gizaudio Axel original ranking

Gizaudio Axel Youtube Channel

Simgot Supermix 4 reviewed by Head-Fi.org

Head-Fi.org 8.1 * score rescaled + normalized
50 community members have rated the Simgot Supermix 4 at an average of 4.3/5 on Head-Fi. Overall sentiment: Excellent.

URL to full Review

Head-Fi.org original ranking

Simgot Supermix 4 reviewed by Web Search

2025-07-08
uses AI-Search to turn user, reddit and head-fi reviews into clear, concise summaries.
Web Search 6.4 Reviewer Score
B+ Tuning
B Tech

The Simgot Supermix 4 packs a quadbrid driver configuration (1DD+1BA+1 Planar+1 PZT) into a comfortable resin shell. Its sound follows a U-shaped signature aligned with the Harman IE 2019 target, emphasizing sub-bass rumble and crisp upper-midrange clarity while keeping lower mids slightly recessed. The bass is deep and textured, though mid-bass punch can feel soft, and vocals sometimes edge into shoutiness at higher volumes.

Treble delivery is a standout, with the planar and PZT drivers offering snappy articulation and air without harsh sibilance. Technical performance is strong for the price, featuring a wide soundstage and precise imaging that excels in gaming scenarios. However, low impedance makes it source-sensitive, and accessories feel minimal with only one set of tips included.

While not class-leading in resolution, the Supermix 4 delivers cohesive tonality across its diverse drivers, making it a versatile choice for bass-forward genres and competitive gaming. Its slight warmth and holographic staging compensate for minor midrange thinning, offering solid value despite fierce competition.

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Simgot Supermix 4 User Review Score

Average User Scores

Average User Score:

Based on 1 user reviews

6

Mixed to Positive

Fiio FD 15 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!

Simgot Supermix 4 Gaming Score

Gaming Score & Grade

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

Gaming Score

7.1

Gaming Grade

A-

Fiio FD 15 Gaming Score

Gaming Score & Grade

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

Gaming Score

6.1

Gaming Grade

B

Simgot Supermix 4 Scorings

Average Technical & Tuning Grades

Average Tunign Grade

B+
  • It sounds pleasant overall, with some uneven spots that hint at room for refinement. Vocals remain pleasant despite the imperfections.

Average Technical Grade

A-
  • It manages detail and layering well enough, even if the stage feels only moderately sized. You get a clear sense of left and right, if not depth.
Bass A+
You hear powerful yet disciplined low-end slam that extends effortlessly. It marries sub-bass depth with great texture.
Mids A-
Expect lifelike vocals and instruments with impressive nuance and realism. You can easily follow harmonies and backups.
Treble B+
The top end is engaging and airy, yet never overbearing. Brass and strings feel energetic.
Dynamics B
You get confident dynamics that track both macro swings and rhythmic drive. There's life in every crescendo.
Soundstage B
Lateral spread stretches comfortably while front/back cues start to feel convincing. You can trace front-to-back movement.
Gaming A-
Good fundamental spatial awareness for most gaming scenarios. Handles basic positioning well but may lack nuance in complex situations.

Fiio FD 15 Scorings

Average Technical & Tuning Grades

Average Tunign Grade

B
  • A mostly enjoyable signature keeps things listenable despite a handful of quirks. It handles most playlists without major complaints.

Average Technical Grade

B
  • An honest, middle-of-the-road performance preserves structure without chasing micro-detail. It's respectable for everyday listening sessions.
Mids A-
Midrange performance is excellent, with natural timbre and great detail. Vocals feel lifelike and full-bodied.
Treble B
Treble is articulate and clean, adding excitement without harshness. It adds sparkle without harshness.
Dynamics C+
Dynamic performance is decent, delivering respectable macro swings with limited nuance. There's a fair amount of macrodynamic swing.
Soundstage A-
Excellent spatial presentation that is wide, deep, and tall with precise instrument placement. Width, depth, and height all feel expanded.
Gaming B
Decent spatial awareness for fundamental positioning. Creates satisfying atmosphere in story-driven games while handling basic directional cues.

Simgot Supermix 4 User Reviews

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Makavelian
6

Better tuned options at this price range.

Pros
Responsiveness to EQ
Cons
Typical harman IEM tuning - thin bodied and honky sounding.

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Fiio FD 15 User Reviews

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