FATfreq x Effect Audio: Quantum VS Fiio FX15

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

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FATfreq x Effect Audio: Quantum and Fiio FX15 are in-ear monitors. FATfreq x Effect Audio: Quantum costs $770 while Fiio FX15 costs $750. FATfreq x Effect Audio: Quantum is $20 more expensive. FATfreq x Effect Audio: Quantum holds a slight 0.1-point edge in reviewer scores (7 vs 6.8). FATfreq x Effect Audio: Quantum has significantly better bass with a 3.5-point edge, FATfreq x Effect Audio: Quantum has significantly better mids with a 1-point edge, Fiio FX15 has better treble with a 0.5-point edge, FATfreq x Effect Audio: Quantum has significantly better dynamics with a 4-point edge, FATfreq x Effect Audio: Quantum has significantly better details with a 2-point edge and FATfreq x Effect Audio: Quantum has better imaging with a 0.5-point edge.

Insights

Metric FATfreq x Effect Audio: Quantum Fiio FX15
Bass 7.5 4
Mids 5 4
Treble 5 5.5
Details 6 4
Soundstage 6.5 6.5
Imaging 5.5 5
Dynamics 9 5
Tonality 7 4.9
Technicalities 7.5 5.7

FATfreq x Effect Audio: Quantum Aggregated Review Score

Average Reviewer Scores

Shuwa-T
Audio Amigo
Kois Archive Jaytiss Jays Audio Head-Fi.org

Average Reviewer Score:

7

Cautiously Favorable

Fiio FX15 Aggregated Review Score

Average Reviewer Scores

Precogvision
Jaytiss Head-Fi.org
Z-Reviews Super* Review

Average Reviewer Score:

6.8

Cautiously Favorable

Reviews Comparison

FATfreq x Effect Audio: Quantum reviewed by Jaytiss

Jaytiss 7.8 Reviewer Score
B+ Tuning
B Tech
I don't want to like, but I love.

Jaytiss original ranking

Jaytiss Youtube Channel
Mids: C+ Treble: B Dynamics: S Soundstage: A-
YouTube video thumbnail

Fiio FX15 reviewed by Jaytiss

2025-08-09
Jaytiss 7.1 Reviewer Score
B Tuning
A- Tech
Unique tuning, but the switch would be better in the mids or bass.

Jaytiss original ranking

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

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FATfreq x Effect Audio: Quantum reviewed by Head-Fi.org

Head-Fi.org 7.5 * score rescaled + normalized
2 community members have rated the FATfreq x Effect Audio: Quantum at an average of 4.0/5 on Head-Fi. Overall sentiment: Very Positive.

URL to full Review

Head-Fi.org original ranking

Fiio FX15 reviewed by Head-Fi.org

Head-Fi.org 7 * score rescaled + normalized
4 community members have rated the FIIO FX15 at an average of 3.8/5 on Head-Fi. Overall sentiment: Strongly Favorable.

URL to full Review

Head-Fi.org original ranking

FATfreq x Effect Audio: Quantum (more reviews)

FATfreq x Effect Audio: Quantum reviewed by Kois Archive

Kois Archive 7.8 Reviewer Score
S- Tuning
S Tech
Rating: A+ | Value: ⭐ | Gaming: 🎮🎮🎮 | Comfort: 4 very technical. wide. well tuned planar grainy treble due to the air

Kois Archive original ranking

Kois Archive Youtube Channel

FATfreq x Effect Audio: Quantum reviewed by Jays Audio

Jays Audio 7 Reviewer Score
A- Tuning
S Tech
Bright and full sound, very detailed, sparkly, airy, tons of treble extenstion... but it gets fatiguing with the stock filters. Blue filter has the best balance but still doesn't scale too well. 300 mesh filter goes hard tho - check modded ranking at bottom.

Jays Audio original ranking

Jays Audio Youtube Channel

FATfreq x Effect Audio: Quantum reviewed by Audio Amigo

Audio Amigo 6 * score rescaled + normalized
An interesting sort of Science Project IEM. FatFreq tried to extract as much Sub-bass power and texture while making an airy, detailed planar that isn't fatiguing. They succeeded, and with the Super Stage NOAH modules, this is the most open and wide sounding single Planar I've ever heard. Wish it was cheaper and didn't come with the Ares S II cable.

Audio Amigo original ranking

Audio Amigo Youtube Channel
YouTube video thumbnail

FATfreq x Effect Audio: Quantum reviewed by Shuwa-T

Shuwa-T 5.7 Reviewer Score
B- Tuning
B- Tech
I struggle with this, perhaps it was insertion depth but that unconventional iem shape should never have been greenlit Average bass, thin midrange, unbearably sibilant treble

Shuwa-T original ranking

Shuwa-T Website

Bass: A Mids: C+ Treble: C- Soundstage: B Details: B Imaging: B-

Fiio FX15 (more reviews)

Fiio FX15 reviewed by Z-Reviews

Z-Reviews 8.5 * score rescaled + normalized
check links for more info:

Z-Reviews original ranking

Z-Reviews Youtube Channel
YouTube video thumbnail

Fiio FX15 reviewed by Super* Review

Super* Review 8* * score rescaled + normalized
check links for more info:

Super* Review original ranking

Super* Review Youtube Channel
YouTube video thumbnail

Fiio FX15 reviewed by Precogvision

Precogvision 3.6 Reviewer Score
D+ Tuning
C- Tech
Odd recessions in frequency response lead to unique imaging but uncanny tonality.

Precogvision original ranking

Precogvision Youtube Channel
Bass: C- Mids: D Treble: C- Dynamics: C- Details: C- Imaging: C+

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FATfreq x Effect Audio: Quantum User Review Score

Average User Scores

Average User Score: n/a

Based on 0 user reviews

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Fiio FX15 User Review Score

Average User Scores

Average User Score: n/a

Based on 0 user reviews

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FATfreq x Effect Audio: Quantum Gaming Score

Gaming Score & Grade

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

Gaming Score

6.8

Gaming Grade

B+

Fiio FX15 Gaming Score

Gaming Score & Grade

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

Gaming Score

4.9

Gaming Grade

C

FATfreq x Effect Audio: Quantum Scorings

Average Technical & Tuning Grades

Average Tunign Grade

A-
  • Tuning lands in a pleasing sweet spot with mostly coherent frequency integration. Tonality stays consistent from track to track.

Average Technical Grade

A
  • You get a controlled, composed performance, marrying decent clarity with a still-modest sense of space. A safe technical performer for the price bracket.
Bass A
Expect a commanding bass response that reaches deep without clouding the mix. There's both slam and nuance in equal measure.
Mids C+
The mids are solid and dependable, though not especially remarkable. Vocals stay reasonably grounded in the mix.
Treble C+
Highs come through with reasonable clarity while staying mostly smooth. Sibilance is mostly controlled.
Dynamics S
This is reference-grade dynamic performance with breathtaking realism. It mirrors live-music intensity perfectly.
Soundstage B+
A satisfying balance of width and depth yields a stage that feels organized and engaging. Imaging lines up with the intended mix.
Details B
Finer gestures snap into focus without sounding clinical or forced. Layering holds strong across genres.
Imaging B-
A stable phantom center appears, lending vocals a consistent anchor. It maintains a coherent phantom center.
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

Fiio FX15 Scorings

Average Technical & Tuning Grades

Average Tunign Grade

C
  • It struggles with balance, producing a lumpy response that rarely sounds coherent. Genre hopping highlights glaring inconsistencies.

Average Technical Grade

B-
  • It offers a competent showing, maintaining cohesion on straightforward arrangements. Complex passages start to challenge it, but never derail the show.
Bass C-
Low-end presence is gentle and restrained, favoring balance over slam. There's enough presence for casual listening.
Mids C-
The region is listenable but lacks the finesse and clarity of better tuning. A touch of EQ can smooth things out.
Treble B-
Treble feels agreeable overall, bringing sparkle without significant fatigue. You get a polite sense of air.
Dynamics C+
Dynamics feel competent, bringing energy without the finest detail. It carries energy without sounding aggressive.
Soundstage B+
You can map the ensemble with confidence thanks to solid spacing and coherent depth layering. Ambient effects feel believable.
Details C-
It conveys the core of each track yet glosses over the quieter gestures underneath. Delicate details remain a bit subdued.
Imaging C+
Stereo cues lock in more reliably, even if depth mapping remains approximate. Panning transitions smoothly across the stage.
Gaming C
Minimal environmental definition provides only general audio cues. Suitable for games where positioning isn't critical. Bad value-to-cost for gaming purpose - not recommended

FATfreq x Effect Audio: Quantum User Reviews

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Fiio FX15 User Reviews

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