Letshuoer S15 VS Heartfield CU8

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

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Letshuoer S15 and Heartfield CU8 are in-ear monitors. Letshuoer S15 costs $329 while Heartfield CU8 costs $279. Letshuoer S15 is $50 more expensive. Letshuoer S15 holds a slight 0.3-point edge in reviewer scores (7.4 vs 7.1). Letshuoer S15 has significantly better mids with a 2.5-point edge, Letshuoer S15 has better treble with a 0.5-point edge, Heartfield CU8 has significantly better dynamics with a 1-point edge and Letshuoer S15 has better soundstage with a 0.8-point edge.

Insights

Metric Letshuoer S15 Heartfield CU8
Bass 6.5 7.1
Mids 7.5 5
Treble 6.5 6
Details 6.5 7.1
Soundstage 6.8 6
Imaging 7 7.1
Dynamics 6 7
Tonality 7 6.9
Technicalities 7.1 6.6
Take these comparisons with a grain of salt—we don't have enough Letshuoer S15 and Heartfield CU8 reviews saved yet to provide an unbiased result.

Letshuoer S15 Aggregated Review Score

Average Reviewer Scores

Shuwa-T Jays Audio
Jaytiss Head-Fi.org

Average Reviewer Score:

7.4

Generally Favorable

Heartfield CU8 Aggregated Review Score

Average Reviewer Scores

Jays Audio
Jaytiss Web Search
Head-Fi.org

Average Reviewer Score:

7.1

Generally Favorable

Reviews Comparison

Letshuoer S15 reviewed by Jaytiss

2025-07-16
Jaytiss 8 Reviewer Score
A- Tuning
A- Tech
Nice Clarity, good detail. I feel it should have got more love.

Jaytiss original ranking

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

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Price: $329

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Heartfield CU8 reviewed by Jaytiss

2025-07-10
Jaytiss 7 Reviewer Score
B Tuning
B Tech
It's fine, but is fine worth your purchase?

Jaytiss original ranking

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

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Price: $279

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Letshuoer S15 reviewed by Jays Audio

Jays Audio 6.5 Reviewer Score
A Tuning
A Tech
YouTube video thumbnail
Neutral and laid back tuning. Great layering and separation and resolution. Great treble extension and air without being too sharp and light like other planar iems. Bass is also not light and floaty, and doesn't feel like planar bass - not slamming, but tight and well-textured. Vocals are laid back, but not too pushed back although it's not the most extended and powerful, but works very-well as a neutral set. Nice and open staging, and is the direct upgrade to the Hexa and Sonus. Very good safe all-rounder.
Youtube Video Summary

Letshuoer S15 takes the planar recipe in a more natural, neutral direction, dialing back the upper-mids/treble glare that made earlier S12 variants feel “planar.” The result is a heavier note weight, smoother edges, and a timbre closer to a good dynamic driver—without the etched, floaty thinness common to many planars. Vocals sit forward with less Harman-style shout, bass carries satisfying sub-bass rumble with tight mid-bass separation thanks to planar speed, and overall fatigue is low. The trade-off is a presentation that’s more relaxed than hyped: treble sparkle and micro-detail aren’t spotlighted, and those craving sizzle may find it a touch polite.

Against its siblings, S15 is the cleanest, most neutral option—more open and balanced than the darker, ultra-chill S08, and more refined/grounded than older S12 iterations that pushed treble energy. The newer S12 2024 brings back liveliness and air while staying smoother than previous S12s, but S15 remains the pick for a reference-leaning planar with convincing timbre. It costs a bit more than S12 2024, yet what you’re paying for is timbre quality, note density, and a fatigue-free listen that still carries enough low-end punch. For listeners prioritizing naturalness over fireworks, S15 feels like the most mature expression of Letshuoer’s planar line.

Jays Audio original ranking

Jays Audio Youtube Channel

Heartfield CU8 reviewed by Jays Audio

2025-07-16
Jays Audio 6 Reviewer Score
A Tuning
A- Tech
Warmer Harman 2019 with less shouty vocals. Bassy all-rounder with decent tech. Build and plate design is very pretty... but price is a bit high and not that competitive - wait for sale unless you really dig the look.

Jays Audio original ranking

Jays Audio Youtube Channel

Letshuoer S15 reviewed by Head-Fi.org

Head-Fi.org 8.3 * score rescaled + normalized
21 community members have rated the LETSHUOER S15 at an average of 4.4/5 on Head-Fi. Overall sentiment: Excellent.

URL to full Review

Head-Fi.org original ranking

Heartfield CU8 reviewed by Head-Fi.org

Head-Fi.org 8.1 * score rescaled + normalized
3 community members have rated the HeartField CU8 at an average of 4.7/5 on Head-Fi. Overall sentiment: Exceptional.

URL to full Review

Head-Fi.org original ranking

Letshuoer S15 (more reviews)

Letshuoer S15 reviewed by Shuwa-T

Shuwa-T 6.6 Reviewer Score
B+ Tuning
B+ Tech
Warmer tuned planar with less emphasis on the lower treble; easier to listen to for longer periods Still plagued by planar timbre, overall clarity takes a hit from warmer signature, slight subbass rolloff to my ears

Shuwa-T original ranking

Shuwa-T Website

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

Heartfield CU8 (more reviews)

Heartfield CU8 reviewed by Web Search

2025-08-30
uses AI-Search to turn user, reddit and head-fi reviews into clear, concise summaries.
Web Search 7.1 Reviewer Score
A- Tuning
B+ Tech

The Heartfield CU8 delivers a neutral sound that closely follows the Harman target curve, providing a balanced and accurate listening experience suitable for both critical monitoring and musical enjoyment. Its bass response is tight and textured, with a slight mid-bass bump that adds a touch of warmth without bleeding into the mids, while the treble remains smooth and free of sibilance.

Build quality is a standout, featuring a hand-finished brass chamber that feels premium but contributes to a heavier design, which might affect fit for some users during extended wear. The included cable is thin relative to the IEM's weight, though the deep recessed 2-pin connectors ensure a secure connection.

Overall, the CU8 excels with a natural timbre and cohesive presentation, making it a strong choice for those seeking an analytical yet engaging signature across genres, though its weight and sparse accessories are minor drawbacks. The PUR vibration control system effectively enhances dynamics, allowing its four balanced armatures to perform with the impact of more complex driver setups.

Letshuoer S15 User Review Score

Average User Scores

Average User Score: n/a

Based on 0 user reviews

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Heartfield CU8 User Review Score

Average User Scores

Average User Score: n/a

Based on 0 user reviews

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Letshuoer S15 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+

Heartfield CU8 Gaming Score

Gaming Score & Grade

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

Gaming Score

6.7

Gaming Grade

B+

Letshuoer S15 Scorings

Average Technical & Tuning Grades

Average Tunign Grade

A-
  • A smooth, agreeable balance keeps the presentation engaging without obvious flaws. Only sensitive ears will nitpick the bumps.

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 B+
The bass brings healthy impact, complementing mixes without overpowering them. It keeps up with faster passages cleanly.
Mids A
It delivers an excellent midrange that feels vibrant and true to life. It balances clarity with natural smoothness.
Treble B+
Highs sound lively and extended while remaining controlled. Detail retrieval keeps shimmer intact.
Dynamics B
Dynamic expression is good, delivering solid impact and convincing contrast. Percussion lands with convincing weight.
Soundstage B+
Lateral spread stretches comfortably while front/back cues start to feel convincing. You can trace front-to-back movement.
Details B+
Good resolution with clear articulation of nuances that keeps complex passages intelligible. Micro-details pop without sounding forced.
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. Value-to-cost may not be optimal for gaming-focused users.

Heartfield CU8 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 C+
The mids are solid and dependable, though not especially remarkable. Vocals stay reasonably grounded in the mix.
Treble B
The top end is engaging and airy, yet never overbearing. Brass and strings feel energetic.
Dynamics A-
The system snaps into action with precision, highlighting every swell. Recordings feel energetic and alive.
Soundstage B
A satisfying balance of width and depth yields a stage that feels organized and engaging. Imaging lines up with the intended mix.
Gaming B+
Respectable environmental presentation favors atmosphere over precision. Detects obvious directional cues while conveying game world ambiance. Value-to-cost may not be optimal for gaming-focused users.

Letshuoer S15 User Reviews

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Heartfield CU8 User Reviews

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