Audiowords
Softears RSV

Softears RSV

The vocal IEM nobody argues about — and the technicalities everybody does.

RSV = "Reference Sound Five"; Softears also badges it RS5, and retailers list it as "RSV RS5". Not the 2025 RSV-MKII, which is a different aluminium-shelled, bass-boosted set — nor the RS10, Cerberus, Turii, Studio4 or Volume S.

OverreviewIn-Ear Monitor22 sourcesas of 2026-08-02

Softears arrived in the West in 2021 as the quiet sibling of Moondrop — same city, shared engineers and drivers, a wholly separate company — and the RSV was the set that made the introduction. Five balanced armatures, a three-way crossover, no dynamic driver anywhere, and a name that promises the least fashionable thing in audio: reference.

It landed at $729.99 into the most contested price bracket of its era, against the Moondrop S8 and the Thieaudio Monarch, and it has been a fixture of best-of lists ever since. What reviewers do with it is unusually consistent: they praise the voice and then spend the rest of the review arguing about everything else.

The overview

An all-balanced-armature monitor tuned warm of neutral, with a sub-bass-led low end and a midrange that sources agree on more strongly than almost anything else at the price — natural, forward, and never shouty. It isolates very well and runs off a phone. Opinion splits, sometimes sharply, on how much treble sparkle it has, how wide it stages, how much detail it resolves, whether it feels dynamic, and whether the large sealed shell is comfortable or claustrophobic. What it costs today depends heavily on where you buy it.

Where they agree

  • Vocals and midrange timbre are the reason to own it — the single strongest point of agreement across every source
  • It sounds unusually natural for an all-balanced-armature set; reviewers repeatedly note it doesn't have the usual BA edge
  • The low end is sub-bass-led and does not bleed into the mids — measurements from five rigs back this exactly
  • Isolation is above average, thanks to the sealed, unvented shell
  • Easy to drive straight from a phone or dongle, with no hiss
  • Build, finish and the stock cable are well above the resin-shell norm

Where they split

  • Treble reads as smooth and linear to some, as short on sparkle and air to others — a unanimous 10 kHz dip sits underneath both readings
  • Soundstage splits almost evenly between 'narrower than its peers' and 'above average in depth'
  • Resolution is called merely average for the price by most, genuinely impressive by a substantial minority
  • Dynamics: punchy and lively, or smoothed over and unengaging
  • Comfort divides on one design choice — the large, fully sealed shell either disappears in the ear or builds pressure
  • Value at the $730 list, where the sceptics say wait for a discount
  • How it sounds shifts measurably with the source you plug it into, despite a marketed 'flat impedance' design
The verdict, mappedEvery aspect on one axis — criticized to praised. Hover a point for its spread; click to jump.
CriticizedNeutralPraised

By aspect — in detail

Mids

Strong consensus · 14 src

The strongest agreement in the entire field: vocals and instrumental timbre are why people keep this set. A small minority hears it turn forward at high volume.

“The mids are the star.”

Faxepremium, IEMRanking

“absolutely nothing in the way of shape partial overtones, shouty vocals, hollow mids, or hot highs”

Marcus, Headfonics

“Very well-balanced tonality with surprisingly good timbre, though slightly lacking definition.”

Crinacle, IEM Ranking List
Measured

Ear gain peaks at +7.3 to +10.5 dB between 2.90 and 3.07 kHz across five independent rigs — a 170 Hz spread in placement — then slides 2.5–3.7 dB down to 4 kHz. Forward, but with the peak sitting where it reads as presence rather than shout.

Tonality

Strong consensus · 12 src

Warm of neutral with a sub-bass tilt and a vocal-forward midrange. Sources agree on the shape; several note the 'reference' name oversells how neutral it actually is.

“The RSV is in the ballpark of reference neutral, however I do find it on the warm and smooth side of that description.”

shotgunshane, Super Best Audio Friends

“Mid and vocal centric set, this is not reference tuning despite the name”

Shuwa-T, IEMRanking
Measured

Klaus Eulenbach's IEC 60318-4 rig puts the RSV within ±1.7 dB of his reference target from 120 Hz to 10 kHz; Crinacle files it as "Neutral with bass boost".

Isolation

Strong consensus · 7 src

Consistently rated above average. The sealed, unvented all-BA shell and the medium-deep fit block a lot — the same design choice that drives the comfort complaints.

“The RSV does pretty good with isolation, since it's not a vented design”

shotgunshane, Super Best Audio Friends

“the RSV does very well for isolation in general”

Marcus, Headfonics

Bass

Moderate · 13 src

Widely called remarkable for an all-BA set — sub-bass depth without mid-bass bloat. The dissent is about absolute slam: a minority finds it too light for the money.

“The tuning of the RSV compensates this and has great punch and rumble without bleeding into the midrange.”

Klaus Eulenbach

“The RSV has some of the meatiest bass I have ever heard from an all-BA set.”

darmanastartes, Head-Fi

“You can’t expect bass from this set.”

Argha, Head-Fi
Measured

Eleven traces from five rigs agree: +4.4 to +6.9 dB at 20 Hz, peaking +5.8 to +7.4 dB at 30 Hz, still +5.7 to +7.0 dB at 50 Hz, then back to level (+0.3 to +1.0 dB) by 200 Hz. Sub-bass depth with essentially no mid-bass lift.

⚠ vs. listeners — A minority hears "a clear mid bass bias"; no rig shows one — the shelf is gone by 200 Hz. The likelier reading is that BA bass this quick and this deep reads as punch. Separately, foam tips measure 3.3 dB lighter at 20 Hz than any silicone tip, so a foam user and a silicone user are not hearing the same low end.

Build

Moderate · 11 src

Resin shell, carbon-fibre-and-gold-flake faceplate and stock cable all draw praise well above the class norm. Gripes are small and specific: no chin slider, no modular plug, 2-pin sockets not fully recessed.

“Build quality is very good as well, as the earpieces are unibody including the nozzles.”

Berkhan, Headfonia

“The seam between the faceplate and the shell body is invisible to my eyes and fingers.”

darmanastartes, Head-Fi

Treble

Contested · 12 src

Sources split cleanly: one camp hears a smooth, linear, non-fatiguing top that extends fine; the other hears real sparkle missing. Both are describing one curve.

Measured

All eleven traces from five rigs are down at 10 kHz — between −1.5 and −6.3 dB relative to 500 Hz — with an 8 kHz peak still standing above it. The dip is unanimous, and it survives every one of seven tips tested on one rig.

⚠ vs. listeners — Above 10 kHz the rigs disagree by 7.5 dB at 15 kHz, so the "extends past 15 kHz" claim sits in the band no 711 coupler measures reliably — two of the reviewers say so themselves. The split is real but it is octave-by-octave: the 8 kHz energy is what the first camp hears, the 10 kHz hole is what the second camp misses.

Where it splits
smooth and linear — extends fine, never harsh55%

“The RSV’s treble is perfectly linear running through the impact and crash regions”

Precogvision, Headphones.com
too understated — short on sparkle and air45%

“I find the RSV’s treble too understated”

darmanastartes, Head-Fi

Soundstage

Contested · 10 src

The closest split in the record. Reviewers divide almost evenly between 'narrower than its peers' and 'above average, especially in depth' — nearly everyone agrees width is not the strength.

Where it splits
narrow — centre-focused, not expansive53%

“The RSV is not the most expansive sounding 5-driver monitor out there”

Marcus, Headfonics
above average — strong depth and height47%

“staging is slightly above average to my ears”

Precogvision, Headphones.com

Detail

Contested · 10 src

Sources split, leaning critical: roughly three in five say resolution is only average for the price, while a substantial minority calls it genuinely impressive.

Where it splits
only average for the money61%

“I just don’t find the RSV to be the most crisp - much less resolving for internal, true detail - IEM in its price bracket”

Precogvision, Headphones.com
impressive — punches above the bracket39%

“The RSV’s resolution is also very impressive as well as its transparency.”

Berkhan, Headfonia

Dynamics

Contested · 8 src

Sources split: most find it lively enough and single out the bass for punch, but a well-argued minority hears the whole presentation as smoothed over and unengaging.

Where it splits
punchy and lively, especially the low end61%

“very dynamic-sounding bass for an all-BA set”

darmanastartes, Head-Fi
smoothed over — short on intensity39%

“there is a lack of intensity and engagement factor to the RSV”

Precogvision, Headphones.com

Imaging

Contested · 8 src

Sources split: separation and centre placement draw praise, but several reviewers say it smears once the mix gets busy.

Where it splits
precise separation and stable placement60%

“excellent instrumental separation and above-average clarity”

Marcus, Headfonics
falls apart on complex passages40%

“Imaging and layering are generally fine until the RSV hits a more complex track”

Precogvision, Headphones.com

Comfort

Contested · 11 src

Sources split on one physical fact: the shell is large and completely sealed. Half report a near-custom fit they forget about; half report pressure build-up, or shells too big for smaller ears.

Measured

There is no vent anywhere in the design — the pressure reports are a predictable consequence of a fully sealed all-BA shell, and five separate sources raise them independently. The nozzle is also unusually wide and has no retaining lip, which limits which aftertips will fit.

Where it splits
near-custom fit, comfortable for hours56%

“I did not experience any issues with fit and comfort during my time with the RSV”

Precogvision, Headphones.com
too big, and the seal builds pressure44%

“The housings are large and become uncomfortable for me to wear for more than a few hours at a time.”

darmanastartes, Head-Fi

Value

Contested · 7 src

The sharpest split, and it tracks the price you actually pay. At the $730 list most reviews argue against, opinion divides two to one in its favour; the sceptics all say the same thing — buy it lower.

Where it splits
worth it — the bang-for-buck pick of the range66%

“The RSV offers the most value for your money in their lineup”

Berkhan, Headfonia
only at a discount34%

“At typical new pricing around the mid-$500s it’s tough to champion”

Jaytiss, IEMRanking

Best for

  • Vocal-first listeners — this is the aspect nobody argues about
  • Long, unfatiguing sessions, and anyone sensitive to treble glare
  • Commuting or stage use, where the sealed shell's isolation pays off
  • Phone and dongle users who don't want to carry an amp

Skip if

  • You want slam and physical bass impact — the depth is there, the punch is contested
  • You chase air and sparkle up top; the 10 kHz dip is real and no tip fixes it
  • You want a wide, out-of-head stage
  • You have smaller ears, or you're prone to pressure build-up from sealed designs
  • You're buying primarily for detail retrieval at this price

At a glance

↳Consensus
75 / 100weighted mean across 22 sources — an aggregate, not a single verdict
↳Type
IEM
↳Sources
22 · 5 classes
↳As of
2026-08-02
↳Owner rating
4.6/5 · 8small, self-selected sample — skews high

Where to buy

Sources22 reviews across 5 classes. Weight reflects expertise × independence; echoes collapsed.
  1. s1Softears RSV ReviewHeadfonics (Marcus)Editorial2021-07-09w0.95
  2. s2Softears RSV Review - Hard to Love, Harder to HateHeadphones.com (Precogvision)Critical2021-04-27w1.00
  3. s3Softears RSV ReviewHeadfonia (Berkhan)Editorial2021-05-20w0.85
  4. s4Softears RSV Review and ImpressionsSuper Best Audio Friends (shotgunshane)Community2021-05-16w0.90
  5. s5Softears RSV – Natural and only thatHead-Fi (Argha)Critical2024-03-06w0.85
  6. s6Exodia, ObliterateHead-Fi (KuroKitsu)Community2022-03-03w0.75
  7. s7A strong contender from a long bloodline of reference IEMs!Head-Fi (Animagus, Twister6)Editorial2021-09-09w0.90
  8. s8IndexHead-Fi (darmanastartes)Editorial2021-06-05w0.90
  9. s9Softears RSV Review: Lovely Midrange, Exceptional Vocals!!Head-Fi (gadgetgod)Owneraffiliate2022-10-16w0.70
  10. s10Head-Fi showcase reviewHead-Fi (KickAssChewGum)Ownerunknown2021-09-06w0.65
  11. s11Softears RSV: the sacred dance of the five planetsHead-Fi (HansBarbarossa)Ownerunknown2021-04-19w0.60
  12. s12Softears RSV MeasurementsKlaus EulenbachMeasurement2021-02-07w1.00
  13. s13A New Reference In Its ClassHead-Fi (HuoYuanJia)Owner2021-03-16w0.10
  14. s14Softears RSV — 13 expert reviews, normalized 7.8/10 (A Tier)IEMRankingEditorialaffiliate2026-06-06w0.90
  15. s15Softears RSV Review (8.7/10)Faxepremium, via IEMRankingEditorial2026-06-06w0.85
  16. s16crinacle's IEM Ranking List — Softears RSV, A tierIn-Ear Fidelity (Crinacle)Measurementw0.95
  17. s17Softears RSV — raw REW export (IEC-711 clone)precog.squig.linkMeasurementw1.00
  18. s18Softears RSV — raw REW export (IEC-711 clone)pw.squig.linkMeasurementw1.00
  19. s19Softears RSV, stock and through an inline IEMatch — raw REW exportsnymz.squig.linkMeasurementw1.00
  20. s20Softears RSV — seven-tip comparison, raw REW exportsiemworld.squig.linkMeasurementw1.00
  21. s21Softears RSV — raw REW export (IEC-711 clone)animagus.squig.linkMeasurementw1.00
  22. s22Softears IEMs ranked by Reddit sentimentRedditRecsCommunity2026-08-01w0.70

Limitations & method

Consensus-of-sources synthesis · as of 2026-08-02 · not a measurement verdict or ground truth.