In-Ear MonitorOverreview

TANGZU Wan'er S.G II Bass Version (Lion Edition)

TANGZU's best-selling IEM is a $23 accessory bundle with a sub-bass shelf bolted on — and the hobby can't agree whether that bass is just right, too much, or not really there.

55 sourcesUpdated
$23Typical US price

Score aggregates reviewer opinions across topics.

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TANGZU Wan'er S.G II Bass Version (Lion Edition)

The short version

What to know.

A $23 warm, mildly V-shaped single-dynamic-driver IEM whose 'Bass Version' retune is, on sixteen measurement rigs, a 3–5 dB sub-bass shelf on an otherwise unchanged Wan'er S.G II — a ~10 dB low end that sits 1–2 dB above Harman from 20 to 300 Hz, an early ear-gain peak at 2–2.5 kHz, and relaxed presence and treble above 3 kHz. Almost everyone agrees on three things: the accessory bundle (HE Sonic and Tang Sancai tips, a good red cable, a pouch) is the best in the class and carries the value verdict; the soundstage is average-to-intimate; and it images well enough for casual gaming. Almost everything else is argued. Bass splits three ways — most hear a satisfying, controlled lift; a measurement-minded few find the bottom octave fatiguing over long listens; and a vocal minority who bought it for the bass call it dry, flat and short on mid-bass texture, 'not the bassier Wan'er' the name implies. Treble splits three ways too — smooth and safe, versus dark and plasticky with no sparkle, versus shouty or hot for the sensitive — and the mids divide between clear, forward vocals and a fuzzy, honky, low-contrast presentation. Detail, dynamics and comfort are all contested, the last between a light, stable, disappearing fit and a shell some find bulky with a short, wide nozzle. Build is the real caveat: the review fleet measures well matched, but the largest owner sets carry a steady tail of units going quiet or dead on one side within weeks, alongside cable, ear-hook and mic failures. A superb starter package for the money, then, whose sound most rate 'fine' rather than special — buy it from somewhere with an easy return.

About this product

The Wan'er S.G II in its 'Bass Version (Lion Edition)' — the 'Red Lion': a $23 single 10 mm PET dynamic-driver IEM in a translucent ruby-red resin shell (20 Ω, 113.5 dB, 0.78 mm 2-pin) whose only tuning change from the base S.G II is a 3–5 dB sub-bass shelf, sold as 3.5 mm, 3.5 mm-with-mic ($24) and Type-C-with-mic ($25) cables, all bundled with HE Sonic and wide-bore Tang Sancai tips, a matte-red cable and a magnetic silicone pouch. In stock at TANGZU's own store, Linsoul and Shenzhen Audio; in India it has sold through three limited Headphone Zone drops. A distinct SKU from the base Wan'er S.G II, the Jade Dragon and Amethyst Dragon colourways, the 2023 Wan'er S.G and the Studio Edition.

TANGZU's Wan'er has been the default 'first IEM' recommendation since 2023, and the 2025 Wan'er S.G II kept the warm, vocal-first house sound. The Bass Version (Lion Edition) — everyone calls it the Red Lion — arrived in February 2026 as a community-feedback retune in a translucent ruby shell, and within months TANGZU was calling it its best-selling product: three limited drops at India's Headphone Zone each sold out in days, and it became the most-posted budget IEM of the year on r/iems and r/iemlndia.

It lands in the most crowded corner of the hobby — the $20–25 single dynamic driver, up against the 7Hz Zero:2, GK Kunten, Moondrop Chu II, Tanchjim Bunny and Truthear Gate — with an unusual pitch: two sets of ear tips that sell for almost the price of the earphone, a cable and a pouch, plus 'deeper, more authoritative bass'. What follows is a read of some 55 sources — sixteen measurement rigs, the pro and YouTube reviews, six Head-Fi write-ups, 150 Reddit threads and 1,600 verified-buyer reviews — on whether the sound lives up to the box.

A good fit for

  • First-IEM buyers and anyone upgrading from wireless earbuds who wants a warm, forgiving, easy-to-drive set with everything in the box
  • Vocal-led pop, hip-hop and Bollywood listening — clear, present voices over a sub-bass cushion
  • Buyers who want the Tang Sancai and HE Sonic tips anyway — the earphone is close to free
  • Casual and story-game players who want footsteps and effects without spending more
  • Long, relaxed sessions for listeners who prefer a restrained top end

Think twice if

  • You want a true basshead set or textured, slamming mid-bass — this is a sub-bass shelf on a dry driver
  • You are treble-sensitive and won't tip-roll or EQ — the 2 kHz lift and 8 kHz peak can read shouty
  • You want air, sparkle and resolution — treble-heads and detail chasers rate it 'fine' at best
  • You have small ears or struggle with wide, short nozzles — try before you commit
  • You can't return it easily — the one-side-dies and channel-imbalance tail is real, so buy from a seller with a painless warranty
  • You already own a base Wan'er S.G II, Zero:2 or Kunten — the tuning gain is mostly a few dB of sub-bass and a box of tips

The reviewer consensus

Agreement &
disagreement.

7 / 12topics divide opinion
2 Strong agreement2 Mostly agree7 Divided opinions1 Limited evidence

Common ground6

  • A warm, mildly V-shaped single dynamic driver: a ~10 dB sub-bass shelf, an early 2–2.5 kHz vocal lift and a relaxed top — sixteen measurement rigs agree within 1 dB.
  • The 'Bass Version' changes only the sub-bass: 3–5 dB more below 60 Hz than the base Wan'er S.G II, identical mids and treble.
  • The accessory bundle — HE Sonic and Tang Sancai tips, a well-behaved red cable, a magnetic pouch — is the best at the price and is what carries the value verdict.

Points of contention6

  • Bass, three ways: a satisfying, well-controlled lift (most) vs too much low end for long listens vs big-but-dry, flat and mid-bass-light — 'not the bassier Wan'er' — from listeners who bought it for the bass.
  • Treble, three ways: smooth and safe vs dark and plasticky with no sparkle vs shouty or hot for treble-sensitive ears.
  • Mids: clear, forward, balanced vocals vs a fuzzy, honky, low-contrast midrange with the vocals too close.

A closer listen.

12 topics · 7 divided
Left: criticalRight: positiveTighter lines: more agreementDashed: limited evidence

Tonality

Leans positiveMostly agree
Reviewer sentiment29 supporting sources
CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Sources mostly agree on the shape — a warm, mildly V- or U-shaped take on Harman with a lifted sub-bass, forward-ish vocals and a relaxed top — and most call it well-judged for the money. A quarter of the weight hears the same balance as thin, unnatural or slightly off: a scooped lower midrange under a pushed 2 kHz, which the sceptics read as 'colored' or 'honky' rather than warm.

“The Waner SG Red Lion Edition goes for a softened Harman-style tuning, with a bit more body through the mid-bass and lower mids, and a slightly more relaxed take on the upper mids and treble.”

Prime Audio

“The tuning is brilliant.”

Bad Guy Good Audio Reviews (via YouTube transcript)

“doesn't have the most natural tonality, and that really boils down to driver quality”

Tone Deaf Monk (via YouTube transcript)

Measured

Sixteen IEC-711 rigs agree to within 1 dB below 6 kHz: a ~10 dB sub-bass shelf 1.4–2.3 dB above Harman IE 2019 from 20 to 300 Hz, +9.4 dB at 2–2.5 kHz (on target) but 2.3–4.2 dB under it from 3 to 5 kHz, presence 5–6 dB under at 6–7 kHz, an 8 kHz peak on target and a 10 kHz trough. Warm and forward at 2 kHz, relaxed above it.

Link to this topic

The hardware

Specifications.

Checked

Design

Type
In-ear monitor
Drivers
1 × 10 mm dynamic (PET diaphragm)
Housing
medical-grade PET, translucent ruby-red shell

Electrical

Impedance
20 Ω
Frequency response
20 Hz – 20 kHz

Connection

Cable
Detachable, 1.2 m
Connector
0.78 mm 2-pin
Plugs supplied
3.5 mm

Manufacturer-published figures, not measurements · from linsoul.com.

Follow the evidence

Sources 55

1–6 of 55 sources

Read with context

Limitations & method.

As of

What to keep in mind 6

  1. This is a read of where opinion sits in September 2026, seven months after launch; the sub-$25 field turns over fast and TANGZU's own colourways (Jade Dragon, Amethyst Dragon) share the shell but not the bass shelf.

  2. The Wan'er name covers several sets — the 2023 S.G, the base S.G II, the Studio Edition and this Red Lion — and forum posters don't always say which they mean, so the broad Reddit sentiment figures, which lump them together, are treated as background rather than evidence.

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