Letshuoer Mystic 8 VS ThieAudio Monarch MK4

Letshuoer Mystic 8 lands as a surprising all-BA flagship (~$1,000) from a brand better known for budget planars—complete with a metal storage puck, multiple tip sets, a microfiber cloth… and even a necklace and “cat” ring. Build is standout: compact titanium shells with a subtle feline motif (gem-like eye), small flush fit, and a semi-custom contour that sits very stable once sealed. The nozzle runs a bit long (~6.1 mm), so shorter tips help; that rear wing may bug some ears, but overall comfort and stability are excellent—even sleepable. The weak link is the thin, tangle-prone cable with an unremovable leather tag, though the simple plastic 2-pin connectors are refreshingly practical.

Tonally it’s a bright-leaning neutral: lean lower mids/upper bass, a sub-bass-focused lift (from ~80 Hz down), and a touch of upper-treble energy. Not a basshead set, yet notes carry surprising weight, giving metallic instruments satisfying body without turning dry. Staging and separation are clean, but imaging performance is only mid-pack at the price; the presentation favors macro contrast over micro-texture. A small mid-bass bump (≈ +3 dB around 80 Hz) sweetens the balance. Versus Moondrop S8, the S8 digs more micro detail and images better, but lacks the Mystic 8’s heft. Versus Seventh Acoustics Supernova, Supernova images best and sounds warmer with more mid-bass, though a bit drier. Net: a distinctive, well-built, comfortable set with a unique look and engaging contrast—4/5 stars, if a touch pricey.

Super* Review original ranking

ThieAudio Monarch MK4 comes in at $1,150 with a tribrid array—2 DD + 6 BA + 2 EST—a chunky stock cable with friction-fit swappable terminations, and a genuinely excellent, in-ear-operable “Rumble” bass switch. The new metal shells look tidy, but the fit is very large; on average ears it tends to sit a bit out of the concha and feel unstable (seal is doable, comfort is mediocre). Build details like the firm chin slider are nice, yet the cable bulk and loose termination retention detract from daily use.

Tonally, stock MK4 aims for a clean-neutral presentation with a meaty, sub-bass-focused lift, lively upper registers, and excellent extension. The flip side is a slightly dry / clinical character with a hint of treble hardness that can leave notes feeling a bit bodyless. Engaging Rumble mode thickens the curve from ~300 Hz down—more warmth and weight, bordering on “gigabass” territory—making the set fuller and more fun, though arguably too bassy for purists. Staging and imaging are solid, and resolution is high, but macro-dynamics land behind peers; compared side-by-side, sets like Dunu Glacier and 64 Audio U4S feel punchier, while Valhalla sounds warmer, smoother, and more effortlessly resolving.

Overall, MK4 is a technically capable tribrid with two distinct tunings on tap—clinical-clean stock and warmed-up Rumble—but it’s held back by fit size, cable quirks, and that slightly wooden bass texture. For listeners chasing a bright-leaning neutral with legit sub-bass reach (and who can accommodate a big shell), it’s a compelling try; in this lineup, though, it settles at a three-star recommendation next to more engaging or comfortable alternatives.

Super* Review original ranking

Letshuoer Mystic 8 comes out swinging as a vocal-centric, bright-leaning all-BA set with unusually natural tonality and refined technicalities. Female vocals are the headliner—sweet, airy, and “pure”—without the shrill edge or artificial sheen heard on sets like Brain Dance or Cantor, and fuller, more musical than the clinical Meteor. Stage feels open with strong separation, smooth yet extended treble, and resolution around a Prestige LTD tier. It scales beautifully at mid to mid-high volume (≈75–80 dB), where intimacy and micro-detail bloom.

The low end isn’t about slam, but it’s tight, fast, and well-layered, with a natural mid-bass/lower-mid body that keeps vocals grounded. For hip-hop/R&B/EDM, bass-heavier alternatives will punch harder; on energetic tracks (K-Pop/J-Pop/treble-hot rock) the Mystic 8 can get spicy above ~65 dB, though it remains less fatiguing than the mentioned rivals. Overall, it’s a clean, balanced, bright-tilted tuning that prioritizes air, articulation, and vocal nuance over brute force.

Versus Diva, Mystic 8 offers tamer 1–3 kHz energy, better volume scaling, more natural male vocals, and extra air/detail—while being far cheaper. It feels like a refined, slightly sparklier upgrade over the OG Oracle, and a smoother, airier take on the Mangird Tea vibe. Softears RSV still rules for powerful, forward vocal weight (especially male), but Mystic 8 is cleaner, more spacious, and sweeter for female artists. For all-rounding, Monarch Mk3 and Volür cover pop/hip-hop better; Prestige LTD is the fun V-shaped detour. Gripes? The accessories—cable and case—feel budget at a $1,000 price. Everything else signals an endgame contender for ballads, indie, and slower rock with some of the best female vocals this side of far pricier flagships.

Jays Audio original ranking

The Thieaudio Monarch MK IV presents two distinct tuning options, elevating its versatility. The balanced switch delivers a clean, smooth, and slightly airy presentation, offering a refined all-rounder sound that's very detailed, well-layered, and resolving – essentially a direct upgrade to predecessors like the Monarch MK3 and Top Pro, with slightly more treble detail and air. Conversely, the bass switch provides a significantly fuller, warmer low end with punchy, well-textured bass and a tamer upper midrange, addressing criticisms of thinness in earlier models and offering a specialized, engaging listen for bass-heavy genres.

Technically, the MK IV sits comfortably in the $1,000 tier, offering a slight bump in detail retrieval, refinement, and smoothness over the MK3 and MK2, comparable to the Dunu Glacier and Prestige LTD. While not a giant leap, the dual tuning options make it arguably a better all-rounder than single-tuning competitors; the balance switch excels with acoustic, classical, and cleaner genres, while the bass switch shines with rock, metal, R&B, and pop. Build quality is improved with an all-metal shell, though the flimsy cardboard case is a notable disappointment. Vocals are smooth, balanced, and enjoyable, though sets like the Monarch MK2, Mystic 8, RSV, or Arcanis offer more forwardness or unique character. Bass quality is excellent for most, though pure bass enthusiasts might prefer models like the Thieaudio Origin for its unique texture.

Ultimately, the Monarch MK IV is a highly compelling endgame option for the vast majority. It combines strong technical performance with exceptional versatility through its two excellent tunings, covering a wide genre spectrum effectively. While value-focused options like the Top Pro, Volare, or Mega5EST offer similar technicalities at lower prices, the MK IV's refinement, tuning flexibility, and slightly superior performance make it easy to recommend. It allows listeners to leave the hobby satisfied, provided they resonate with its sound – though chasing marginally better flagships involves steep diminishing returns. The king might be debatable, but the MK IV is undoubtedly a very solid $1,000 contender.

Jays Audio original ranking

Build and presentation hit above the price rumor: a dense, metallic shell with a sleek “cat” motif, excellent nozzle/fit, and a surprisingly handy case with a rubber lid that’s easy to pop open. The 8-BA array (Sonion + “NSBA” branded drivers) gives it pedigree, while the stock cable feels a bit chintzy despite a 4.4 mm termination and chin slider. Final pricing isn’t set (the placeholder listing is a meme), but the talk is roughly around $1,000, which frames expectations for the rest.

On tuning, Mystic 8 comes across reference-lean, very clean and clear, with extended upper-mids/treble and a lighter bass shelf. It’s a laid-back, chill listen with strong micro-detail, imaging, and stage, but the macrodynamics feel reserved and the bass lacks some rich, organic texture; hip-hop and slam-seekers may bounce. A small EQ bass lift (sub/mid-bass shelf) unlocks body and brings the set to life without breaking its neutral poise.

In context, it outclasses Cadenza 4 for naturalness and timbre, while Cadenza 12 (2024) offers richer bass but has an odd upper-mid quirk and a much higher tag. The FR echoes the Monarch Mk II; if Monarch felt light down low, Mystic 8 won’t fix that, though it crushes it on shell/build. Versus sets like Thieaudio Origin (bigger shell, weaker micro-detail), Canpur Verdandi (more bass/upper-mid bite), or DAA Mecha (fun but not neutral), Mystic 8 positions itself as a refined, mid-focused all-BA with standout technicals and an ownership appeal. As a ~$1k competitor, it’s compelling—just not the most visceral/engaging without that tasteful EQ nudge.

Jaytiss original ranking

Priced between $1,150 and $1,300 depending on custom faceplate options like the butterfly design shown, the Thieaudio Monarch MK IV boasts exceptional build quality with a large but well-contoured titanium shell offering a secure and comfortable fit. Key features include the innovative rumble switch for adjustable bass levels on the fly, a durable two-pin connector, and a solid feel that inspires confidence in longevity. While the included accessories are considered fair but unexciting, the shell's customization potential and rugged construction are major highlights.

Sonically, the Monarch MK IV delivers a detailed, exciting, and clean sound signature that stands as the best in the Monarch lineage. The rumble switch provides two distinct profiles: the red switch (no rumble) offers a balanced, tactful bass presentation, while the gold switch (rumble) adds a satisfying sub-bass shelf ideal for genres like hip-hop. Treble performance is notably improved over the MK III, though a 10k peak requires careful ear tip selection for some listeners. It trades blows with flagships like the $3,000 Annihilator (better sub-bass focus) and the $1,800 Elysian Apostle (more vocal forward), often matching or exceeding their technicalities while offering its unique tuning flexibility.

Scoring a top-tier 9.8, the Monarch MK IV earns its place through a compelling combination of premium build, the highly functional rumble switch, and outstanding sound quality that feels both special and refined. While acknowledging the high price, it represents significant value against competitors like the $2,000 Thieaudio Valhalla or the fiddly Grand Maestro, offering a feature-rich, durable, and sonically excellent package that justifies its position as a current summit-fi favorite.

Jaytiss original ranking

Eight balanced armatures (4 Sonion, 4 Knowles) and a lighter, more comfortable fit give the Letshuoer Mystic 8 a strong first impression. The frequency response shows sub-bass priority over mid-bass with a long, even midrange “porch,” creating space and clarity. Against the Cadenza 12, the Mystic 8 comes off less heavy yet more agreeable in tuning, making it one of Letshuoer’s better executions to date. Sticker price discussion aside, the assumption that the priciest model is the best gets challenged here.

On low end, this is not a basshead set yet it doesn’t feel bass-light: 808 drops hit cleanly, bass guitar texture pops, and kick drum carries satisfying punch—surprisingly fuller than the graph or the Cadenza 12 comparison suggests. The mids are the star: vocals sound natural and present without mid-bass bloat or shouty upper-mids, while treble harmonics stay controlled to avoid fatigue. Overall verdict: a solid “competes with peers” in the $1,000 arena, flirting with “I’d buy it” after proper listening time—proof that tuning and execution matter more than driver counts and flagship labels.

Bad Guy Good Audio original ranking

Monarch MK IV lands as a top-three set, sitting just behind the PMG APXSE and CP622B, and it earns that spot with an evolutionary design: a single, tactile rumble switch that can be flipped while the IEM is in-ear—no fiddly pins, no tools. In stock (red) mode it’s a vocal-friendly tuning with restrained mid-bass; engage the switch and the low end lifts, adding note weight without smearing the mids. The shell is metal, build is tight, and all the BAs are Sonion, signaling premium parts and execution.

Low-end performance nails both 808 drops and classic rock kick drums (“When the Levee Breaks”) with satisfying slam—better with the switch on—while bass guitar texture (pulls, plucks, string ring) stays articulate into the lower treble. Vocals are clean in stock mode and gain a pleasing husk and density with rumble engaged, making artists like Neil Young and Mark Knopfler pop. Upper mids/treble avoid glare and long-term fatigue, turning this into a true “sofa set” for hours-long sessions.

At $1,400 it competes shockingly well against far pricier summit-fi gear—no veil, no masking, just balanced resolution and a flip-to-taste bass shelf. Compared to Valhalla, the MK IV’s instant two-flavor flexibility pushes it ahead on value; bone-conduction curios like Origin feel more niche by contrast. Net: the best ThieAudio to date, an easy recommendation, and likely the new #3 overall—thanks to that simple, game-changing rumble switch that future proofs the tuning.

Bad Guy Good Audio original ranking

Letshuoer Mystic 8 leans hard into “flagship” theatrics: a cat-themed shell, a fancy case with a suction-seal lid, and even bonus jewelry in the box—plus a tray of 18 silicone tips. The metal shells are surprisingly light, the nozzle is long and secure, and fit feels pressure-free rather than stuffed into a tube. The cable looks premium but is very thin, fixed to a 4.4 mm plug with no swappable heads, and carries a leather “sound alive” strap that can’t be removed. Branding/marketing gets a little mystical (phantom cat, starlight, mist), but the build and accessories are undeniably luxe.

Sonically, this is the rare all-BA set that doesn’t sound like one. With an 8-BA array, 4-way tubes, a 3-way crossover, and a low-pass module, the presentation is effortless, tight, and strikingly natural from whisper to “send it.” Transients feel fast—notes appear, clean up, and reset before the next one hits—so the stage reads organized and pinpoint; imaging is “banjo at 1.4° right” levels of precise. Bass doesn’t mimic a big DD’s shove, but it’s taut and sufficient; treble is delicate and refined without splash; mids land neutrally and never shout. It’s also easy to drive and doesn’t need break-in—just plug in and go, then keep turning up without the tuning falling apart.

Source synergy leans toward clean, unflavored players (e.g., warmer DAPs like the Shanling M5 Ultra paired beautifully, while some studio DACs felt flatter). Against kilobuck staples like Monarch, Mystic 8 reads more “plain” in the best way—accurate, open-feeling, and non-insistent. Quibbles: that non-removable strap, the fixed 4.4 mm, and the thinness of the cable at this price. But the verdict is clear: once the music starts, this set shifts from fashion piece to genuinely special transducer—$1,000-worthy for listeners chasing speed, control, and a “disappears-in-the-ears” experience.

Z-Reviews original ranking

Letshuoer Mystic 8 arrives as an all-BA set (eight drivers per side) with a compact titanium-alloy build and the striking “Phantom Cat” faceplate. The accessories mirror Letshuoer’s DX1: a sturdy metal-bottom case, nine pairs of silicone tips, cleaning tools, and a non-modular 4.4 mm cable that’s thin, soft, and non-microphonic but a bit tangle-prone. The shells are smooth with no sharp edges, sit flush, and isolate well; comfort is frankly exceptional. As with many all-BA designs there can be some pressure build-up, so sensitive listeners may want to demo first. Tuning is neutral-bright: the BA bass is light on slam yet tight and sufficient to ground the presentation without bleeding into the mids.

The star here is the mid-range: vocals sound lifelike, instruments carry natural tone and convincing timbre, and note weight feels just right. Treble sits slightly above neutral with an upper-treble lift that adds air and openness without harshness or sibilance; cymbals come through crisp rather than metallic. Technicals are solid rather than showy—good resolution, imaging, and separation with an open stage—placed below peak “detail monsters” but still satisfying. Versus Studio 4, Mystic 8 brings more air, energy, and stronger separation; compared to Luna, it trades that warmer, fuller body for cleaner mids and more refined treble; up against the “Caner” 14-BA set, it cedes ultimate detail and bass impact but wins on natural tonality. Recommended for listeners who prioritize mid-range realism and a clear, lively top end; not ideal for bassheads, those highly sensitive to upper-treble lift, or anyone bothered by BA pressure. Final verdict: a confident 4/5 for its engaging neutrality and superb comfort.

Gizaudio Axel original ranking

The ThieAudio Monarch MK4 is a premium IEM that earns a spot in the S-tier for competitive gaming, offering a significant upgrade over its predecessor and A-tier competitors. It features a unique rumble mode switch that adds a satisfying low-end punch and weight without muddying the detailed, reference-grade tuning of the standard mode. While the CNC aluminum build feels exceptional, the design is a bit bulky and heavy, which can lead to some comfort issues during very long, multi-hour sessions.

For gaming, the technical performance is nothing short of phenomenal. The imaging is holographic and the depth perception is absolutely exceptional, providing a critical advantage in tactical shooters like VALORANT where tracking footsteps through walls becomes incredibly precise. The wide and deep soundstage pushes sounds off the player, creating an immersive experience. While rumble mode is preferred for titles like Call of Duty, the standard mode's clean and detailed signature shines in battle royales like Apex Legends, though the 2-4k range can make gunfire a bit shouty at higher volumes.

This is also an absolutely amazing set for music, delivering an elevated level of technicality and resolution. The standard mode offers a fast, clean, and neutral listen with great detail retrieval, while the rumble mode provides a weightier, more engaging bass profile for tracks that benefit from the extra warmth and punch. Ultimately, it's a very high-end IEM that delivers a top-tier experience for both competitive gaming and critical music listening.

Fresh Reviews original ranking

ThieAudio Monarch MK4 arrives with the usual hype and a clear step-up in presentation: a thick, high-quality premium cable with interchangeable terminations, plenty of tips and tools, and a handsome case. The shells move to an all-metal build with a resin faceplate and a bass switch, while the internals stack up to 2DD + 6BA + 2EST in a four-way crossover. It is a big set—more long than wide—so smaller ears should test fit first, but the overall finish and hardware feel decidedly upscale.

In quick listens, the normal mode is the sweet spot: clean, powerful and immediately great without obvious quirks. Flipping the switch to bass mode turns things thunderous—fun for a moment—yet can nudge vocals out of balance on bass-heavy tracks, making the standard setting the better choice for everyday use. Early take: a confident, polished evolution of the Monarch line that favors balance and refinement in normal mode, with optional low-end excess on tap for those chasing extra rumble.

Tim Tuned original ranking

The ThieAudio Monarch MK4 presents a well-extended, refined treble that measures cleanly and feels more polished than earlier iterations, though the overall tonality can read a touch thin. Against its sibling Valaha, the MK4 trades warmth for a clearer top end, keeping the presentation crisp without obvious harshness.

Between the pair, the MK4 takes the edge on technical performance—notably resolution—thanks to a bit more upper-treble energy and a more controlled bass shelf, while the Valaha offers extra mid-bass thump and a slightly warmer tilt. Net result: the Monarch MK4 remains a standout around $1,000, balancing precision and extension better than its stablemate.

Precogvision original ranking