ThieAudio Monarch MK4 VS Ziigaat Horizon

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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.

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Ziigaat Horizon arrives as a striking tri-brid in the ~$300 bracket (1DD + 2BA + 2 planar) with a tuning that brushes close to Kiwi Ears Astral yet comes across a touch thinner and more balanced. The low end focuses on sub-bass rumble that’s tight, clean, and richly tactile, while mids keep timbre accurate and treble stays controlled—never shouty or fatiguing—yielding a fun-yet-almost-reference presentation. Build and comfort impress: ergonomic shells with that aqua-to-silver fade can be worn for 8-hour sessions, and the package includes Ziigaat’s new two-pin cable with interchangeable terminations (3.5/4.4), a roomy faux-leather case, silicone sets plus foams; tip rolling (e.g., ASMR tips) pairs well.

In games, ambient clutter drops away and crucial cues get spotlighted with confident imaging, separation, and convincing verticality. Footsteps in Valorant are clear and positional, though the lightest taps can blur a bit under nearby low-end rumble or heavy gunfire; Apex performance is exceptional, just a hair behind Astral/Mangird Tea Pro when ultimates stack; Call of Duty delivers satisfying impact with disciplined decay, though micro-cues can soften during chaos. Net-net, Horizon is a great all-rounder with clean, technical bass and a natural balance that works across titles. On the WallHack list it gets A– overall (A– in Apex, B+ in CoD, Valorant just shy of top marks), primarily nudged down by occasional masking of the lightest cues during intense mixes.

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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.

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Ziigaat’s Horizon follows the current meta-inspired recipe—think Astral, Metas, Crescent—but pushes the focus upward: the treble is the most prominent piece here. It’s bright-leaning without turning harsh, giving a crisp, “OCD-like” sense of transient bite and pinpoint imaging. Low end and vocals sit a touch behind the highs, so the presentation feels clean and lively rather than thick; at mid-volume, the top end drizzles detail over the mix like raindrops—engaging and textured, not shouty.

On the technical side, Horizon pulls strong detail retrieval and resolution for the price—above sets like Supermix 4 and near EM10/Volare —yet it doesn’t scale massively because of that treble lift. The bass is snappy and controlled, with good separation, but lacks the slam and rumble seekers of impact will want. Pairing and playlist matter: avoid hot, highly produced pop/K-pop/J-pop or most hip-hop where the combo of elevated highs and lighter bass can feel edgy; it shines with slower pop, R&B, indie acoustics, ballads, and classical where the sparkle reads as “high-fidelity.” Warmer sources help a bit, and tip-rolling (stock black/clear, or bass-adding options like Final E/divinus) can balance things—just skip anything that pushes treble further.

Against close competitors, Astral hit harder down low and feel more V-shaped and contrasty; Crescent is warmer and smoother but not as clear or micro-detailed. Horizon is the cleanest and brightest of the trio, with the most refined treble focus and “tickly” transients. Verdict: a value-minded all-rounder for detail lovers who prefer clarity and air over bass authority—technical, tidy, and energetic at sensible volumes, provided the library isn’t a treble minefield.

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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.

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The Horizon aims for a neutral-natural tonality with a slightly lean lower midrange, delivering standout vocal transparency and crisp separation. Bass is mostly sub-bass focused—felt and supportive rather than boomy—giving notes a pleasing sense of density without smearing the mids. The trade-off is an elevated upper-treble that adds air and detail but can tilt gritty/sandy if the fit or tips aren’t dialed in.

Build and accessories are a mixed bag: a surprisingly nice carrying case and swappable termination, but a fussy cable and a resin shell that fits deep and may need shorter, grippier tips to shine. Once seated well, the Horizon’s imaging and instrument separation pop, making complex mixes feel organized and engaging.

Versus pricier hype pieces with similar FR, the Horizon feels like a “short king” take: not as refined up top as the best of them, yet more weighty and satisfying than some leaner peers. Compared to something like Volume S at a similar price, this set is clearer and more incisive (better separation), while Volume S is fuller and smoother with punchier bass presence. At $330, it’s the most compelling entry in its family so far—addictive for transparency and staging, with the caveat of treble sensitivity and fit quirks.

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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.

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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.

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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.

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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.