In this article, I review the KZ ZA12 IEMs (in-ear monitors). The ZA12 is a hybrid hexa-driver IEM with 2 dynamic drivers and 4 balanced armatures. There are 2 models available: the Standard Version without tuning switches and the Tuning Version with tuning switches. I’m reviewing the Tuning Version (without mic) which is priced at 63 USD.

Disclaimer: This sample was provided by KeepHiFi for an honest review. All observations and opinions here are my own, based on my experience with the product.

KZ ZA12

Specifications

Drivers: 2DD+4BA drivers
Frequency response: 20-40000HZ
Impedance: 45Ω
Sensitivity: 103dB

Design

The KZ ZA12 IEMs come with a sleek, modern design. The faceplates have a subtle yet eye-catching metallic sheen, with angular cuts that give the earpieces a futuristic aesthetic. This contrasts nicely with the translucent resin shells, allowing you to catch a glimpse of the inner workings and driver configuration.

They fit snugly in the ear, maintaining a low-profile look, which makes them comfortable for extended use. It’s a design that feels durable without being heavy, balancing practicality with a touch of flair.

ZA12 comes with the standard KZ silver-plated copper cable with shrouded 2-pin sockets. It’s a bit stiff and has some memory but it’s robust and durable.

Sound

Gear used for testing includes the Shanling UP4, FiiO KA17 and iBasso DX180. ZA12 requires some decent power to shine so you should use a reasonably high-output source to get the best performance.

Bass

The KZ ZA12 delivers a tight, articulate low end that prioritizes precision over brute force. Basslines feel clean and controlled, with a subtle warmth that adds organic richness without bleeding into the mids. Sub-bass rolls off gently, lacking the visceral rumble for earth-shaking EDM or cinematic tracks, but this restraint keeps acoustic genres and rock grooves free of bloat.

Where the ZA12’s bass excels is its mid-bass punch—notes carry a satisfying weight and rounded body, giving kick drums a textured thud and bass guitars a soulful growl. It’s a Goldilocks balance: enough heft to feel engaging, enough discipline to avoid fatigue. Perfect for listeners who want rhythm sections to groove, not overwhelm.

Midrange

The KZ ZA12’s smooth vocals glide without any graininess, while instruments like acoustic guitars and pianos carry a natural timbre that defies its budget price tag. There’s no metallic sheen or artificial edge—just a lush, organic presentation that feels honest. Vocals sit slightly back but avoid shoutiness, maintaining a relaxed yet engaging presence.

Clarity shines here, with spacious separation that lets layered arrangements (think folk harmonies or jazz quartets) breathe effortlessly. Even in busy tracks, strings and voices retain their distinct textures without crowding. The tuning sidesteps nasal or honky pitfalls, opting instead for a refined neutrality that’s easy on the ears. It’s a midrange that simply performs—no drama, just fidelity.

Treble

The KZ SA12’s treble is crisp and airy, delivering impressive detail without harshness or grain. Cymbals and hi-hats shimmer with natural texture, and the extended high frequencies add a sense of openness to the soundstage, making genres like jazz or acoustic music feel vibrant and immersive.

While the treble leans slightly forward, it avoids sibilance and maintains smoothness. This sparkle will appeal to fans of clarity and air, though those sensitive to brighter signatures might find it intense over time. For most listeners, though, the SA12’s treble is a well-executed highlight—dynamic enough to excite without sacrificing polish and without any of the scratchiness of the older KZ models (like the original ZS10).

Soundstage & Technicalities

The KZ SA12 delivers a well-rounded technical performance, starting with its reasonably spacious soundstage. While not the widest in its class, it avoids feeling cramped, offering enough depth and air to create decent layering. Instruments and vocals occupy distinct spaces, giving tracks a cohesive yet separated feel.

Detail retrieval is a standout here: subtle nuances in recordings come through cleanly. Paired with strong instrument separation and solid resolution, the SA12 handles busy tracks without muddling elements. Imaging is decent, though not holographic—it pinpoints directions accurately but lacks some three-dimensional precision. For its price, however, the SA12’s technical chops offer good immersion and clarity.

Comparisons

Truthear Zero: Red

The ZA12’s bass is leaner than its siblings—think “diet cola” compared to KZ’s usual “double espresso.” It’s tight and textured but lacks that chest-thump, making it great for acoustic/indie fans who hate bloated lows.

The Zero: Red, though? Even tuned to Harman-neutral, its dual drivers deliver deeper, fuller bass (without bleeding). It’s like a subwoofer with manners: impactful when the track demands it, but never rude.

KZ ZS10 Pro 2

The ZS10 Pro 2 is like the energetic, detail-oriented sibling. It’s got that hybrid driver setup (1DD + 4BA) that delivers crisp highs and a punchy bass, making it great for genres like EDM or pop where you want that extra sparkle and thump. The soundstage feels wider, and it’s got a more V-shaped signature—so if you’re into lively, fun tuning, this one’s a winner.

On the other hand, the ZA12 is more of a balanced performer. It focuses on clarity and cohesion. The bass is still present but less aggressive, and the mids feel more natural and forward. It’s a better pick if you’re into vocals and acoustic and you’re not averse to some forward treble.

Verdict

The KZ ZA12 is a compelling option in the $50 arena. It has a lively, detailed sound signature with standout mids and energetic treble. While its sub-bass lacks the visceral rumble of bass-focused rivals and minor driver flex might annoy fussier users, these flaws feel forgivable given its strengths. If you prioritize clarity and sparkle over earth-shaking lows, the ZA12 is an easy recommendation—a well-rounded package that balances fun and finesse without breaking the bank.