KZ ZS10 Pro X Review — A wildly popular budget classic gets a mature update, taming its sharpest edges while keeping the fun factor cranked to eleven

KZ packed a head-rattling subwoofer into a $33 IEM, but did they finally fix the harsh treble that made the original ZS10 Pro a polarizing mess? After spending significant time with the Pro X, it’s clear that KZ has finally learned that "energetic" doesn't have to mean "ear-piercing."

What you're actually getting

The KZ ZS10 Pro X is essentially a refined, more mature version of the budget-king that dominated the market years ago. You’re getting a 1DD+4BA hybrid configuration that prioritizes pure, unadulterated fun over analytical precision. It’s a V-shaped sound signature that doesn't apologize for its existence, pushing the sub-bass to the front of the mix while pulling back on the upper-midrange spikes that made the original model so fatiguing.

When you put these in, the first thing you notice is the sheer scale of the low end. As Joe Lam aptly put it, "It sounds like there's a subwoofer in the room or inside your head just from these tiny little IEMs." It’s a visceral, slamming experience that makes electronic, hip-hop, and modern pop tracks feel alive. The instrument separation is surprisingly competent for the price point, allowing you to track individual elements even when the bass is doing the heavy lifting.

However, this isn't a professional reference tool. The mid-range is noticeably recessed, which means if you’re a fan of intimate, forward-leaning vocals, you’re going to find these a bit distant. It’s a trade-off for that massive soundstage and bass impact. While the build quality of the alloy faceplates feels premium, the rest of the package is undeniably cheap. You’re getting a barebones experience—no case, a lackluster cable, and the lingering, frustrating reality of KZ’s hit-or-miss quality control.

Sound — what reviewers actually heard

• Sub-bass: The star of the show. It’s deep, authoritative, and has a natural decay that avoids sounding muddy.
• Mid-range: Recessed and thin. Vocals can occasionally sound raspy or pushed back in the mix.
• Treble: Significantly smoother than the original. It’s energetic without the "ice pick" fatigue, though sensitive ears might still find it lively.

Where it actually wins

The ZS10 Pro X wins by being unapologetically entertaining. If you’re looking for a pair of IEMs to wear while commuting or gaming, the V-shaped tuning is a massive advantage. It adds a sense of excitement to everything you listen to, and the improved treble response means you can actually keep these in for a three-hour session without wanting to rip them out of your ears.

The physical design is also a win. The matte black alloy faceplate looks and feels like it belongs on a product twice the price. It’s a comfortable, low-profile fit that stays secure, making it a great daily driver for someone who wants a "set it and forget it" pair of monitors that don't look like cheap plastic toys. As Prime Audio Reviews noted, "Tuned primarily for fun, the KZ ZS10 Pro X is not afraid to let its hair down when it comes to the bass."

Where it falls short

The biggest hurdle here is the consistency. KZ has a reputation for quality control issues, and the ZS10 Pro X isn't immune. Channel imbalance is a real risk, and as ian fann pointed out, "I think this bad imbalance is a little bit too much for me to accept." If you get a bad pair, the soundstage collapses and the imaging becomes a mess. It’s a gamble you have to be willing to take at this price point.

Beyond the QC, the mid-range is a weak point. If you listen to vocal-heavy acoustic music or jazz, the ZS10 Pro X will likely disappoint you. The vocals sound thin and distant, lacking the body and warmth required to make a singer feel present in the room. Furthermore, the lack of a carrying case is a glaring omission. You’re getting a basic, tangle-prone cable and a set of tips, and that’s it. You’ll need to budget for a third-party case and potentially a better cable if you want to use these long-term.

Should you buy it?

Buy if you

• Prioritize sub-bass slam and an energetic, fun sound signature.
• Need a budget-friendly pair of IEMs for gaming or high-energy music genres.
• Want a comfortable, durable-feeling shell that looks better than standard plastic.

Skip if you

• Are a critical listener who demands a flat, neutral, or mid-forward frequency response.
• Listen primarily to vocal-centric music where mid-range presence is non-negotiable.
• Are worried about QC lottery and want a brand with more reliable manufacturing standards.

A highly entertaining, bass-heavy IEM that successfully refines the harshness of its legendary predecessor.

Sources consulted

• Prime Audio Reviews — KZ ZS10 Pro X Review
• ian fann — KZ ZS10 Pro X 1DD+4BA iem (Earphones) | Unboxing | Graph | First Impressions
• Rohitagni Mukherjee — The Best IEM from KZ under $50 - KZ ZS10 Pro X Review | The Upgraded Most Popular IEM under Rs 5000🎧
• Joe Lam — KZ ZS10 Pro X - Best IEMs for Under $55

Synthesis combines independent reviews above. Verdicts and quotes attributed to original creators. Affiliate disclosure: we may earn a commission from qualifying purchases via Amazon links.