If you want a modular, multi-driver IEM with adjustable tuning boards to sculpt your own sound signature for studio work or critical listening, choose KZ AS24; if you need a single, massive planar driver with wide stage clarity and a balanced cable included for low-latency monitoring on small ears, choose BASN ASONE PRO 14.2mm.
• KZ AS24: Strengths lie in its incredible flexibility with dual tuning boards and eight levels of frequency adjustment across four bands; the trade-off is that it is a wired-only solution requiring an external source and lacks native Bluetooth unless you add a dongle. This pick is for the audiophile tinkerer who wants to dial in a specific sound profile for every genre.
• BASN ASONE PRO 14.2mm: Strengths center on its powerful 14.2mm planar magnetic driver delivering a wide soundstage and immediate detail without complex tuning; the trade-off is a fixed sound signature that cannot be altered via software or hardware switches. This pick is for musicians and gamers needing instant, high-fidelity monitoring with excellent isolation.
• The Verdict: The KZ AS24 wins for customization seekers, while the BASN ASONE PRO takes the crown for those prioritizing raw driver performance and ease of use.
The KZ AS24 is built for the person who treats audio not just as consumption, but as a craft. With twelve pure moving iron units arranged specifically for high, mid, and low frequencies, this in-ear monitor is designed to offer a superbly detailed soundstage. The real magic here is the engineering behind the tuning. You get two tuning boards, one in each ear, which allow you to control ultra-high, high, medium, and low frequencies independently. That gives you eight distinct levels of adjustment. If you are a musician, producer, or someone who listens to everything from classical symphonies to heavy metal, this ability to tweak the treble or boost the bass without changing cables is a game-changer.
However, this level of complexity comes with a specific set of requirements. Because the AS24 relies on a detachable 0.75mm/2Pin connection and a standard 3.5mm stereo plug, it is strictly a wired device. It does not have built-in Bluetooth. To use these for wireless gaming or commuting, you would need to purchase a separate Bluetooth adapter or cable. Furthermore, the impedance ranges from 20 ohms to 50 ohms depending on whether you are using the standard or tuning version, meaning some mobile phones might struggle to drive them to their full potential without a dedicated amplifier or DAC. The shell is made using DLP 3D printing technology, resulting in a smooth, rounded design that feels precise, but the internal architecture is dense with components.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-28 · 7 min read · Independent comparison
This product is ideal for the studio engineer who needs to hear exactly what is in the mix, or the enthusiast who enjoys swapping out cables to change the tonal balance. It is less suitable for someone who wants to throw earbuds in a pocket and run immediately. If you value the ability to physically adjust the crossover points and frequency response to match your hearing preferences or the acoustic environment, the AS24 offers a depth of control that few other products in this class can match. But if you hate fiddling with settings or carrying extra adapters, this might feel like over-engineering.
The BASN ASONE PRO targets a different demographic entirely: the listener who wants massive soundstage and detail straight out of the box. At its heart sits a single 14.2mm planar magnetic driver. Planar drivers are known for their speed and precision, often providing a wider soundstage than dynamic drivers of similar size. This means you will experience studio-grade audio clarity with powerful bass that doesn't muddy the mids. The inclusion of both 3.5mm and 4.4mm balanced plugs in the box is a significant plus, ensuring you can connect directly to professional audio equipment, smartphones, or portable DACs without needing adapters that might degrade the signal.
Durability and comfort are also central to the ASONE PRO's design. The housing is lightweight and ergonomic, crafted to fit securely without causing fatigue during long sessions. Whether you are mixing tracks for hours or wearing them during a live performance, the design aims to prevent ear pain. The package includes memory foam tips alongside silicone ones, which is crucial for achieving the noise isolation required for professional monitoring. The cable itself is made of single crystal copper, a material chosen to maximize signal purity and reduce resistance, further enhancing the clarity of the audio transmission.
This model is perfect for the gamer looking for low latency in a wired setup, or the musician who needs reliable, consistent sound reproduction on stage. Unlike the KZ, there are no tuning boards to mess with. You plug it in, and you get a clean, wide, and detailed presentation. The trade-off is that you cannot change the sound signature. If the planar tuning isn't your preference, you are stuck with it. However, for many users, the "set it and forget it" nature of a high-quality planar driver is preferable to the constant tweaking required by hybrid multi-driver systems. It is a tool for professionals who need reliability and a flat, accurate response rather than a customizable toy.
• Best for Customization → KZ AS24: If you love adjusting EQ curves and want to tune the treble, mids, and bass independently, the dual tuning boards give you total control.
• Best for Raw Driver Performance → BASN ASONE PRO 14.2mm: The 14.2mm planar magnetic driver delivers a faster transient response and wider soundstage than the twelve moving iron units of the KZ.
• Best for Balanced Connectivity → BASN ASONE PRO 14.2mm: It ships with both 3.5mm and 4.4mm balanced plugs, offering better compatibility with pro gear right out of the box.
• Best for Sound Isolation → Tie: Both offer sound isolation, but the BASN includes memory foam tips which often provide a superior seal for smaller ears.
• Best for Wireless Adaptability → KZ AS24: While both are wired, the 2Pin connector on the AS24 makes it easier to swap in third-party Bluetooth modules compared to the MMCX connector on the BASN.
• Best for Comfort on Small Ears → BASN ASONE PRO 14.2mm: The lightweight planar design and included memory foam options make it a more natural fit for those with smaller ear canals who need low latency.
• Best for Studio Mixing → BASN ASONE PRO 14.2mm: The wide soundstage and planar speed offer a more accurate representation of the mix for professional monitoring.
• Best for Audiophile Tinkering → KZ AS24: The ability to shift frequency bands allows for unique personalization that fits specific hearing profiles.
In my opinion, for most people searching for low latency bluetooth earbuds for small ears or bluetooth gaming headphones for small ears, the BASN ASONE PRO 14.2mm is the stronger choice, primarily because of its planar driver's inherent speed and the inclusion of memory foam tips which secure a fit in smaller anatomy better than standard shells. The 14.2mm driver provides a clarity and width that feels more immersive for gaming and music alike, and having the balanced 4.4mm cable included removes the guesswork for anyone connecting to a decent source. However, if you are a gear head who refuses to accept a stock sound and demands the ability to surgically adjust your frequency response, the KZ AS24 remains a fascinating tool. But for a direct, high-performance experience that respects the limits of small ears, the BASN wins.
Both models feature ergonomic designs, but the BASN ASONE PRO 14.2mm includes memory foam ear tips which conform better to irregular ear canal shapes, making it particularly effective for users with smaller ears seeking a secure seal.
Since both are wired in-ear monitors, they offer zero latency when connected directly to a PC or console. The BASN ASONE PRO 14.2mm is particularly noted for its planar driver speed, which translates to crisp audio cues in fast-paced games.
The KZ AS24 has a higher impedance range (up to 50 ohms) and may benefit from a dedicated amp or DAC for optimal volume and dynamics, whereas the BASN ASONE PRO (16 ohms) is generally easier to drive with standard mobile devices or laptop outputs.
The KZ AS24 comes with a standard OFC cable with a 3.5mm jack, while the BASN ASONE PRO 14.2mm includes a single crystal copper cable with both 3.5mm and 4.4mm balanced plugs, offering superior signal purity for balanced inputs.
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