If you want a planar magnetic powerhouse built for durability and extended listening sessions while watching TV, choose HIFIMAN SUNDARA Over-Ear Full-Size; if you need a lightweight, closed-back design with passive noise isolation and rotatable ear cups for immersive gaming or studio work, choose Linsoul Kiwi Ears x.
• HIFIMAN SUNDARA: Strengths include an ultra-thin diaphragm for wide frequency response (6 Hz to 75 kHz) and a rugged all-metal headband; trade-off is its open nature offering no passive noise cancellation. Best for audiophiles seeking detailed sound in quiet environments.
• Linsoul Kiwi Ears x: Strengths feature a fully closed-back design with memory foam pads for passive noise cancelling and a pivoting cup system for a universal fit; trade-off is a more limited frequency range (20Hz - 20kHz) compared to the Sundara. Best for gamers and commuters needing isolation.
• Who picks which? Choose the Sundara for pure fidelity and build quality; choose the Kiwi Ears x for comfort, isolation, and versatility across different head shapes.
The HIFIMAN SUNDARA is engineered for those who prioritize sonic detail above all else. Its defining characteristic is the newly developed diaphragm, which is 80% thinner than previous generations. This engineering choice directly translates to a frequency response that stretches from 6 Hz to 75 kHz, capturing nuances that other headphones simply cannot reach. If you are using these for TV watching, you will notice how fast and detailed the audio becomes, especially during complex scenes with rapid dialogue and subtle background effects. The "velvet glove over a marble fist" pairing with portable amplifiers like the SuperMini suggests this headphone is designed to reveal every layer of your source material without distortion.
Comfort plays a massive role here, but it is achieved through structural integrity rather than soft padding alone. The weight spreading strap distributes load across the top of your head, making long sessions feasible. The enclosure is constructed from metal, specifically designed to withstand the rigors of urban life. While the matte black finish offers a sleek, fashion-conscious look, the underlying construction is purely functional. However, users must understand that this is an open-back design. There is no noise control mechanism listed; it relies entirely on the seal provided by the rounded, contoured earpiece shape against your ears. This means it is not suitable for noisy rooms where you need to block out distractions.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-29 · 7 min read · Independent comparison
This product is ideal for the home listener, the studio engineer, or the dedicated music enthusiast who wants a reference-grade experience. It fits anyone who values a wider frequency response and faster transient response over isolation. If you frequently travel on planes, trains, or sit in busy coffee shops, the lack of passive noise cancellation makes this a poor choice. But if you have a quiet living room or a dedicated listening space where you can enjoy high-fidelity playback without interference, the Sundara delivers a level of clarity that feels almost unnatural. The inclusion of a new 3.5mm connector ensures durability, and the overall weight of 372 grams is substantial enough to feel premium, though slightly heavier than some competitors due to the metal components.
The Linsoul Kiwi Ears x Z Reviews: Serene project targets a completely different user base: the gamer, the commuter, and the mobile professional. At its core lies a custom-made 57.5mm planar magnetic driver enclosed in a meticulously tuned space. Unlike the Sundara, this unit is fully closed-back. This design choice creates a physical barrier that traps sound inside the earcups, resulting in exceptional passive noise cancelling. The combination of thick protein leather pads wrapped around memory foam and a custom refractory filter on the driver reduces unwanted reflections and external noise. For someone watching TV in a house with kids or a roommate, this isolation is critical. You get an undistorted soundstage without having to blast the volume to hear the details.
Comfort here is defined by adaptability. The headset weighs only 235 grams, significantly lighter than the Sundara, thanks to its aluminum frame and polymer cups. But the real game-changer is the 125° pivot on the ear cups. This rotatable feature allows the headphones to adjust to any head shape, ensuring a consistent clamp force that doesn't hurt over time. The spring steel headband can even be manually bent to modify the tightness, a feature rarely found in mass-market audio gear. The tuning by Z Reviews brings a bass-tilted tonal balance that is described as tight, accurate, and abundant. This makes it particularly engaging for gaming where footsteps and explosions need to hit hard, or for DJ work where low-end precision matters.
This headphone is perfect for those who need a versatile tool that works equally well in a quiet bedroom and a chaotic environment. The detachable cable with dual 3.5mm entry points allows for customization, letting users experiment with different cables to "tune" the final sound. The sensitivity of 102 dB means it is easy to drive, requiring less power from devices like phones or laptops compared to higher impedance models. While the frequency range is standard (20Hz to 20kHz), the speed of the planar driver ensures lightning-fast transients. If you value the ability to wear headphones for hours without fatigue and need to shut out the world, the Kiwi Ears x is the superior choice. It bridges the gap between high-fidelity audio performance and practical, everyday utility.
• Best for frequency range and detail → HIFIMAN SUNDARA Over-Ear Full-Size (6 Hz to 75 kHz vs 20Hz - 20kHz).
• Best for passive noise isolation → Linsoul Kiwi Ears x (Fully closed-back design vs Open-back).
• Best for lightweight comfort → Linsoul Kiwi Ears x (235 g vs 372 g).
• Best for durability and build quality → HIFIMAN SUNDARA Over-Ear Full-Size (All-metal headband vs Polymer/Aluminum mix).
• Best for adjustable fit → Linsoul Kiwi Ears x (125° rotatable ear cups and bendable headband vs fixed fit).
• Best for driving ease → Linsoul Kiwi Ears x (102 dB sensitivity vs 94 dB).
• Best for long-term listening in quiet rooms → HIFIMAN SUNDARA Over-Ear Full-Size.
• Best for multi-environment use (TV, Gaming, Commuting) → Linsoul Kiwi Ears x.
In my opinion, I would buy the Linsoul Kiwi Ears x for general daily use, including watching TV. While the HIFIMAN Sundara is a marvel of audio engineering with its incredible frequency response, the closed-back design of the Kiwi Ears x offers something far more practical for most modern lifestyles. The passive noise cancelling and the rotatable ear cups make it a true companion for TV watching, allowing me to immerse myself in the story without being disturbed by household noise. The lighter weight also means I can wear them longer without discomfort. Unless you are a purist who exclusively listens in a perfectly silent room, the versatility and isolation of the Kiwi Ears x make it the smarter, more usable choice for a primary headset.
The Linsoul Kiwi Ears x features passive noise cancelling due to its fully closed-back design and memory foam pads, making it excellent for blocking out ambient noise while watching TV. The HIFIMAN Sundara is open-back and does not offer noise isolation, so it is better suited for quiet rooms.
Both the HIFIMAN Sundara and the Linsoul Kiwi Ears x are wired headphones with no built-in battery, so neither requires charging. They rely entirely on the connected device for power.
Yes, the Linsoul Kiwi Ears x features 125° pivot on the cups, allowing them to rotate for a universal fit on any head shape, whereas the HIFIMAN Sundara has a fixed earcup design.
The HIFIMAN Sundara offers a much wider frequency response ranging from 6 Hz to 75 kHz, providing greater detail and extension compared to the standard 20Hz to 20kHz range of the Linsoul Kiwi Ears x.
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