Audio-Technica ATH-AC5TW VS OnePlus Buds 4

The most fundamental design difference between these two earbuds is their fit philosophy. The Audio-Technica ATH-AC5TW uses an open-ear form factor, meaning it rests on the outer ear rather than sealing the ear canal. This preserves ambient sound awareness — a real-world advantage for outdoor use or situations where staying alert matters — but it comes at the cost of passive noise isolation. The OnePlus Buds 4, by contrast, adopts a traditional in-ear design that physically seals the canal, delivering better passive isolation and generally a more stable, secure fit during movement. The ATH-AC5TW includes wingtips to compensate for the inherently less-secure open-ear hold, while the OnePlus Buds 4 relies on its in-ear seal alone for retention.

Weight is another significant gap: the ATH-AC5TW weighs 21 g per earbud versus just 9.46 g for the OnePlus Buds 4. That is more than double the mass, and over extended listening sessions an open-ear bud sitting on the ear at that weight can create noticeable fatigue or pressure points — something the lighter OnePlus pair largely avoids. On durability, the OnePlus Buds 4 holds a clear edge with an IP55 rating, offering protection against both dust ingress and low-pressure water jets. The ATH-AC5TW's IPX4 rating covers only sweat and light splashes, with no rated dust resistance — a meaningful limitation in outdoor or gym environments.

Both products are fully wireless with no neckband, no RGB lighting, no display, and stereo speaker configurations, so those aspects are evenly matched. Overall, the OnePlus Buds 4 holds a clear design advantage: it is significantly lighter, better protected against the elements, and its in-ear fit offers superior passive isolation. The ATH-AC5TW's open-ear approach serves a specific use case — situational awareness — but the weight penalty and lower IP rating make it the more niche choice from a pure design standpoint.

Noise isolation tells a revealing story here. The OnePlus Buds 4 brings both active noise cancellation (ANC) and passive noise reduction to the table — a meaningful one-two punch that actively suppresses external sound via microphone-driven processing while the in-ear seal physically blocks ambient noise. The ATH-AC5TW has neither, which is consistent with its open-ear design but leaves it at a substantial disadvantage for commuting, office, or any noisy environment where immersive listening matters.

On driver size, the ATH-AC5TW's 14.3 mm driver is notably larger than the OnePlus Buds 4's 11 mm unit. A larger driver can move more air and often contributes to fuller low-end response — but driver size alone does not determine sound quality, and the frequency range data complicates this narrative considerably. The OnePlus Buds 4 reaches from 15 Hz to 40,000 Hz, while the ATH-AC5TW covers the standard 20 Hz to 20,000 Hz range. The OnePlus extension down to 15 Hz digs slightly deeper into sub-bass territory, and its upper ceiling of 40 kHz ventures well into high-resolution audio range — relevant if the source content supports it. The ATH-AC5TW's range, while perfectly adequate for standard audio, is by comparison more conventional.

The OnePlus Buds 4 also supports spatial audio, adding a simulated three-dimensional soundstage that the ATH-AC5TW cannot replicate. Taken together, the OnePlus Buds 4 holds a clear advantage across this entire specification group — broader frequency coverage, active noise cancellation, passive isolation, and spatial audio all tip decisively in its favor. The ATH-AC5TW's larger driver is the only counterpoint, and it is not enough to shift the overall balance.

Earbud battery life is close enough to call a near-tie: the ATH-AC5TW lasts 13 hours per charge versus 11 hours for the OnePlus Buds 4. That 2-hour gap is real but modest in practice — both will comfortably handle a full workday or a long-haul flight on a single charge. Where the picture shifts dramatically is in the charging case. The OnePlus Buds 4's case contributes an additional 34 hours of total battery reserve, compared to just 21 hours from the ATH-AC5TW's case. That means the OnePlus system delivers a combined total of roughly 45 hours versus the ATH-AC5TW's 34 — a gap that matters significantly for multi-day travel or users who frequently forget to charge.

Charge time further reinforces the OnePlus Buds 4's efficiency credentials. It replenishes in approximately 1 hour 20 minutes, while the ATH-AC5TW requires a full 2 hours — a 40-minute difference that adds up over repeated charging cycles. Neither earbuds supports wireless charging, so both require a physical cable connection, leaving that convenience factor off the table for both.

The verdict here is split by use case. The ATH-AC5TW has a slight per-session edge in earbud runtime, making it marginally better for single-stretch listening. But the OnePlus Buds 4 wins the overall power category on the strength of its substantially larger case battery reserve and faster charge time — factors that matter more to most users over the course of a week than a 2-hour difference in individual playback sessions.

At the foundation, these two earbuds are remarkably alike: both run Bluetooth 5.4, share an identical 10 m wireless range, support AAC for higher-quality audio streaming on compatible devices, and charge via USB-C. Neither offers NFC pairing, aptX in any of its variants, LDAC, or Bluetooth LE Audio — so users invested in those ecosystems will find no distinction here.

Two differentiators do emerge, however. The OnePlus Buds 4 supports fast pairing, which streamlines the initial device connection process — a small but genuinely convenient quality-of-life feature the ATH-AC5TW skips entirely. More substantively, the OnePlus Buds 4 also supports LDHC, a high-resolution wireless audio codec capable of transmitting at significantly higher bitrates than AAC. For users with LDHC-compatible source devices, this opens the door to noticeably richer audio transmission — a real advantage that the ATH-AC5TW, limited to AAC as its ceiling, cannot match.

The ATH-AC5TW has no meaningful connectivity advantage over the OnePlus Buds 4 based on these specs. The OnePlus pair edges ahead through fast pairing convenience and, more importantly, LDHC support — making it the stronger choice for users who prioritize high-fidelity wireless transmission and streamlined device setup.

Both earbuds share a solid common feature set: fast charging, on-device touch controls, voice prompts, a mute function, headset capability for calls, and even an included travel bag. For everyday usability, this shared baseline means neither product leaves users without the essentials.

Where they diverge is telling. The OnePlus Buds 4 adds three features the ATH-AC5TW entirely lacks: ambient sound mode, in/on-ear detection, and a find device function. Ambient sound mode lets the earbuds pipe in external audio on demand — useful when needing to hold a quick conversation or stay aware of surroundings without removing the buds. In/on-ear detection automates playback, pausing audio when an earbud is removed and resuming when reinserted, which reduces friction in daily use and conserves battery. The find device feature adds a practical safety net for users prone to misplacing small accessories.

None of these additions are gimmicks — each solves a real, recurring inconvenience that earbud users encounter regularly. The ATH-AC5TW offers no equivalent to any of them, and that absence is a meaningful gap rather than a minor omission. The OnePlus Buds 4 holds a clear advantage in this category, delivering a more intelligent and user-aware feature set on top of a comparable functional baseline.

Both earbuds feature noise-canceling microphones, so call clarity in demanding environments is a baseline expectation for either option. The meaningful distinction here is microphone count: the OnePlus Buds 4 deploys 6 microphones across its two earbuds, while the ATH-AC5TW uses 4. More microphones generally enable more sophisticated beamforming and wind noise rejection algorithms — the system has more spatial reference points to isolate the user's voice and suppress everything else.

In practical terms, this gap is most likely to surface during calls in noisy environments — busy streets, open-plan offices, or public transport — where the additional microphones give the OnePlus Buds 4 more raw data to work with when filtering ambient noise. For quiet environments, both setups should perform comparably. It is worth noting that microphone count is a hardware ceiling, not a guarantee of quality; processing algorithms matter too. However, based strictly on the provided specs, the OnePlus Buds 4 holds the hardware advantage.

The OnePlus Buds 4 takes the edge in this category. The ATH-AC5TW is by no means underequipped at 4 microphones, but the OnePlus pair's 6-mic configuration positions it better for call performance in challenging acoustic conditions.