Moondrop Space Travel 2 Ultra VS Oppo Enco Free 4

In terms of design, the Moondrop Space Travel 2 Ultra and the Oppo Enco Free 4 are virtually identical across every measured attribute. Both use an in-ear fit, are fully wireless with no cables or neckband, omit wingtips, skip RGB lighting, and offer stereo audio — with no display or UV light on either device.

Because every design spec is a direct match, there is no meaningful differentiator between the two products in this category. Users prioritizing a clean, wireless, standard in-ear form factor will find both options equally suitable.

Both earbuds share the same frequency range of 20 Hz – 20,000 Hz, full ANC, and passive noise reduction — so the core noise-blocking and tonal range foundations are equivalent. The one measurable differentiator here is driver size: the Moondrop Space Travel 2 Ultra uses a 13 mm driver versus the 11 mm unit in the Oppo Enco Free 4.

A larger driver typically moves more air, which can translate to a more authoritative low-end response and greater overall sound pressure — though real-world results depend heavily on tuning and acoustic chamber design. That said, within the context of these specs alone, the Space Travel 2 Ultra holds a modest structural advantage in potential driver performance.

Neither product supports spatial audio, Dolby Atmos, or Dirac Virtuo, so users seeking an immersive or processing-enhanced soundstage will find both equally limited. On balance, the Moondrop Space Travel 2 Ultra has a slight edge in this category, driven solely by its larger 13 mm driver unit.

Power is where the Oppo Enco Free 4 pulls ahead decisively. It delivers 11 hours of earbud battery life against just 7 hours on the Moondrop Space Travel 2 Ultra — a 57% difference that is immediately felt during long travel days, extended work sessions, or back-to-back listening. Combined with its 34-hour charging case (versus 24 hours for the Space Travel 2 Ultra), the Enco Free 4 offers a total of 45 hours of use before needing a wall outlet, compared to 31 hours for the Moondrop.

The capacity gap is backed by the raw battery figures: the Enco Free 4 packs a 62 mAh earbud cell and a 530 mAh case battery, compared to 35 mAh and 380 mAh respectively on the Space Travel 2 Ultra. Larger cells directly enable those longer runtimes. Charge time also favors the Oppo — it refills in roughly 51 minutes versus 90 minutes for the Moondrop, making it significantly more convenient for quick top-ups on the go.

Neither product supports wireless charging, so both require a cable. Still, the Oppo Enco Free 4 is the clear winner in this category across every measurable dimension — longer playtime, a larger case reserve, and faster charging make it the stronger choice for users who prioritize endurance.

The most striking connectivity divergence is Bluetooth range: the Oppo Enco Free 4 reaches up to 40 meters, while the Moondrop Space Travel 2 Ultra tops out at 10 meters. In practice, this means the Enco Free 4 can maintain a stable connection when a phone is left in another room, a bag across a gym, or a desk while the user moves around — scenarios where the Space Travel 2 Ultra is more likely to drop or degrade the signal.

On codec support, the two products take different paths. The Space Travel 2 Ultra runs Bluetooth 6 and supports LDAC — Sony's high-resolution codec capable of transmitting up to 990 kbps, making it the stronger choice for audiophiles streaming high-quality audio from compatible Android devices. The Enco Free 4 counters with LDHC, a competing high-res wireless codec that also targets lossless-quality transmission but is more tightly tied to the Oppo/HONOR ecosystem. Both also support AAC, which covers Apple device users adequately on either side.

Choosing between them depends on use case: the Space Travel 2 Ultra offers a more cutting-edge Bluetooth version and broader high-res codec recognition with LDAC, while the Enco Free 4 wins on raw wireless range. For users who value freedom of movement, the Enco Free 4 has a clear practical edge; for audio quality-focused listeners on Android, the Space Travel 2 Ultra's LDAC support is a meaningful advantage.

Across the majority of features, these two earbuds are evenly matched — both offer ambient sound mode, fast charging, a mute function, headset capability, on-device controls, voice prompts, and an included travel bag. For everyday use, this shared foundation means neither product feels noticeably more capable than the other in core functionality.

The single differentiator in this category is the built-in translator, which is present on the Oppo Enco Free 4 but absent on the Moondrop Space Travel 2 Ultra. For frequent travelers or multilingual users, this is a genuinely useful addition that removes the need for a separate translation app during conversations — a convenience that goes beyond audio playback and adds real-world utility in international contexts.

The Oppo Enco Free 4 takes this category by a narrow but meaningful margin. The translator feature is the only distinction, but it is a practical one that could be a deciding factor for a specific type of user. Those who have no need for real-time translation will find both products functionally identical here.

Microphone hardware is where the gap between these two products is hard to ignore. The Oppo Enco Free 4 is equipped with 6 microphones, compared to just 2 on the Moondrop Space Travel 2 Ultra. Both feature noise-canceling microphone processing, but the sheer number of pickup points fundamentally changes what that processing has to work with.

More microphones enable more sophisticated beamforming — the ability to isolate the user's voice from multiple angles while simultaneously suppressing ambient noise from other directions. A 6-mic array can more accurately model and reject wind, crowd noise, and environmental interference, which translates to noticeably cleaner call quality in demanding real-world conditions like busy streets or open offices. A 2-mic setup handles controlled environments well but has less spatial data to draw from when conditions get noisy.

The Oppo Enco Free 4 is the clear winner in this category. For users who frequently take calls or participate in voice meetings on the go, its 6-microphone configuration offers a structural advantage in call clarity that the Space Travel 2 Ultra's 2-mic setup cannot match on hardware grounds alone.