OnePlus Bullets Type-C Earphones

Built-In Cirrus Logic DAC

Audio Processing in the Earphone

A conventional wired earphone with a 3.5mm jack receives an analogue signal — the phone’s internal DAC converts the digital audio file to analogue, which then travels through the cable to the earphone driver. The quality of that analogue signal depends entirely on the phone’s internal DAC. The OnePlus Bullets Type-C takes a different approach: they connect via USB-C and receive the audio as a digital signal, which is then converted to analogue by the Cirrus Logic DAC built into the connector housing. Cirrus Logic is one of the audio industry’s primary DAC chip manufacturers — their CS series chips are used in high-end audio equipment. Moving the DAC into the earphone housing means the conversion quality is fixed by the Bullets’ own hardware rather than varying with the phone. The independent left and right channel processing routes each stereo channel through its own signal path rather than splitting from a shared path at the connector, which reduces crosstalk between channels. The microphone signal is also separated from the audio output channels rather than carried on the same connection, which eliminates the interference that causes the audio colouration some users hear on cheaper USB-C earphones when the mic is active.

9mm Driver · Aryphan Diaphragm

Driver and Diaphragm Materials

The 9mm dynamic driver uses an Aryphan Polyarylate diaphragm — a high-performance thermoplastic polymer with high stiffness-to-weight ratio and low internal damping. Diaphragm material in a dynamic driver directly affects sound character: soft polymer diaphragms (standard PET, Mylar) dampen vibrations readily but can smear transient detail; rigid diaphragm materials like Aryphan maintain more precise pistonic movement for cleaner midrange and transient response, at the cost of some warmth. At 24Ω impedance, the Bullets Type-C are efficiently driven from any USB-C source — the DAC handles voltage swing requirements rather than the phone’s headphone amplifier, making sensitivity consistent across devices. The 20–20,000Hz frequency range covers the full audible spectrum. Rated power at 3mW places these in the normal sensitivity range for in-ear monitors — they do not require a powerful amplifier to reach listening volume, which is the appropriate design for a DAC-equipped USB-C earphone where the signal chain is fixed by the internal DAC.

Flat Cable · Karbon Fiber · Remote

Cable Construction and Controls

The 1.15m cable uses a flat cross-section rather than the conventional round cable profile found on most earphones. Flat cables resist the loop-and-knot tangling that occurs with round cables in pockets and bags — the wider, thinner geometry means the cable folds in one plane rather than coiling randomly in three dimensions. The cable core is enamelled copper wire — a copper conductor with a thin enamel insulation layer that maintains conductivity without the oxidation that bare copper develops at signal-carrying joints. The Karbon fiber threading in the outer jacket adds tensile strength along the cable’s length, resisting the stretching and eventual conductor break that is the most common failure mode for earphone cables pulled from pockets. The 3-button inline remote provides full playback control — volume up, volume down, and a centre button for play/pause, track skip (double press), and call answer/end — on all OnePlus devices. Compatibility with non-OnePlus USB-C devices depends on the device’s USB audio implementation; on most Android devices with USB-C audio support, all three buttons function correctly.

Right choice if you…

✔ Own a USB-C OnePlus phone (any model from OnePlus 6T onwards) and want the official wired earphone
✔ Want a wired earphone with its own DAC rather than relying on the phone’s internal audio processing
✔ Want a tangle-free flat cable — practical for everyday carry in pocket or bag
✔ Need a reliable inline remote and mic for calls — independent mic channel, clear voice quality

Consider something else if…

✖ Your device does not support USB audio output — some USB-C devices (certain laptops, older Android) do not pass audio through USB-C without an adapter; check your device’s USB audio specification
✖ You want wireless earphones — see OnePlus Bullets Wireless Z or Samsung Galaxy Buds range
✖ You want a 3.5mm earphone — the Bullets Type-C is USB-C only; use a Samsung USB-C to 3.5mm adapter if you prefer a 3.5mm earphone

Technical Specifications

In the Box

Frequently Asked Questions

Will these work with non-OnePlus USB-C phones?

Yes, on any Android device that supports USB audio output — which includes the majority of Android phones with USB-C from approximately 2018 onwards. Audio playback and the microphone work on Samsung Galaxy, Google Pixel, Xiaomi, and most other Android USB-C devices. The three-button remote’s full functionality (volume up/down) may vary on non-OnePlus devices depending on the device’s USB HID audio profile implementation; the centre button (play/pause, call answer) typically works across all compatible devices.

Will these work with an iPhone or MacBook via USB-C?

iPhone 15 and later have USB-C — audio output through USB-C is supported on iPhone 15 and 16 series, so these earphones will work for audio and mic. MacBook USB-C ports support USB audio output, so audio playback works. Full remote button functionality on Apple devices is not guaranteed, as iOS and macOS use Apple’s own remote control protocol rather than the Android USB HID standard.

Why does a USB-C earphone need a built-in DAC?

USB-C carries digital audio data — the earphone must convert this to an analogue signal to drive the speaker driver. Without a built-in DAC, the earphone would need to rely on the phone’s USB audio passthrough, which varies in quality between devices. The built-in Cirrus Logic DAC in the Bullets Type-C handles the digital-to-analogue conversion in the earphone connector itself, giving consistent audio quality regardless of the phone used.

Can I charge my phone while using these earphones?

No — the Bullets Type-C occupies the single USB-C port on OnePlus phones, so simultaneous charging and listening is not possible. OnePlus phones do not have a secondary audio port. If you need to charge and listen simultaneously, a USB-C audio adapter with a pass-through charging port is the solution.

Condition

Brand New — Retail Packaging

Warranty

Manufacturer warranty (OnePlus)

Delivery

4–5 Working Days · Fully Tracked

Also Available at maibo