The Tune 310C USB-C is a Harman-owned JBL wired in-ear set aimed at phones, laptops and consoles that no longer carry a 3.5 mm socket. It belongs to the Tune family, the entry range of the JBL headphone catalogue, and dates from 2023. JBL describes it as Hi-Res certified and positions it as an everyday set for work, home and travel, with a flat cable, an inline remote and a microphone for calls. The drivers are voiced to the JBL Pure Bass target, the same tuning label that appears on the wireless Tune over-ear models.
Key specs that matter
Inside every earpiece sits one 9 mm dynamic driver, and the published bandwidth runs from 20 Hz up to 40 kHz. Nominal impedance is 16 ohm, and sensitivity is quoted as 98 dB SPL at 1 kHz with 1 mW of input. The whole headset weighs 14.3 g. The built-in microphone has a rated sensitivity of -42 dBV/Pa at 1 kHz, and the maximum operating temperature given by the maker is 45 degrees C. The box contains the headphones, ear tips in three sizes, plus warranty and safety leaflets.
Engineering and use context
The main design choice is the plug. Instead of an analogue jack, the lead terminates in a USB-C plug, so the earphones draw their signal from the digital port of PCs, mobiles and gaming devices. JBL still advises buyers to check USB-C audio compatibility with their own device before relying on it, since not every host exposes audio over that port. The three-button remote on the cable handles playback, volume and call answering, and it also switches between three equaliser presets named Default, Bass and Vocal. Because those presets live in the remote, the curve stays the same whichever phone or computer the earphones are plugged into, with no app required. The flat cable is shaped to resist knotting when it is stuffed into a pocket or bag. With no Bluetooth radio and no battery inside, there is nothing to charge and no pairing step before use.
Pairing
The natural partners are USB-C phones, tablets and computers that output audio through that port, where the earphones need no extra amplifier or dongle. Owners of older devices with only a 3.5 mm output or a Lightning port would need a different JBL model or an adapter, because this cable offers no analogue connection.
Alternatives
The JBL Tune 305C USB-C is a related wired Hi-Res earbud from the same Tune family, fitted with larger 12.5 mm dynamic drivers and the same style of three-button remote with EQ presets.