Sony LinkBuds Fit (WF-LS910N) / Sony WH-1000XM4

Sony LinkBuds Fit (WF-LS910N): LinkBuds Fit WF-LS910N in-ear true wireless earbuds; black, white, green and pink. The open-design LinkBuds Open (WF-L910) and the older LinkBuds S (WF-LS900N) are separate models.

Sony WH-1000XM4: WH-1000XM4 closed over-ear wireless headphones; Black, Platinum Silver and Blue. The WH-1000XM3 (previous) and WH-1000XM5 and XM6 (later) generations are separate models.

SpecificationSony LinkBuds Fit (WF-LS910N)Sony WH-1000XM4
Release year20242020
Driver and frequency8.4 mm driver; closed type; 20–20,000 Hz over Bluetooth (44.1 kHz), 20–40,000 Hz with LDAC (96 kHz, 990 kbps) Sony40 mm dome-type driver (CCAW voice coil, aluminium-coated LCP diaphragm); wired 4–40,000 Hz; Bluetooth 20–20,000 Hz (44.1 kHz), with LDAC 20–40,000 Hz (96 kHz, 990 kbps) Sony
Noise cancellingActive noise cancelling; Personal NC Optimiser; Ambient Sound Mode and Auto Ambient Sound

Personal NC Optimiser tunes cancellation to the ear shape and how the buds are worn. Auto Ambient Sound changes how much outside sound is let in depending on the surroundings.

Sony		HD Noise Cancelling Processor QN1; two noise-sensing microphones per cup; adaptive sound control

QN1 works with a new Bluetooth audio chip to sample ambient noise many times a second and cancel it with an inverse signal.

Sony
Bluetooth and codecsBluetooth 5.3; SBC, AAC, LDAC, LC3; A2DP, AVRCP, HFP, HSP, TMAP, CSIP, MCP, VCP, CCP

LC3 and profiles such as TMAP/CSIP are for Bluetooth LE Audio, enabling lower-power audio on compatible phones. LDAC is used on Android for high-bitrate streaming; iPhones use AAC.

Sony		Bluetooth 5.0; A2DP, AVRCP, HFP, HSP; SBC, AAC, LDAC; about 10 m range

LDAC enables up to 990 kbps with compatible Android phones; iPhones use AAC.

Sony
Multipoint and processingMultipoint connection (two devices); DSEE Extreme

DSEE Extreme tries to restore high-frequency detail lost in compressed music files.

Sony		—
BatteryEarbuds: up to 5.5 hours of music with ANC on and 8 hours off; up to 4 hours of calls; earbud charge about 2 hours, case charge about 3 hours (USB) Sony—
FitNewly designed Fitting Supporters and ear tips

The soft supporter fin rests against the ear’s ridge to help keep the bud in place while moving.

Sony		—
Weight and durabilityAbout 4.9 g each (with M tips); case about 41 g, 47.2 × 47.2 × 32.6 mm; IPX4

IPX4 means resistance to splashing water from any direction; it is not for submersion or swimming.

Sony		—
Multipoint—Simultaneous connection to two Bluetooth devices with switching between them

For example, you can switch between a phone and a laptop without re-pairing.

Sony
Battery and charging—Up to 30 hours with NC on, 38 hours off; full charge in about 3 hours over USB-C; about 5 hours of playback from 10 minutes

The 5-hours-from-10-minutes figure is given with the optional AC adaptor.

Sony
Wired use—Detachable cable of about 1.2 m with OFC strands and gold-plated 3.5 mm plug Sony
Microphones—Five microphones for Precise Voice Pickup Sony
Smart features—Wear detection sensor; Speak-to-Chat; DSEE Extreme

The wear sensor pauses music when the headphones come off. Speak-to-Chat stops music and lets in ambient sound when you start talking. DSEE Extreme tries to upscale compressed files in real time with AI.

Sony
Design—Closed dynamic, circumaural; cups swivel inward to fold into the carry case Sony