Sennheiser ACCENTUM Plus Wireless / Sony ULT WEAR (WH-ULT900N)

Sennheiser ACCENTUM Plus Wireless: ACCENTUM Plus Wireless around-ear wireless headphones; black (700176) and white (700177). The cheaper ACCENTUM Wireless and the higher-end MOMENTUM 4 are separate models.

Sony ULT WEAR (WH-ULT900N): WH-ULT900N (printed code YY2981) closed over-ear wireless headphones; Black, Off-White, Forest Gray. ULT FIELD speakers and the WH-1000X series are separate products.

SpecificationSennheiser ACCENTUM Plus WirelessSony ULT WEAR (WH-ULT900N)
Release year20242024
TypeHeadband, around-the-ear (circum-aural) wireless headphones; fold flat

Sennheiser promises a light, ergonomic fit with a soft silicone inner headband and cushioned earcups; folded flat it measures about 16.5 × 19.5 × 4.8 cm.

Sennheiser		—
Driver37 mm dynamic; 10 Hz–22 kHz; 106 dB SPL; THD below 0.3%

Sennheiser says the driver is mounted at an angle. Impedance is 560 ohms in active mode and 95 ohms in passive (wired, powered off) mode.

Sennheiser		—
Noise cancellingHybrid adaptive ANC; Transparency mode; automatic anti-wind mode

Hybrid ANC measures noise with microphones both outside and inside the earcup; the adaptive version changes the cancellation strength automatically with ambient noise. Transparency mode lets outside sound in with a touch.

Sennheiser		Digital active noise cancelling with Integrated Processor V1 and Dual Noise Sensor; Ambient Sound mode

Two mics on each cup sample outside noise and the processor generates an inverse signal; Ambient Sound mode lets you hear announcements and speech without removing the headphones.

Sony
Bluetooth and codecsBluetooth 5.2, class 1; SBC, AAC, aptX, aptX Adaptive; A2DP, AVRCP, HFP, HSP

aptX Adaptive is a Qualcomm codec that adjusts bitrate to link quality on compatible devices.

Sennheiser		Bluetooth 5.2; A2DP, AVRCP, HFP, HSP; SBC, AAC, LDAC; about 10 m range

LDAC carries audio at a higher bitrate from Android devices; iPhones do not support LDAC and use AAC.

Sony
Battery800 mAh lithium-ion; up to 50 hours with ANC on; full charge about 3.5 hours; 5 hours from 10 minutes

Sennheiser measured the 50 hours with an iPhone at medium volume; charging is via USB-C at 5 V, up to 700 mA.

Sennheiser		Music up to 30 hours ANC on, 50 hours off; calls up to 30 hours ANC on, 40 hours off; about 3.5 hours to charge over USB Sony
Controls and sensorsTouchpad on the right earcup; dedicated pairing button; Smart Pause when removed

Tap plays or pauses, sliding up and down sets volume, and swiping sideways skips tracks or answers calls.

Sennheiser		—
MicrophonesTwo MEMS microphones with beamforming for noise reduction; 50 Hz–8 kHz Sennheiser—
AppSennheiser Smart Control (iOS and Android); 5-band equaliser, presets, Sound Personalization

Sound Personalization adjusts the sound to the user with a listening test developed with the Fraunhofer Institute.

Sennheiser		—
In the boxHeadphones, USB-C charging cable, carry case, auxiliary (3.5 mm) audio cable, quick guide SennheiserConnection cable, USB cable, reference guide, warranty card Sony
Weight227 g Sennheiser—
Driver and ULT button—40 mm dome-type closed dynamic driver with neodymium magnet; ULT button for bass-heavy sound mode

The ULT button switches to a strong bass setting with one press; the app equaliser can tune the sound further.

Sony
Frequency response—5–20,000 Hz (JEITA, wired); 20–20,000 Hz over Bluetooth (44.1 kHz sampling) Sony
Multipoint and sensor—Two Bluetooth devices at once; wear sensor (pauses music when removed)

You can switch between a phone and a computer without re-pairing.

Sony
Wired use—Detachable single-sided cable of about 1.2 m, gold-plated L-shaped 3.5 mm plug; passive operation supported

When the battery is flat you can keep listening over the cable; audio over USB-C is not listed.

Sony
Microphone and processing—Electret condenser, omnidirectional microphone; DSEE

DSEE tries to restore high frequencies lost in compressed music.

Sony
Impedance and sensitivity—314 Ω on, 32 Ω off (1 kHz); 110 dB/mW on, 100 dB/mW off (wired) Sony
Weight and colours—About 255 g; Black, Off-White, Forest Gray Sony
Service program—Free repair until 31 January 2027 for cracks in the rotating shaft between headband and housing on specific serial numbers

The serial number is printed inside the left hanger; Sony provides affected ranges and a checker per colour. The crack can cause the housing to detach. Ranges listed in Canada: Black 1000001–1164062, Off-White 2000001–2040144, Forest Gray 3000001–3026514.

Sony