Sennheiser MOMENTUM True Wireless 4 / Sony ULT WEAR (WH-ULT900N)

Sennheiser MOMENTUM True Wireless 4: MOMENTUM True Wireless 4 (2024); Black Graphite 700365, White Silver 700366, Black Copper 700367 (Denim and Gold were added later). The over-ear MOMENTUM 4 Wireless and the in-ear MOMENTUM True Wireless 3/5 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 MOMENTUM True Wireless 4Sony ULT WEAR (WH-ULT900N)
Release year20242024
TypeTrue wireless stereo in-ear earbuds; ear-canal fit with ear fins

The box includes four sets of ear tips (XS/S/M/L) and three sets of ear fins (S/M/L).

Sennheiser		—
DriverTrueResponse dynamic, 7 mm; 5 Hz–21 kHz; 107 dB SPL (1 kHz / 1 mW)

According to Sennheiser, audio resolution up to 24-bit/96 kHz is supported with a compatible source.

Sennheiser		—
Noise cancellationHybrid ANC, adaptive to surroundings; Transparency Mode

Adaptive mode sets the cancellation level automatically for the surrounding noise; Transparency Mode lets outside sound in without removing the earbuds.

Sennheiser		—
Bluetooth and codecsBluetooth 5.4 (Classic and LE Audio); SBC, AAC, aptX, aptX Adaptive/Lossless, LC3; A2DP, AVRCP, HFP, TMAP, PBP

aptX Lossless needs a Snapdragon Sound phone that supports it; an iPhone uses AAC. According to Sennheiser, Auracast broadcast listening only arrives through a firmware update. Multipoint lets it switch between two 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
Microphones3 MEMS microphones per earbud (6 in total), beamforming noise reduction; 100 Hz–10 kHz Sennheiser—
BatteryUp to 7.5 hours per charge (ANC off) / up to 7 hours (ANC on); up to 30 hours total with the case; lithium-ion, 75 mAh per earbud, 820 mAh case

Times were measured with an iPhone at medium volume (85 dB). According to Sennheiser, 8 minutes of charging gives about 1 hour of playback; the battery protect mode in the app slows charging and slightly lowers maximum capacity to extend battery lifespan.

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
ChargingUSB-C socket on the case (5 V, 1,000 mA max) and Qi wireless charging

A USB-C cable is in the box; there is no adapter.

Sennheiser		—
DurabilityIP54 dust and splash resistance (earbuds only)

The charging case is not covered by the IP rating.

Sennheiser		—
Weight and sizeSingle earbud 6.2 g; case 66.4 g; total 72.4 g; 70.1 × 44.6 × 34.8 mm with the case Sennheiser—
AppSennheiser Smart Control for iOS and Android: 5-band EQ, Sound Personalization, Sound Zones, touch control settings

Sound Personalization was developed with Fraunhofer IDMT and builds a sound profile from the user’s reactions to sample sounds.

Sennheiser		—
Operating conditionsOperating 0 to +40 °C; charging 5 to 35 °C Sennheiser—
Noise cancelling—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
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
In the box—Connection cable, USB cable, reference guide, warranty card 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