Sony INZONE H9 II / Sennheiser MOMENTUM 4 Wireless

Sony INZONE H9 II: WH-G910N · WHG910N/B, black

Sennheiser MOMENTUM 4 Wireless: MOMENTUM 4 Wireless over-ear wireless headphones; Black (509266), White (509267), Graphite (700383) and later Brown, Teal, Copper and Denim colours. MOMENTUM True Wireless in-ear models and MOMENTUM 3 Wireless are separate products.

SpecificationSony INZONE H9 IISennheiser MOMENTUM 4 Wireless
Release year20252022
Release year2025 Sony—
DesignOver-ear, closed-back; adjustable suspension headband Sony—
WeightApproximately 260 g without microphone Sony—
Microphone weightApproximately 13 g including windscreen Sony—
MicrophoneDetachable boom; mute button and red indicator Sony—
Gaming connection2.4 GHz through USB-C receiver Sony—
Receiver modePC / OTHER switch Sony—
Bluetooth5.3; Class 1 Sony—
CodecsSBC, AAC; LC3 through LE Audio Sony—
Simultaneous connectionUSB receiver + Bluetooth phone Sony—
Analog connection3.5 mm cable; powered or passive operation Sony—
When the cable is insertedBluetooth and receiver-based wireless functions are disabled Sony—
Noise controlANC and ambient sound mode; unavailable passively Sony—
Game/chat balanceOnly with the receiver in PC mode Sony—
Volume controlPhysical volume dial during wireless use Sony—
PC softwareINZONE Hub; unavailable through a Bluetooth connection Sony—
Phone appSony Sound Connect through Bluetooth Sony—
ChargingUSB-C; full charge approximately 3.5 hours, condition dependent Sony—
Use while chargingSupported Sony—
BatteryBuilt-in rechargeable lithium-ion Sony—
Wired frequency range5 Hz–20 kHz with power off; not a wireless measurement Sony—
Impedance440 Ω powered / 21 Ω passive at 1 kHz SonyActive 470 Ω, passive 60 Ω Sennheiser
Operating temperature0–40 °C Sony—
Water protectionNot waterproof Sony—
Box contentsUSB-C receiver, USB-A–USB-C charging cable, analog cable, microphone and soft pouch Sony—
Type—Around-ear, closed-back, wireless; active noise cancelling

The ear pads fully surround the ear; Sennheiser cites a lightweight design, padded headband and deep cushioned earpads for long-wear comfort.

Sennheiser
Driver and frequency response—42 mm dynamic driver; 6 Hz–22 kHz; 106 dB SPL (1 kHz / 0 dB FS)

The frequency range describes measurement limits; the sound you hear is also shaped by the in-app equaliser and sound personalisation.

Sennheiser
Noise cancelling and microphones—Adaptive hybrid ANC; 4 microphones in total (2 per side, MEMS, beamforming; 50 Hz–10 kHz); anti-wind mode; transparency mode

Hybrid ANC uses both outer and inner microphones; adaptive mode changes the level of cancellation to match ambient noise.

Sennheiser
Bluetooth and codecs—Bluetooth 5.2, Class 1; A2DP, AVRCP, HFP; SBC, AAC, aptX and aptX Adaptive

aptX Adaptive works only with Android phones that support it; iPhones use AAC. Multipoint connections are managed in the app.

Sennheiser
Battery and charging—700 mAh lithium-ion; up to 60 hours with noise cancelling on; full charge in about 2 hours; up to 4 hours from 5 minutes of charging; USB-C 5 V 800 mA

Sennheiser says the 60 hours was measured with an iPhone at medium volume; higher volume and aptX Adaptive can shorten it.

Sennheiser
Wired use—Hi-res digital audio over USB-C; 3.5 mm / 2.5 mm analogue cable

When listening over USB-C, the headphones decode digital audio internally; the analogue cable works even with a flat battery.

Sennheiser
Controls and app—Touch surface on the right cup; Smart Pause wear detection; Auto On/Off; 5-band equaliser and Sound Personalization in the Smart Control app

Smart Pause stops playback when the headphones are taken off and resumes when they are put back on; Auto On/Off shuts them down to save power when not in use.

Sennheiser
In the box—Carry case; USB-C charging cable; audio cable with 3.5 mm and 2.5 mm jacks; airplane adapter Sennheiser
Water resistance—No IP rating listed

With no certification against sweat or rain, care is needed when it gets wet during exercise.

Sennheiser