Sony INZONE H9 II / Sennheiser ACCENTUM Plus Wireless

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

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.

SpecificationSony INZONE H9 IISennheiser ACCENTUM Plus Wireless
Release year20252024
Release year2025 Sony—
DesignOver-ear, closed-back; adjustable suspension headband Sony—
WeightApproximately 260 g without microphone Sony227 g Sennheiser
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 Sony800 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
Wired frequency range5 Hz–20 kHz with power off; not a wireless measurement Sony—
Impedance440 Ω powered / 21 Ω passive at 1 kHz Sony—
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—Headband, 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
Driver—37 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 cancelling—Hybrid 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
Bluetooth and codecs—Bluetooth 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
Controls and sensors—Touchpad 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
Microphones—Two MEMS microphones with beamforming for noise reduction; 50 Hz–8 kHz Sennheiser
App—Sennheiser 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 box—Headphones, USB-C charging cable, carry case, auxiliary (3.5 mm) audio cable, quick guide Sennheiser