Sony WH-XB910N Teardown: Supports 20-level noise cancelling control, and a single battery life of 50 hours

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Sony WH-XB910N is a new product launched at the end of 2021 by Sony’s product line “EXTRA BASS” that focuses on heavy bass experience. Designed to provide a new option for users who like bass. In appearance, the connection structure between the head beam and the headphone has changed from the seamless connection of the previous generation to the interspersed connection. The overall look and feel is relatively more lively and agile, with a more youthful temperament.

In terms of configuration, the headphone is equipped with a 40mm dynamic unit, which has a larger dynamic range and brings powerful bass performance. Adopt dual feedback microphones for sensitive capture of ambient noise. Support AI smart noise cancelling, automatically switch the preset ambient sound and noise cancelling scheme. Support wind noise reduction mode to deal with scenes such as windy weather, cycling, and running. Equipped with Bluetooth 5.2 chip, it brings lower power consumption and higher stability. On an Android device that supports LDAC bluetooth transmission technology, it can transmit about 3 times (or more) the amount of data in AAC or SBC encoding (the maximum transmission speed is about 990 kbps).

In terms of functions, the headphone supports touch control and has a 20-level controllable ambient sound mode. Equipped with the Sony DSEE digital sound enhancement engine, through advanced algorithms, it compensates the sampling rate of the sound source, restores some of the lost high-frequency sound, and displays the sound effect close to the original. With the Sony EXTRA BASS tuning style, it improves the low frequency extension of music and optimizes the details of mid-frequency vocals, thus providing users with a high-quality music experience. The Sony WH-XB910 has a battery life of 50 hours after noise canceling is turned off, and about 30 hours when noise canceling is turned on.

Sony headphones disassembled by 52audio include: Sony LinkBuds, Sony PlayStation 5 PULSE 3D, Sony WF-C500, Sony WF-1000XM4, Sony WF-XB700, Sony WF-H800, Sony WF-SP900, Sony XPERIA Ear Duo over-ear true wireless headphones Wait. Let’s take a look at the teardown report of the Sony WH-XB910N headphone.


01/ Sony WH-XB910N Unboxing

On the front of the headphone box, the rendering of the headphone is displayed in a large format on the right. The upper left corner is the Sony logo, the product model is “WH-XB910N”, the product series is the “EXTRA BASS” series that focuses on bass listening, and can support 30 hours of noise cancelling use.

The pictures on the back of the box show the appearance, operation and storage of the product. The text introduces the “EXTRA BASS” line of products designed to deliver an unforgettable deep and powerful sound experience. The headphone supports fast charging, and it can play up to about 4.5 hours after charging for about 10 minutes. Dual device connection, support to connect two different bluetooth devices.

Open the outer packaging of the headphones and take out the inner packaging. The inner packaging is a flip structure. When you open the inner packaging, you can directly see the storage bag containing the headphones.

The appearance of the headphone storage bag, light gray design, low-key and calm, with the Sony logo printed on the front.

Open the storage box, and the headphones are folded and placed in the storage box. The storage box also has a separate space to store the 3.5mm headphone cable and the USB A to C data cable.

USB A to C data cable.

3.5mm headphone cable, one end is L-shaped design.

The front of the headphone looks.

Sony WH-XB910N

On the side of the headphone, the headphone shell in contact with the ear can be tilted back and forth to adapt to different human ears.

At the top of the ear bridge, the leather is delicate and soft.

The Sony logo is printed on the bottom of the outer side of the ear bridge.

Headphone rail position.

After the headphone slide is pulled out.

The product model number “YY2951” is silk-screened on the inner side of the ear beam, and it is charged by 5V DC.

Headphone folded position structure.

Right ear cup.

The front of the left headphone shell has a matte texture.

The microphone pickup hole located above the headphone shell.

The pressure relief hole on the side of the headphone is covered with a dustproof net.

The front of the left headphone housing.

Type-C port for charging headphones.

Noise cancelling microphone pickup hole.

Connect the 3.5mm jack of the audio cable.

Type-C port for charging headphone.

Power/bluetooth pairing key, with a working indicator light for easy identification of working status.

Noise cancelling mode/ambient sound switch button.

Use a portable power tester to test the wired charging of Sony WH-XB910N over-ear wireless noise cancelling headphones. The charging voltage of the product is about 5.01V, the input power is about 1.18W, and the charging current is about 0.24A.


02/ Sony WH-XB910N Teardown

Through the appearance of the headphone, we can find that the left part of the headphone is provided with buttons and a charging interface, so the internal structure of the left and right headphones will be different. We divide it into two modules left and right for dismantling.

Right headphone teardown

First remove the ear cups.

Ear cups, the outer leather is fastened with a bayonet.

There is an acoustic structure cover on the top of the speaker, and the cover is fixed in position with screws.

There is a noise cancelling microphone above the speaker unit, and the microphone is protected by a rubber cover.

Remove the noise cancelling microphone rubber cover and the microphone small board circuit.

The rubber sealing cover of the noise cancelling microphone is made of silicone material, which is flexible in texture.

The noise cancelling microphone board is connected to the headphone motherboard by soldering wires.

After actual measurement, the size of the speaker unit of Sony WH-XB910N over-ear wireless noise cancelling headphones is about 40mm.

Take the speaker stand out of the front of the headphone.

Headphone and speaker circuit.

The battery is fixed on the back of the speaker bracket, and a cushioning sponge block is attached to the back of the battery.

The wires connecting the speaker and the motherboard circuit are fixed and sealed with white glue.

The cavity tuning hole is pasted with a dust-proof net.

Headphone battery label information. Charging limit voltage: 4.4V; Rated capacity: 520mAh/2.0Wh; Nominal voltage: 3.85V.

There is a cushioning sponge on the back of the battery.

The battery is from Springpower Technology (Shenzhen) Co., Ltd., the rated capacity is 520mAh/2.0Wh, the rated voltage is 3.85V, and the battery model is 702428.

The battery is equipped with a circuit protection board with an IC and thermistor for protecting the circuit.

The internal circuit of the right headphone shell.

Remove the curved small plate, there is a cushioning sponge under the small plate. The large green circuit on the back of the headphone case is the circuit that senses touch.

The cushioning performance of the sponge is good.

Fixed the acoustic cover of the noise cancelling microphone.

Remove the screw to remove the acoustic cover.

The noise cancelling microphone is also fixed with a silicone sleeve.

The silicone sleeve that holds the microphone has a dust filter.

The noise cancelling microphone adopts an electret microphone and is connected with a shielded wire to effectively prevent electromagnetic interference from affecting the sound.

The front circuit of the headphone arc small board.

The circuit on the back of the headphone arc small board.

A voltage regulator IC with silkscreen “A26”.

Three silk-screened “XD 120” ICs.

Microchip PIC16LF1509-I/ML master controller with XLP technology, 20-pin Flash, 8-bit microcontroller. The machine has a built-in high-performance RISC CPU. 16 MHz internal oscillator block with flexible oscillator structure: – Factory calibrated to ± 1 %, typical – Software selectable frequency range from 16 MHz to 31 kHz 31 kHz low power internal oscillator Three external clock modes (up to 20 MHz).

Details of the Microchip PIC16LF1509-I/ML Master Controller.

Next, enter the teardown section of the left ear.

Remove the left headphone speaker bracket.

The speaker stand is in line with the right headphone.

The internal circuit of the left headphone shell.

Noise cancelling microphone secured with an acoustic cover.

Electret microphone for noise cancelling.

The noise cancelling microphone of the left headphone is also protected by a silicone sleeve.

Arc-shaped small board circuit, with buttons and LED lights integrated on the front.

Indicator light guide structure.

Remove the arc-shaped small board, the front of the small board circuit.

The back of the small board circuit.

3.5mm audio interface female socket.

Type-C interface female socket for headphone charging.

The first button on the motherboard corresponds to the power/bluetooth button of the headphone.

The second button on the motherboard corresponds to the switch button for the “ambient sound and noise cancelling” function, as well as two LED indicators.

AC-DC module power supply with silk screen “DAS”.

Silkscreen “KPE 109” IC.

Cable ducts are used in many places inside the headphone to secure the cables.

On the back of the left headphone mainboard, there is a sponge shock absorber at the position where it contacts with the arc small plate.

The front of the left headphone motherboard.

Two MLCC capacitors.

A POSCAP capacitor for battery-side filtering.

Two ICs with silkscreen “NGBS B8D”.

Ceramic bluetooth antenna.

A voltage regulator IC with silkscreen “BUM”.

Silkscreen “UDB 1SC” IC.

Silkscreen “X:D 052” IC.

Silkscreen “AJA 104” IC.

Four silk-screened “VD 117” ICs.

4 ICs with silkscreen “NN8 121”.

Silkscreen “C1CH” IC.

The external Q128J memory is used to store firmware information.

Sony’s customized MTK MT2822SA bluetooth SoC supports 24bit, 192kHz audio. Compared with 2811 used by Sony WF-1000XM4, 2822SA has better CPU speed and DSP performance, and integrates hardware-level noise cancelling technology.

All components of Sony WH-XB910N over-ear wireless noise cancelling headphones.


03/ Summary

In terms of appearance, the Sony WH-XB910N over-ear headphones, the connection structure between the head beam and the headphones has changed from the seamless docking of the previous generation to the interspersed docking, and the overall look and feel is relatively more lively and agile. The headphones support telescopic, swivel, and foldable functions to enhance personalized wearing comfort and portability when going out.

In terms of internal configuration, the headphone bluetooth SoC adopts a customized MTK MT2822SA bluetooth SoC, supports Bluetooth 5.2, and supports music with 24bit, 192kHz audio specifications. The MT2822SA bluetooth SoC also provides a powerful CPU for the headphone, enabling it to support the DSEE digital sound enhancement engine and 20-level controllable noise cancelling.

In terms of battery life, the battery of the headphone comes from Springpower Technology, with a rated capacity of 520mAh/2.0Wh and a rated voltage of 3.85V, which can provide the headphone with a listening experience of up to 50 hours of battery life.

Source: 52audio


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