Anker Soundcore Liberty 3 Pro true wireless noise cancelling earbuds teardown

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Soundcore is an audio brand under Anker. With the rapid development of the TWS headset market, Soundcore has continued to launch multiple series of products. Some time ago, Soundcore released the latest generation of Soundcore Liberty 3 Pro coaxial dual driver personalized noise cancelling earbuds equipped with ACAA 2.0 coaxial dual driver technology. It has been upgraded again in many aspects such as appearance, sound quality, and noise cancelling.

Soundcore Liberty 3 Pro continues the classic slider design of Soundcore Liberty 2 Pro in appearance, and is more compact overall. Through the combination of metal + mirror material, the headphone makes the overall appearance more cool and more technological. With the blessing of Fusion Comfort super comfortable wearing technology, the overall texture and wearing comfort have been further improved.

In terms of functional configuration, Anker Soundcore Liberty 3 Pro upgraded ACAA 2.0 coaxial dual driver technology, adopted 10.6mm dynamic driver, customized Knowles armature driver, supported LDAC audio decoding technology, and added 3D surround sound function. Supports HearID ANC personalized human ear adaptive active noise cancelling, has two transparency modes of complete transparency and vocal enhancement, and supports three-microphone AI call noise cancelling. Support fast charging, wireless charging, with 32 hours of comprehensive battery life.

Soundcore true wireless headphones disassembled by 52audio include: Soundcore Liberty Air 2 Pro, Soundcore Life P3, Anker Soundcore R100, Soundcore Life Dot 2, Anker Soundcore Liberty 2 Pro, Anker Soundcore Liberty Air 2, Anker Soundcore LIBERTY AIR and Anker Soundcore Spirit Pro sports waterproof bluetooth headset. Let’s take a look at the internal structure configuration of this product.

|1. Soundcore Liberty 3 Pro true wireless earbuds unboxing

The Soundcore Liberty 3 Pro packaging box uses a white background, the front is designed with the appearance of the earphone rendering, the “Soundcore” brand LOGO, product name: Liberty 3 Pro coaxial dual driver personalized noise cancelling earbuds, Hi-Res AUDIO high-definition audio certification, and Product slogan.

The back of the box introduces multiple features of the product and information about the items in the box, three breakthrough acoustic technologies, Fusion Comfort, HearID ANC, 6-microphone AI call noise cancelling, and up to 32 hours of battery life.

The ACAA 2.0 coaxial dual driver architecture is displayed on the side of the box, which has the three characteristics of open sound field, sound restoration, and full-frequency equalization.

Soundcore Liberty 3 Pro is highly recommended by 20 Grammy award-winning music producers.

The contents of the box include earphones, charging case, eartips, earwings, charging cable and document box.

A quick use guide, safety manual, warranty card, etc. are placed in the document box.

The charging cable uses a USB-A to Type-C interface, and the “Soundcore” brand LOGO is engraved on the A port.

The earphone is equipped with 4 pairs of silicone eartips and earwings, which can be freely selected according to personal needs. One of the earwings is pre-installed on the earphones.

The Soundcore Liberty 3 Pro charging case adopts an oval design similar to a pebble, a sliding lid structure, and a brand logo with a shiny surface treatment on the top. The body is coated with a hydrophobic, oleophobic and anti-fouling coating, which has a delicate touch and is not easy to stain fingerprints.

The waist line at the opening of the charging case is designed with a smooth shiny silver structure to enhance the product texture. There are three indicator lights on the front for more intuitive feedback of the remaining battery information of the charging case.

The back of the charging case is equipped with a Type-C charging interface and a battery display and bluetooth pairing function button.

The bottom of the charging case is a flat design and supports wireless charging.

Open the charging case cover, the internal cockpit is an open design, and the earphones are positioned by magnetism and grooves, making it easy to pick and place.

A hidden atmosphere breathing light is added in the charging case to feedback the headphone pairing status.

The charging case is on the side with the lid open.

Take out the earphone, the internal structure of the charging case.

The charging case covers the back structure, and three slide rail structures are designed. The silkscreen information above has the product name: Soundcore Liberty 3 Pro, model: A3952, input: DC 5V, 0.5A, product name: bluetooth headphones, CMIIT ID: 2021DJ13436, manufacturer: Anker Co., Ltd., made in China.

The thimble used to charge the earphones in the cockpit, and the round gold-plated magnet in the middle is used to attract the earphones. The R logo is also designed for users to distinguish quickly.

There are two atmosphere indicator lights in the charging case cockpit.

Anker Soundcore Liberty 3 Pro

The overall appearance of Soundcore Liberty 3 Pro true wireless noise cancelling earbuds.

Soundcore Liberty 3 Pro earbuds are bean-shaped design, using a combination of metal + mirror material, compared to the previous generation in terms of texture has been greatly improved.

The decorative sheet on the back of the earphone is of mirror glass texture, using a hot pressing film process, the mirror effect is more depth and three-dimensional. The outside of the back panel is also decorated with a bright silver structure, engraved with the words “POWERED BY AACA 2.0”.

The back panel is provided with a noise cancelling microphone opening, which is protected by a metal mesh cover to prevent foreign objects from entering the cavity.

The other end of the cover has a hidden call microphone pickup hole.

The optical sensor on the side of the earphone has a window for wearing detection function.

The metal contacts and magnets used to charge the earphones have a groove structure for better contact with the cockpit contacts.

The pressure relief hole on the top of the earphone ensures air circulation in the sound cavity.

The front cavity of the earphone is made of metal material. The obsidian black is matched with a pink gold color scheme, which makes the whole machine more technological. The soundcore brand logo is engraved on the side.

The full name of AACA 2.0 coaxial dual driver technology “ASTRIA COAXIAL ACOUSTIC ARCHITECTURE 2.0” is engraved on the bottom.

The sound outlet of the earphone adopts a spiral cover plate and is protected by a fine dust-proof net inside.

The tuning holes on the Soundcore Liberty 3 Pro earbuds are used to ensure air circulation in the sound cavity to improve acoustic performance.

Earphones Earwings models are engraved on earwings.

The L/R logo is also engraved on the earphones.

After actual measurement, the overall weight of Soundcore Liberty 3 Pro true wireless noise cancelling earphones is about 57.5g.

The weight of a single earphone is about 7.2g (with earwings).

Use a portable power tester to perform a wired charging test on the Soundcore Liberty 3 Pro true wireless noise cancelling earphones. The charging power is about 2.32W.

A portable power tester was used to perform a wireless charging test on the Soundcore Liberty 3 Pro, and the charging power was about 1.60W.

|2. Soundcore Liberty 3 Pro charging case teardown

By unpacking, we connected this product’s very textured and unique design. Now enter the teardown part to see the internal structure configuration information.

Pry open the charging case cockpit, there is a wire connection inside the cavity.

Unplug the wire connector to separate the cavity.

The bottom structure of the cockpit is provided with a battery unit and an FPC cable connecting the charging contacts, the atmosphere indicator light, and the Hall element.

The motherboard is fixed at the bottom of the charging case.

The Type-C power input and function key board are fixed on the side of the cavity and connected to the main board through wires.

Take out the main board, the wireless charging receiving coil is attached to the lower cavity.

The main board, power input board, function button board and wireless charging receiving coil circuit in the charging case.

Wireless charging receiver coil.

Type-C charging interface female socket.

The charging case function button is used for power display and bluetooth pairing.

Three LED indicators are used to feed back the information of the built-in battery in the charging case.

The circuit on the front of the motherboard.

The circuit on the back of the motherboard.

Socket for connecting the battery unit.

ZIF connector for connecting FPC cable.

Prisemi P14C1N overvoltage and overcurrent protection IC, withstand voltage up to 32V, overvoltage is fixed at 6V. The external resistance of the overcurrent protection point is adjustable, the overcurrent response time is externally adjustable, and the overcurrent protection accuracy is 10ma, which can meet the overcurrent protection requirements of various adapters and various projects.

Prisemi 14C1N detailed information.

Chipsvision CV8083 wireless charging receiver chip has the characteristics of high integration, high efficiency, low power consumption, and conforms to the WPC 1.2.4 protocol. It integrates a high-efficiency full synchronous rectifier and a low-dropout regulator (LDO), which can realize a non-contact wireless charging and receiving solution on a single chip.

CV8083 has multi-time programmable (MTP) non-volatile memory, which is convenient for updating control firmware and device functions. The chip reserves 2 general-purpose serial ports, both of which can realize standard two-wire communication; 6 GPIOs are reserved, which provides a flexible solution for system development.

According to 52audio, there are already TWS headset products under brands such as JBL, Anker, TOZO, POWCING, DaCom, Skullcandy, etc., that have adopted the ChipsVision wireless charging receiver chip.

Sinhmicro SS881Q POWER MCU, adopts 4*4mm QFN24 package, internally integrates battery charging management and single-chip microcomputer, which can realize functions such as power management and charging case control.

SS881X is Sinhmicro’s AD-type Flash MCU series that integrates charge and discharge management, with built-in rich interface functions, flexible configuration modes and different low-power options. This product is mainly used in portable intelligent electronic devices that require charging and intelligent control, bringing streamlined peripheral costs, excellent performance, and flexible and convenient development.

According to 52audio, there are many models including Xiaomi, OPPO, 1MORE, Edifier, Redmi, ZMI, realme, FIIL, Anker, Lenovo, LINNER, Astrotec, Nubia, Razer, HTC, Soundcore, JBL and other brands The charging cases of TWS earphones all adopt Sinhmicro’s solutions in large quantities.

ETAsolutions ETA1061S2G synchronous rectification boost chip with adjustable output voltage, used to boost the built-in battery output to charge the earphones. The ETA1061 series has the industry’s lowest ultra-low standby power consumption, which can effectively extend the battery life of the charging bay. The high-efficiency synchronous boost controller increases the number of discharges to the headphone; the small package and streamlined periphery also greatly save the PCB area, which is very suitable for space-constrained TWS headset product applications.

According to 52audio, audio products under many brands such as Huawei, Xiaomi, Honor, OnePlus, realme, Edifier, 1MORE, Soundcore, UGREEN, RAPOO, Philips and other brands have adopted ETAsolutions power management solutions.

ETAsolutions ETA1061 details.

A magneto-adhesive power inductor is used to charge the earphones with a boost chip.

Remove the battery assembly at the bottom of the cockpit.

The bottom structure of the charging case cockpit is provided with multiple magnets for absorbing the earphones.

FPC cable and the front circuit of the atmosphere lamp small board.

FPC cable and the circuit on the back of the ambient light small board.

The Pogo Pin connector for charging the earphones has a magnet for adsorption in the middle.

The back is provided with a plastic board for reinforcement and fixation.

Charging case ambient light, sealed with rubber rings on both sides.

With the Hall element of silk screen AT1H, the magnetic field changes when the charging case cover is turned on and off will be sensed by the Hall element, and the charging case MCU and earphone will be notified to pair or disconnect with the connected device.

A cylindrical soft-pack lithium battery is used inside the charging case, which is connected to the motherboard through wires and sockets.

Lithium-ion battery model: VDL13380, voltage: 3.7V, capacity: 500mAh/1.85Wh.

The battery is equipped with a circuit protection board, a lithium battery protection IC with silk-screen G3JE and 8205MOS tube.

|3. Soundcore Liberty 3 Pro earbuds teardown

Enter the teardown part of the earphone and pry open the metal front cavity along the parting line.

Remove the back cover of the earphone.

In the inner structure of the cover, you can see the metal contacts of the bluetooth antenna and the touch detection patch. The two ends of the cover are equipped with a microphone pickup structure to improve the radio performance.

The headphone motherboard is fixed by a hot-melt plastic column, the middle metal shield is a hollow area where the battery is placed, and there is a cable at the bottom right to connect to the motherboard through a BTB connector.

Pick up the connector and remove the motherboard. The hollow area inside the motherboard is protected by a sponge pad.

In the internal structure of the cavity, the battery is placed obliquely based on the cavity space and fixed by glue.

Circuit on the motherboard side.

On the other side of the motherboard, there is a shielding sticker on the main control chip area on the right.

BTB connector female socket for connecting battery unit cables.

Screen printing 1V Bc battery protection IC.

The touch detection IC of Silkscreen 2E.

Two metal shrapnel used to connect the bluetooth antenna.

TPS SY5500 bluetooth headphone charging and communication solution. SY5500 is a chip specially designed for TWS earphones, providing a perfect solution for charging and isolating communication. The chip integrates linear charge management, discharge protection, single-wire two-way data communication (bin and headphone) and I2C communication interface, which is convenient for users to realize headphone charge and discharge management and protocol communication.

According to 52audio, the TPS power management chip has been adopted by well-known brands such as Xiaomi, OPPO, OnePlus, realme, Transsion, MEIZU, 1MORE, Baidu, Edifier, JBL, HARMAN, Lenovo and so on.

BES BES2500YP ultra-low energy bluetooth audio SoC, supports dual-mode bluetooth 5.2, adaptive ANCactive noise cancelling function, and integrates high-fidelity audio DAC and ADC. By integrating the high-performance dual-core STAR-MC1 MCU subsystem and the ultra-low-power Sensor Hub subsystem, the power consumption is greatly reduced, and it also has powerful application processing capabilities. And through the BES patented IBRT technology to optimize the TWS application and improve the RF performance in the TWS system.

According to 52audio, the current BES2500 series main control chip has been adopted by a number of TWS headphone products under OnePlus, OPPO, Honor and other brands. There are also true wireless headphones from brands such as Samsung, Xiaomi, OPPO, JBL, 1MOER, Baidu, OnePlus, Transsion, etc., which have adopted a large number of BES solutions.

The crystal oscillator that provides the clock for the bluetooth chip.

The MEMS noise cancelling microphone of the laser carving M 15090 is used for the noise cancelling function to pick up external environmental noise.

The call microphone of the same specification is used for voice call pickup.

Take out the iron acoustic structure of the coaxial ring inside the front cavity.

In the internal structure of the front cavity, a fine dust-proof net is attached to the tuning hole to prevent foreign matter from entering the sound cavity.

The front of Soundcore Liberty 3 Pro coaxial dual driver.

The back of Soundcore Liberty 3 Pro coaxial dual driver.

The speaker cable is connected to the battery cable through the BTB connector.

The armature driver is fixed by a rubber cover, and an inward microphone is set on the side cable.

Soundcore customized armature driver, engraved with Soundcore brand LOGO, laser engraving model: 62451, from knowles electronics.

The sound port of armature driver.

Laser carving M5 17P80 MEMS microphone, used to pick up the internal noise of the ear canal.

The front of the dynamic driver.

Dynamic driver and RMB coin size comparison.

After actual measurement, the dynamic size is about 10.82mm.

Take out the battery unit in the cavity and the internal structure of the cavity.

The inside of the earphone pressure relief hole is protected by a fine dust-proof net.

The inside of the optical sensor window.

On the side of the internal components of the rear cavity, a soft-pack button battery is used, and there is no silk-screened product parameter information on the battery.

The other side of the internal components of the back cavity.

Optical optical sensor is used to detect the wearing state of the earphone, and realize the function of automatically pause playback when picking up, and automatically resume playback when wearing.

The metal contacts for charging the earphones and the magnets for adsorbing the charging case cockpit.

BTB connector for connection with the motherboard.

Silkscreen NL3 IC.

Anker Soundcore Liberty 3 Pro true wireless noise cancelling earbuds all components.

|4. Summary

Anker Soundcore Liberty 3 Pro true wireless noise cancelling earbuds adopt a classic sliding hinge opening design in appearance, making the opening experience very convenient. The decorative piece on the back of the bean-style earphones is made of mirrored glass, which has a more depth and three-dimensional effect. The front cavity of the earphone is made of metal material, matched with a pink gold color that is different from the body, making the earphone very technological style. The overall appearance has a very strong texture performance and recognition.

In terms of internal circuits, the charging case has a built-in lithium-ion battery with a capacity of 500mAh, which supports both wired and wireless input power. Wired uses Type-C interface, Sinhmicro SS881Q POWER MCU charges the built-in battery, and integrates the function of a single-chip microcomputer for multi-function control of the charging case. Wireless uses ChipsVision CV8083 wireless charging receiving chip, which integrates high-efficiency full synchronous rectifier and low-dropout voltage regulator, which can realize the non-contact wireless charging receiving solution on a single chip. Also used Prisemi P14C1N overvoltage and overcurrent protection IC, ETAsolutions ETA1061S2G synchronous rectification boost chip and so on.

Soundcore Liberty 3 Pro earbuds part is equipped with a coaxial dual driver and 3 internal MEMS microphones. A soft-pack button battery is used, and TPS SY5500 provides a set of solutions for charging and isolating communication. The main control chip adopts BES BES2500YP ultra-low power bluetooth audio SoC, supports bluetooth 5.2, adaptive ANC function, and integrates high-fidelity audio DAC and ADC internally to provide excellent noise cancelling function and high-quality sound quality.

Source: 52audio


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