Huawei Freebuds Studio bluetooth 5.2 Headphones ANC 6 Mic Noise Cancelling L2HD AAC HiFi Stereo Audiophile Wireless Gaming Headset
Huawei’s Mate40 series global conference was successfully held on October 22, 2020. In addition to mobile phones, the biggest hot spot at the conference was Huawei’s first headphone FreeBuds Studio officially unveiled. Until the end of the China conference on October 31, this product was officially launched in China, and the previously released Huawei FreeLace Pro noise-cancelling bluetooth headphones and Huawei FreeBuds Pro true wireless noise-cancelling headphones formed the strongest lineup of Huawei noise-cancelling headphones , Has a strong competitiveness in the bluetooth headphone market.
The overall appearance of Huawei FreeBuds Studio wireless headphone is simple and stylish. The outstanding feature is that the head beam and the headphone connection structure adopts interspersed stainless steel cylindrical slender arms, which makes the entire headphone appearance very recognizable; the head beam part of the headphone is integrated. The whole is wrapped in black material; the inner side seems to have the same structure, the top position is filled with soft material, and the two sides are stretch structure cabins; the earmuffs are made of skin-friendly double-layer protein leather, making it more comfortable to wear.
Functionally, it not only supports active noise reduction, wearing detection and other functions, but also has intelligent dynamic noise reduction, dual transparent transmission mode, broadband high-resolution sound quality, dual-device simultaneous connection and seamless switching, and full-scene intelligent interactive experience. Let’s take a look at the internal structure of this product!
1. Huawei FreeBuds Studio headphone unboxing
The HUAWEI FreeBuds Studio headphone packaging box adopts the structure of heaven and earth cover, and the design is simple. Only the product name on the front: HUAWEI FreeBuds Studio wireless headphones, three product features: smart dynamic noise reduction, wideband high-resolution sound quality, and ambient sound transmission mode; and Huawei’s brand LOGO; a large area in the middle shows part of the appearance of the product.
On the back of the box, there are many product features of graphic analysis, including smart dynamic noise reduction, 48kHz broadband sound unit, high-resolution audio transmission, ambient sound transparent transmission mode, 6-microphone high-definition call, and dual device connection. There is some company information below.
Open the box, there is a storage bag and a quick guide inside. The headphones and accessories are placed in the storage bag.
The headphone storage box zipper uses the same leather material as the headphone.
The HUAWEI brand LOGO also uses a square mirror design.
Open the storage box, the headphones are placed in the protective bracket of the storage box, and the storage box is also equipped with a desiccant. This product dismantled this time is the morning gold color.
The accessory charging cable is placed in the hidden groove of the protective bracket, and the cover is fixed by magnetic attraction, and is designed with lifting ears for easy opening.
USB-A to Type-C charging cable.
Compared with black, the color of Chenxi gold is more textured and can highlight individuality, while black is more stable.
The appearance of the headphone is shown on the side.
The appearance of the headphone is displayed.
Display of headphone wearing status.
The headphone beam part is an integrated design, and the inner and outer sides are wrapped in two materials. The outer material has high toughness and can achieve a maximum bending degree of 150 degrees; the inner side seems to have the same structure, the top position is filled with soft material, and the two sides are tensile structure cabins.
The connecting structure between the head beam and the headphone adopts a slender stainless steel cylindrical arm that intersperses.
A small angle of rotation up and down can be realized between the arm and the headphone.
The arm rotating structure can achieve about 90 degrees of inward rotation and about 30 degrees of outward rotation.
A close-up of the tensile structure of the cylindrical stainless steel arm, which can achieve a maximum extension of about 40mm.
A close-up of the left ear muff, made of skin-friendly double-layer protein leather; there is a dust-proof mesh pad inside, and the L/left logo is printed on the mesh pad.
The inside of the earmuffs presents a certain angle of inclination, and you can feel the obvious structural bulge even when touching.
The HUAWEI LOGO is printed on the back panel of the headphone.
The circular hole matrix noise reduction microphone has openings for collecting external noise.
The second headphone microphone has an opening and is covered by a dust-proof net inside.
ANC switch close-up, realize one-key switching of normal/noise reduction/transparency modes.
The third headphone microphone has an opening, and the inside is also covered by a dust-proof metal mesh.
Go to the right earmuff, there is R/right logo inside the earmuff.
The back is a control panel with touch control instructions attached.
Swipe left and right to play up and down songs, slide up and down to increase or decrease the volume, double-click to pause playback and answer and hang up in call mode.
Right ear microphone opening.
A close-up of the power switch and bluetooth connection button, with an indicator light in the middle.
The third microphone hole in the right ear.
Type-C charging interface supports fast charging.
The right ear noise reduction microphone has an opening.
52audio used the ChargerLAB POWER-Z KM001C portable power tester to perform a wired charging test on the Huawei FreeBuds Studio wireless headphone. The charging power was about 5.6W.
2. Huawei FreeBuds Studio teardown
From the unboxing part, we have roughly understood some of the configuration and layout of this product. Let’s enter the disassembly link to look at the internal structure of this product in detail.
First remove the two buckle fixed earmuffs.
Inside the earmuffs, it can be seen that the earmuffs and the dust-proof mesh pad are not in the same structure.
The dust-proof mesh pad is composed of two materials, the outer layer is woven material, and the inner side has a thicker sponge pad.
The foam pad is designed with grooves and presents a certain inclination angle.
The cover under the sponge pad and the cavity are fixed by screws, and there is white foam under the screws for cushioning.
Open the foam pad, and the noise-reducing microphone position has a sponge hole to reduce the influence of the dust-proof mesh pad on the microphone pickup.
Tear off the dust-proof mesh pad to get a view of the cavity structure.
Inside the dust-proof mesh pad, the notch is the opening for the noise reduction microphone.
The front of the dust filter pad.
The speaker unit is placed obliquely at a certain angle, which is more in line with the structure of the human auricle, so that the sound can be better received by the ear; the speaker cover is also placed with a noise-reducing microphone, and the antenna for wearing detection is half-surrounded around the unit.
There is also an embedded small sealing cover on the speaker cover. The noise reduction microphone and the wearing detection unit are connected to the main board, protected by a transparent cover and sealed by glue.
Huawei FreeBuds Studio wireless headphone adopts a capacitive wearing detection solution.
Noise reduction microphone, used to pick up noise in the ear, the back of the microphone is sealed with glue. Huawei FreeBuds Studio uses a total of 4 ANC noise reduction microphones with a diameter of 6mm customized by Xingang Electronics.
A close-up of the air guide hole of the cavity, covered by a dust-proof net.
A sealing rubber ring is arranged at the seam of the headphone shell.
Open the transparent cover, and the small board is connected to the left ear motherboard through the BTB connector.
Pry open the BTB and remove the screws.
Remove the list of the internal structure of the speaker unit cavity.
There is also a removable cover on the back of the speaker unit.
Sound cavity bass inverter tube.
On the speaker board, the noise reduction microphone wire is welded and reinforced with glue.
An IC with silkscreen 356H 2034 J8R on the small board is used for headphone wearing detection.
The pressure relief hole of the sound cavity keeps air circulation in the sound cavity.
Remove the screw to open the sound cavity.
Inside the sound cavity cover, there are three cushions at the junction with the speaker to reduce cavity resonance.
Three sponge cushions.
The joints of the sound cavity cover are coated with sealant.
The joints of the headphone air holes are also protected by glue.
There is a layer of damping paper on the back of the speaker.
Speaker model A09XA1, wire welding, glue protection and reinforcement.
According to 52audio’s actual measurement, the speaker size is 40mm, which is consistent with the official publicity.
Remove the speaker unit, the cavity has a motherboard, battery unit, noise reduction microphone, and dual antennas.
Patch bluetooth antenna 1, model CC-ROC-L-Z V2. Huawei FreeBuds Studio uses the chip TWS architecture, and the left and right ears are equipped with a total of 4 antennas for diversity reception to enhance sensitivity.
Patch bluetooth antenna 2, model CC-ROC-L-F V3.
Laser carving G361 0B46 MEMS silicon microphone, used to pick up the voice of the call.
Remove the screws and remove the motherboard cover.
Inside the left ear motherboard cover.
All components on the left ear motherboard are connected by BTB connectors.
The battery unit BTB connector is fixed with screws.
Lithium-ion polymer battery external label information has model: HB681636ECW; battery capacity 410mAh/1.56Wh; nominal voltage: 3.82V; charging limit voltage 4.4V; executive standard: GB 31241-2014; made in China.
Tear off the external label, the soft pack battery supplier is from ATL New Energy Technology Co., Ltd., size 671634.
According to 52audio, several recent popular products Samsung Galaxy Buds Live true wireless noise-cancelling headphones, Huawei FreeBuds Pro true wireless noise-cancelling headphones, OPPO Enco X true wireless noise-cancelling headphones all use ATL battery products.
The battery is equipped with a protective circuit board, and the components on the circuit board are protected by a large amount of hard glue.
The front of the battery unit cable.
The back of the battery unit cable.
The battery unit cable consists of two parts, which are connected through the BTB connector.
Remove the screws, take off the main board, and get an overview of the internal structure of the cavity.
A close-up of an electret microphone, welded to the motherboard, reinforced with red glue, used to pick up external noise.
On the front of the left ear motherboard, the left side is covered by a partial metal shield.
There are many IC chips on the back of the motherboard, and the CSP packaged chips are all glued and reinforced.
Two coaxial bluetooth antenna sockets, with a silk-printed TX IC in the middle.
There is a TVS diode with silk screen B1 next to the connector on the battery unit cable motherboard.
TI Texas Instruments TLV62084 2A output synchronous rectification step-down converter.
TI Texas Instruments BQ25601 battery charge management and system power path management IC, used to charge the built-in lithium battery of the headphone.
Two silk-screened Q64FWY memory.
The IC of silk screen 716.
The IC of the silk screen CD.
The reserved chip pad and an IC with a silk screen 041N.
The voltage regulator IC of silk screen OZ.
AK4377A is a stereo advanced 32-bit high-quality audio DAC with a built-in ground reference headphone amplifier. The internal circuit integrates a 32-bit digital filter to provide better sound quality, low distortion characteristics and wide dynamic range. The sampling frequency is up to 384 kHz.
AK4377A detailed information.
Silk-screen ABOQ IC.
ADI ADAU1787 audio DSP chip, built-in 4ADC and dual DAC, used for active noise reduction.
According to 52audio, many products of brands such as Amazon, BOSE, and Xiaonia have adopted ADI’s TWS noise reduction solution.
ADI ADAU1787 details.
Pry open the metal shield, there is a Hisilicon Hi1132 chip inside for bluetooth connection.
Let’s teardown the right headphone.
Various authentication information is printed on the upper edge of the right ear speaker unit frame.
Made in China by Huawei Terminal Co., Ltd.; Model: M0001; IC: 25182-M0001; CMIIT ID: 2020DP696 and other information.
Open the dust-proof net pad, the structure of the lower speaker unit is the same as that of the left ear.
Pry open the transparent cover and open the BTB connector.
Remove the screw to open the cavity, the speaker unit and the left ear have the same structural configuration and will not be repeated.
The internal components of the right ear cavity are listed. The structure of the headphone components is similar to that of the left ear, and there is another battery built in the right ear.
The cavity is also equipped with dual antennas.
The lithium-ion polymer battery in the right ear has the same specifications as in the left ear. Model: HB681636ECW; battery capacity 410mAh/1.56Wh; nominal voltage: 3.82V; charging limit voltage 4.4V.
Remove the screws and remove the motherboard cover.
A close-up of the Type-C charging interface, which is fixed by a metal pressure plate and screws.
Close-up of the metal pressing plate, connected to the conductive cloth and grounded.
The front of the motherboard on the right ear.
Right ear on the back of the motherboard.
Laser carving HI98 MEMS silicon microphone.
Silk screen N6S IC.
AWINIC AW9106B LED driver for indicator light drive.
Details of AWINIC AW9106B.
Silkscreen TU’s IC.
TI (Texas Instruments) BQ25601 battery charge management and system power path management IC, consistent with the left ear.
Silk screen 12K IC.
The IC of the silk screen 71L.
Two Q64FWY memories identical to those on the left ear motherboard.
Silk screen 5LOFS IC.
AK4377A is a stereo advanced 32-bit high-quality audio DAC headphone amplifier for driving headphone speakers.
Silkscreen 041N IC.
ADI ADAU1787 audio DSP chip, built-in 4ADC and dual DAC, used for active noise reduction.
ST STM32L476 is an ultra-low-power microcontroller based on a high-performance ARM®Cortex®-M432-bit RISC core, with an operating frequency of up to 80 MHz. Embedded high-speed memory, flexible external memory controller (FSMC) for static memory.
The Cortex-M4 core has a floating-point unit (FPU) single-precision and supports all ARM single-precision data processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU), thereby enhancing the security of the application.
ST STM32L476 detailed information.
The Type-C charging interface also uses a BTB connector to connect to other components, and a conductive cloth is attached to one side of the metal sheet.
Type-C charging port on the other side.
A waterproof rubber ring is provided at the interface.
Azoteq IQS572 capacitive touch controller, used to detect touch operations on the headphone panel.
The IQS5xx series is a capacitive sensor controller designed for multi-touch applications, using projected capacitive touch panels. The product can provide high-sensitivity proximity wake-up and contact detection, while having ultra-low power consumption.
The realization of multiple filters to detect and suppress noise, track slowly changing environmental conditions, and avoid the impact of possible drift. Automatic adjustment (ATI) allows to adapt to a wide range of touch screens without the use of external components.
Azoteq IQS572 details.
A close-up of the headphone pressure relief hole, located in the groove of the arm.
Inside the pressure relief hole.
Cut the metal shield, the inside is also Hisilicon Hi1132 processor.
All components of Huawei FreeBuds Studio noise-canceling bluetooth headphone.
3. 52audio summary
The overall appearance of Huawei FreeBuds Studio wireless headphone is simple and stylish. The integrated design of the stainless steel cylindrical slender arm and the headphone beam improves the appearance of the product. The structure and functionality are also relatively complete, which can realize up and down, left and right rotation and expansion. Improve personalized wearing; the only thing missing is the folding structure, but compared to the small volume plus the portable storage bag, the overall impact is relatively small; the skin-friendly double-layer protein leather material of the earmuffs also makes the wearing more Comfortable.
In terms of internal structure configuration, it can be regarded as a mirror design. The speaker unit uses a 40mm polymer composite diaphragm speaker with an AK4377A HiFi chip to provide low distortion and high sound quality. In addition, the inclined placement of the speaker unit is more in line with the structure of the human auricle, so that the sound can be better received by the ear; the large-area capacitive wear detection sensor realizes more accurate detection, and the headphone uses four MEMS microphones and four electrets A combination of body microphones.
Both the left and right headphones are equipped with ATL 410mAh lithium-ion batteries, which have a total battery capacity of 820mAh, which can achieve a battery life of 20h in noise reduction mode. It is equipped with TI BQ25601 battery charge management and system power path management IC; also uses the chip TWS architecture, and adds 4 antennas for diversity reception to enhance sensitivity.
The active noise reduction solution uses the ADI ADAU1787 audio DSP chip, and four microphone units are respectively equipped in the left and right ears to achieve more accurate environmental noise detection and achieve deeper noise reduction performance. A Huawei Hisilicon Hi1132 chip is also used on the motherboard for bluetooth connection. The difference is that the right headphone also uses an ST STM32L476 ultra-low-power microcontroller for control of the whole machine, and an Azoteq IQS572 capacitive touch controller for touch operation.
The last thing to say is that a large number of BTB connectors are used between the various components of Huawei FreeBuds Studio, and the connectors can minimize manual participation in the production process, improve the automation process, reduce assembly time and cost, and increase the output per unit time. Fully automated production is the goal that every company is pursuing. This product also reflects the process of Huawei’s fully automated production.
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