Meizu mblu Blus active noise canceling earphones teardown

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mblu Blus active noise cancelling earphones is mblu’s first product after officially announced its return on September 10, 2021, and it is also the beginning of the “Youth Goods” return to people’s vision. With the brand-new brand LOGO of “mblu” at a price of 199 RMB, mblu Blus wants to fight a beautiful turnaround.

The complete solution of mblu Blus active noise reduction headphones is designed and developed by Ancsonic Technology Co. Ltd. The fuselage adopts pure white color matching, and the surface of the charging case adopts multi-layer spraying process, which has both anti-scratch performance and smooth and round delicate hand feeling. The earphone is a handle-shaped in-ear design with a small volume. The earphone handle is more unique, using a flat oval structure to improve product recognition.

In terms of configuration, mblu Blus uses a 12mm ultra-large crossover diaphragm unit, a combination of soft TPU and rigid LCP material to provide surging bass and better mid- and high-frequency details. Support ultra-wideband ANC function, with a maximum noise reduction depth of 30dB. Support dual MIC intelligent call noise reduction function, bluetooth 5.2, binaural dual transmission, master-slave switching and support Flyme connection function. It supports wireless charging and has an overall battery life of 30 hours.

Previously, 52audio dismantled Meizu POP, Meizu POP 2, Meizu POP2s and other true wireless headset products, Meizu HD60 head-mounted noise reduction bluetooth headset, Meizu HD60 head-mounted bluetooth headset, Meizu EP63NC neck-mounted noise reduction headset and other products . Let’s take a look at the appearance design and internal structure configuration of this product.

|1. mblu Blus active noise canceling earphones unboxing

mblu Blus

In terms of external packaging, mblu Blus headphones continue the simple design of Meizu series TWS headphones. The packaging box has a white background, a brand new “mblu” brand LOGO on the front, a rendering of the headset appearance and the product name of the mblu Blus active noise reduction headset.

On the side of the box is the brand slogan of mblu youth products.

The graphic on the back of the box shows the six features of the product: Roaring sound effect with 12mm dynamic driver, Quletness with Active Noise Cancellation, Clear call with Environment noise cancellation, Long battery life enough listening time, Wireless charging technology put down and charge, Open the box and pair devices automatically. And the factory label of the product.

The contents of the box include earphones, eartips, charging cable and product manual.

Two pairs of silicone eartips of different sizes, one on the earphone default, a total of three specifications.

mblu Blus

The overall appearance of the mblu Blus charging case adopts a pure white body and a multi-layer spraying process on the surface, which has both anti-scratch performance and a smooth, round and delicate feel.

The top of the charging case is designed with a brand new “mblu” brand LOGO.

mblu Blus

The bottom of the charging case is the wireless charging receiving area. The printed information has the product name: mblu Blus active noise reduction earphones, product model: mblu Blu, CMIIT ID and Zhuhai Lanchen Technology Co., Ltd.

On the back of the charging case is the Type-C charging interface.

A chamfer is set at the front opening for easy opening. An LED indicator below, feedback the charging case status.

Open the charging case cover, and the inside of the cover is protected by a silicone pad. The headset is placed flat in the charging case, and there is an indicator light and bluetooth pairing button on the structure.

Bluetooth pairing button and indicator light.

charging case Metal thimble for charging the headset.

mblu Blus

The overall appearance of mblu Blus active noise reduction headphones.

mblu Blus

The overall appearance of the mblu Blus headset adopts a handle-shaped in-ear design, and is also a pure white body.

mblu Blus

There are two microphone openings on the back of the earphone handle to support the noise reduction function of dual microphone calls.

The earphone noise-reduction microphone has an opening, and the internal dust-proof net protects it.

Headphone pickup microphone opening.

The inside of the earphone has the “mblu” brand LOGO, L/R logo, and metal charging contacts.

The strip pressure relief hole inside the headphone head is covered by the internal dust-proof net.

The tuning hole of the earphone sound cavity ensures the air circulation in the cavity.

The sound mouth of the earphone adopts a metal dust-proof net to prevent foreign objects from entering the sound cavity.

After actual measurement, the overall weight of the mblu Blus active noise reduction headset is about 58.8g.

Meizu mblu Blus

A single headset weighs about 4.8g.

Use a portable power tester to perform a wired charging test on the mblu Blus active noise reduction headset, and the charging power is about 1.8W.

A portable power tester was used to perform a wireless charging test on the mblu Blus active noise reduction headset, and the charging power was about 1.3W.

|2. mblu Blus active noise canceling earphones teardown

In the unpacking part, we gave a detailed introduction to the overall appearance design of the mblu Blus active noise reduction headset. Let’s enter the disassembly part to see the internal structure configuration information of the product.

Charging case teardown

Pry open the charging case and take out the charging cockpit.

The bottom structure of the charging cockpit, the main board is fixed on the shell by screws, and the wireless charging coil is at the bottom.

Remove the screws and take out the main components of the charging case.

In the bottom structure of the charging cockpit, three magnets are used to absorb the earphones and the charging case cover. The magnet middle function button rebounds the keycap.

The main circuit inside the charging case.

The wireless charging coil is set on the magnetic barrier sticker.

On the side of the Type-C power input small board, four wires are soldered on the small board to connect to the main board.

Type-C power input on the other side of the small board.

The charging case uses a soft pack battery, model NV901638, battery capacity: 520mAh/1.924Wh, rated voltage: 3.7V, delivery schedule: August 24, 2020, from Novel. A circuit protection board is provided, which is responsible for the protection functions of the battery such as overcharge, overdischarge, and overcurrent.

The front circuit of the main board of the charging box.

The circuit on the back of the main board of the charging box, the wireless charging coil, the Type-C power input small board, and the multiple wires of the battery unit are welded on the main board.

Two LED indicators of different colors.

The Hall element of silk screen ANG AROH is used to detect the operation of opening the lid.

The pogo pin connector on the main board of the charging box for charging the earphones.

CHIPOWER TECH THP8414 power management chip is a high-efficiency power management/boost S0C chip compatible with wired and wireless charging (in line with Qi wireless charging) applications. It contains a 32-bit high-performance processor and 16KB mtp program storage space. The chip integrates a high-efficiency rectifier circuit with a maximum output power of 2.5W. Using linear charging, the maximum charging current is 500mA.

THP8414 has a synchronous boost function, which can boost the voltage of the lithium battery to 5V, and the maximum load capacity of the left and right earphones is 300mA. It supports the charging and discharging of the lithium battery. The perfect internal overvoltage, overcurrent and overtemperature protection mechanisms can keep the system in a safe and optimal working state. For TWS headset charging case and other similar applications, it can provide a minimalist single-chip solution.

The jog button is used for bluetooth pairing and connection.

Power management IC peripheral devices.

Headset teardown

Pry open the earphone cavity along the clamping line, the battery stands between the front and rear cavities, and is connected to the main board through a wire.

The speaker unit is also directly connected to the motherboard through a wire.

The speaker and battery wires are soldered to the motherboard.

The earphone uses a steel shell button battery with a capacity of 40mAh/0.148Wh and a rated voltage of 3.7V, from EVE.

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

Take out the speaker unit, the internal structure of the cavity, and the tuning hole is protected by a black fine dust-proof net.

The back of the dynamic speaker.

On the front of the dynamic speaker, the combination of soft TPU and rigid LCP material enables it to provide surging bass and better mid- and high-frequency details.

The size of the speaker unit is compared with the RMB coin.

After actual measurement, the size of the speaker unit is about 12mm.

Pry open the back panel of the headphone handle.

Inside the back plate, both ends are respectively provided with a sealed microphone pickup structure to improve the sound reception performance. There is a patch bluetooth antenna and a touch sensor in the middle, which are connected to the main board through metal contacts.

The main board in the earphone handle fits into the cavity, and is also oval in design, fixed by four positioning posts and glue.

The circuit on the side of the headset motherboard.

The circuit on the other side of the headset motherboard.

Laser carving 2045 7X03 MEMS microphone is used for voice call pickup.

Connect the pogo pin connector of the bluetooth antenna.

Connect the pogo pin connector of the touch patch.

Laser carving 2047 7X16 MEMS noise reduction microphone is used for active noise reduction and call noise reduction to pick up external environmental noise.

Bluetrum BT8922E bluetooth audio SoC adopts 40nm ULP process, built-in 32-bit high-performance RISC-V CPU, and supports DSP instructions and neural network accelerators. Built-in 8MB Flash storage unit. Built-in high-performance bluetooth radio frequency circuit, the wireless receiving sensitivity reaches -94dBm, and the transmission power is greater than 10dBm, adapting to different product forms and antenna structures.

BT8922E supports voice plus dual MIC Beamforming ENC call algorithm to provide users with a clear call experience; supports high-accuracy ANC controller, optimizes the adaptability to special boundary conditions, and prevents such as squeezing howling and sudden loud noises. System instability and other user experience problems; support bluetooth 5.2 dual-mode, integrated step-down and lithium battery charging functions, can achieve a streamlined headset design.

Ancsonic Technology’s leading active noise reduction algorithm blessed, so that the single-feed noise reduction mblu Blus, compared with the double-fed noise reduction models on the market, the noise reduction performance is not inferior. mblu Blus reduces noise evenly, giving consumers a more comfortable noise reduction experience. And it can cover the frequency band of the human voice, which has a significant effect on the experience of human voice noise reduction.

According to 52audio, Bluetrum solutions have been widely adopted by brands such as NOME, Transsion, LeTV, Lenovo, Philips, 360, Fantini, and AMOI.

Bluetrum BT8922E bluetooth audio SoC details.

Metal copper pillars for charging earphones.

The crystal oscillator on the motherboard provides a clock for the bluetooth chip.

Silk screen E63F touch IC for touch detection.

All components of mblu Blus active noise canceling earphones.

|3. Summary

mblu Blus Active Noise Cancelling Headphones, as the first product after the return of mblu, can be said to be full of sincerity. In terms of appearance design, the charging case multi-layer spraying process makes the fuselage have a delicate texture, does not stain fingerprints, and can effectively prevent scratches. The inside of the box cover is also carefully set up with a silicone pad, matched with a magnet with moderate magnetic force, the sound of opening and closing the cover is soft, and the box cover is firm and tight. The handle-shaped in-ear headphones are also more comfortable to wear, and the oval headphone handle design improves the recognition of the product.

In terms of internal circuits, the charging case uses wired and wireless power input methods, and a built-in 520mAh lithium-ion soft pack battery. The power management adopts CHIPOWER TECH THP8414 single-chip solution, which is compatible with wired and wireless charging applications. It also has a synchronous boost function to charge the internal battery of the headset.

Inside the mblu Blus earphones, a 12mm dynamic driver and a 40mAh steel shell button battery are used, which are connected to the motherboard through wires. On the motherboard, the BLUETRUM BT8922E bluetooth audio SoC, bluetooth 5.2 dual-mode, integrated step-down and lithium battery charging functions. Ancsonic Technology active noise reduction algorithm blessing, to achieve an excellent single-feed active noise reduction program. There are two MEMS microphones equipped with noise reduction algorithm to realize the function of noise reduction during calls.

Source: 52audio

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