JBL is an audio brand owned by Harman Kardon. As an old audio manufacturer in the United States, JBL has a full range of capabilities from raw material development to speaker unit design and production to speaker design and production. series of processes. Its audio product service range is very wide, covering professional fields and civilian levels, and its presence can be seen in various audio fields.
This time, I Love Audio Network brings you the JBL CHARGE4 Shockwave 4th Generation Wireless Bluetooth Speaker. This product continues the design of the previous generation product in appearance, with a cylindrical shape and the entire body is woven with mesh. pack. The configuration uses 50*90mm track speakers, and the maximum output power is increased to 30W; the charging interface is upgraded to Type-C, the battery life reaches 20h, and can be used as a power bank; it also supports IPX7 waterproofing and multiple series connection functions. Today let’s take a look at the internal structure of this speaker product~
1. Unboxing of JBL CHARGE4
The packaging box adopts a horizontal design, with the JBL brand LOGO in the upper left corner; There is the product name: CHARGE4; the middle area is a rendering of the product appearance; there is a Bluetooth logo on the lower left and a 20h battery life logo on the lower right.
There is the JBL brand LOGO on the left side of the back, four product features: 20h battery life, IPX7 waterproof, power bank function, and multiple series connection. On the right side there is the product slogan "PLAY AND CHARGE ENDLESSLY", product name: CHARGE4, and a display of the product's power bank functions.
At the bottom there is some company information, Bluetooth introduction and numerous certification mark information.
There are product appearance renderings and compatibility instructions on the side, and it can wirelessly connect more than 100 JBL Connet+ compatible speakers.
At a glance, the front appearance of the speaker has the JBL brand LOGO.
A look at the back of the speaker. The CHARGE4 product name is printed on the dustproof plug of the charging interface.
The appearance of the bottom of the speaker is at a glance. There are 5 indicator lights. The feet are made of rubber and have a twill anti-slip treatment.
There is the JBL logo on the diaphragm on the side of the speaker.
On the other side is the JBL brand LOGO.
Close-up of the JBL brand LOGO on the speaker.
There is also a Type-C USB cable, safety instructions, quick guide and warranty card in the box.
Close-up of Type-C USB cable.
The JBL brand LOGO is embossed on the USB-A interface.
The USB-A interface of the charging cable adopts a double-sided blind plug design, which can be used regardless of the front or back.
Close-up of Type-C interface, not full of pins.
The wire interface is protected by a thick sealed dust-proof plug, which can achieve a waterproof effect.
The product name: JBL CHARGE4, as well as various certification information and precautions are printed on the back of the cable interface dust plug cover.
The interfaces are Type-C charging interface, 3.5mm audio cable interface and USB power supply port.
The protective rubber on both sides of the speaker is made of translucent material.
I Love Audio Network uses ChargerLAB POWER-Z KT002 portable power tester JBL CHARGE4 to conduct fast charging tests and detects that the USB-A port does not support the fast charging protocol.
I Love Audio Network uses ChargerLAB POWER-Z KM001C to conduct wired charging tests on JBL CHARGE4 Bluetooth speakers. The charging power is about 13.45W.
2. JBL CHARGE4 disassembly
Coming to the disassembly part, first pry open the sound hole cover wrapped in woven mesh cloth in the picture.
Disassembly overview with outer casing removed.
Close-up of the internal structure of the function keys.
Close-up of the inside of the JBL logo.
A front view of the internal cavity of the speaker shows an oval full-range speaker unit.
A look at the back of the speaker's internal cavity. There are cushioning sponge pads around the cavity and at the intersection with the shell.
Close-up of cushioning sponge pad.
The top diaphragm cover is fixed with screws and buckles.
The wire interface cover is fixed to the main body by buckles.
Remove the screws, unlock the buckles, and take off the diaphragm cover units at both ends.
Close-up of the outside of the diaphragm cover.
Both inner end surfaces are low-frequency radiation units.
Looking at the internal structure of the cavity, we first see the two larger sockets on the motherboard. There are screws on the right side of the motherboard. The right socket is connected to the battery, and the left socket is connected to the charge/discharge sub-board.
At the other end of the cavity, you can see the internal structure of the cavity, and you can see the wiring terminals of the full-range speaker unit.
Remove the bottom foot pad cover structure, and the inside is a transparent plastic waterproof shell.
Recycling logo on the inside of the cover, produced in September 2020, made of PC+TPU.
Close-up of the light guide structure of the battery indicator light.
The edge of the cover is wrapped with sponge to improve the waterproof performance.
The cavity is also protected by a transparent cover.
The indicator light plate is fixed on the transparent cover through glue.
There is a cable socket on the back of the small board that is connected to the motherboard. The cable is wrapped in foam to prevent vibration and noise.
Remove the cables and see the transparent cover structure at a glance.
On the back of the small board are the cable interface and the indicator light current-limiting resistor.
There are 6 LED indicators on the front, 5 of the same color are used to display the power, and there is a different color of the Bluetooth connection indicator.
A sealing rubber gasket is provided at the junction between the transparent cover and the casing.
Remove the battery from the cavity.
Both ends of the battery pack are protected by sponge wrapping.
The wires are also wrapped in sponge.
Rechargeable lithium-ion battery pack model: IAA011NA, charging limit voltage: 4.2V, implementation standard: GB 31241-1014, nominal voltage: 3.6V, rated capacity: 7500mAh/27.0Wh, manufacturer: Brocade Energy Systems (Shenzhen) Co., Ltd.
The bottom of the battery pack is covered with sponge pads.
Open the sponge pad and there is a plastic gasket inside to protect it.
Tear off the outer blue protective film to see a close-up of the information on the cylindrical lithium-ion battery.
Tear off the top sponge sticker. The battery pack consists of three 18650 batteries connected in parallel. The nickel sheets are regular and spot welded firmly.
Close-up of the other end.
There is a circuit protection board on the battery pack, and the protection board is covered with foam glue.
Tear off the insulation sticker, and the battery protection plate is fixed inside the plastic insulation bracket. The details are praised.
List of components on the front of the circuit protection board, the output line solder joints are reinforced with glue.
1.5mΩ chip resistor, used for battery output current detection.
Silk screen AJ014 circuit protection IC.
6 NMOS tubes with silk screen printing 4422E for battery protection.
Close-up of the front of the speaker unit.
There is also a rubber seal at the junction between the speaker unit and the cavity.
Overview of speaker appearance.
A close-up of the T-iron speaker with a QR code label attached.
Take out the wire interface unit, and connect the small board to the motherboard through a cable.
Remove the cable and take out the small board. There is a sealed protective cover on the inside of the cover for double-layer protection.
The input panel and cover are fixed by multiple screws.
The upper junction of the cavity is also sealed.
Separate the cover plate and the input plate.
Looking at the front of the input board, there are Type-C charging interface, 3.5mm audio cable interface and USB power supply port soldered through the holes.
There are only through-hole solder joints on the back of the input board.
There is dustproof and waterproof double-sided foam tape for sealing between the cover and the PCB, and the interface is protected by TVS and ESD.
The Type-C charging interface is welded on a separate PCB board.
The function button cushion is fixed with double-sided tape.
Tear off the function button cushions fixed by glue and take a look at the disassembly.
Close-up of the inner structure of the silicone protective pad covering the function keys.
Front view of the function button panel.
Close-up of the jog buttons on the small board.
There are also multiple LED indicators on the small board to provide light sources for the power button and Bluetooth connection button.
Silk screen 2TY transistor.
Close-up of the buffer pad at the junction of component structures.
The front of the motherboard is at a glance, and the edges are protected by sponge pads.
A look at the back of the motherboard, with a large area of ??exposed copper and tin for heat dissipation.
The Bluetooth antenna is connected to the motherboard through a coaxial cable, and the connector is reinforced with glue.
The thin film Bluetooth antenna is from South star, model: CHARGE4-BT.
Two 4R7 filter inductors are used for digital power amplifier output filtering, and the filter capacitor is fixed with white glue.
Close-up of two 1R5 alloy boost inductors.
Two Runshi RS622 low-noise operational amplifiers. The parameters are moderately defined and provide ultra-low input bias current to minimize the impact on the signal source. It is suitable for application scenarios such as audio signal processing, audio signal detection, envelope detection, and motor drive current detection.
Main parameters and characteristics: unity gain bandwidth 7MHz; input offset voltage typical value 0.7mV, can be trimmed to a maximum value of 0.5mV (S622xP series); input bias current as low as 1pA (typical value); Low input noise: 7.5nV Hz@10KHz, 11nV Hz@1KHz; phase margin 62; power consumption per channel as low as 600?A; rail-to-rail input/output; power supply ripple rejection ratio PSRR 93dB; ***mode suppression Ratio CMRR 92dB; slew rate 3.7V/us; operating voltage range 2.5V~5.5V; operating temperature range meets -40 C~125 C.
According to the disassembly of I Love Audio Network, the JBL FLIP5 Music Kaleidoscope Bluetooth speaker also uses this operational amplifier chip.
Runshi RS622 detailed information map.
Silk screen LG and KL3 transistors.
Silk screen UBB IC.
Weimeng D3TG voltage stabilizing IC.
TI Texas Instruments PCM5121 audio stereo DAC with PCM interface and fixed audio processing functions. The PCM512x devices are part of a family of monolithic CMOS integrated circuits consisting of a stereo digital-to-analog converter (DAC) and additional support circuitry that provides a 2.1 VRMS center ground output as well as external mute circuitry.
TI Texas Instruments PCM5121 detailed information map.
A small stamp board is soldered on the motherboard for Bluetooth connection. There are many ICs on the stamp board, and the main control chip has a silk-screen QR code label.
Silk screen SP2 IC.
Silk screen Fb IC.
Silk screen MF IC.
Silk screen 661E01 IC.
Macronix MX25U6435F memory, capacity 8MB, used to store firmware and connection information.
Macronix MX25U6435F details.
Silk screen 9MB IC.
Qualcomm QCC5125 low-power Bluetooth audio SoC supports Bluetooth 5.0 and aptX audio decoding. It has the characteristics of low power consumption and high-quality wireless audio. Designed for mainstream Bluetooth speakers, stereo headphones and true wireless earbuds.
Qualcomm QCC5125 adopts quad-core processor architecture, dual-core 32-bit processor application subsystem; dual-core Qualcomm Kalimba DSP audio, embedded ROM + RAM and external Q-SPI flash memory; supports aptX, aptX HD, aptX adaptive technology; integrated battery charger, supports internal mode (max. 200 mA) and external mode (max. 1.8 A).
Silk screen HY4C transistor.
AWINIC AW9523B LED driver chip, I2C interface, supports 16 channels of breathing lights. The 16 channels of LED are driven by anode constant current, and each channel has a 256-step linear dimming function.
AO3401 PMOS tube.
TI Texas Instruments TPA3128D2 is a dual-channel 30W differential analog input Class D amplifier with low idle power loss, with features to extend battery life of Bluetooth/wireless speakers and other battery-powered audio systems, supports 4.5-26V Operating voltage, supports programmable power limits.
TI Texas Instruments TPA3128D2 detailed information map.
Weimeng S2TG voltage stabilizing IC.
Taiwan Pine ME4435 P-channel logic enhancement power field effect transistor is manufactured using high cell density and DMOS channel technology. Specifically designed to reduce on-resistance and suitable for low voltage applications.
Detailed information map of Taiwan pine ME4435.
MPS MP3431 is a high-efficiency fully integrated synchronous boost chip that powers digital power amplifiers. The maximum output voltage can reach 16V, supports 30W output, and has a maximum peak output of 40W.
MPS MP3431 Details.
SiLijie SY7065A with silk screen VLBUF, a synchronous rectifier boost IC with built-in switching tube, used for USB-A port 5V output.
Silicon SY7065A details.
Silk screen CA4KH IC.
TI Texas Instruments TPS2546 is a USB charging port controller with CDP/SDP automatic switching function and a 2.5A power switch with load detection function for USB-A port output protection.
TI Texas Instruments TPS2546 detailed information map.
MPS MP2624 power management IC is used for built-in battery charging management and supports path management.
MPS MP2624 Details.
JBL CHARGE4 Shockwave Wireless Bluetooth Speaker Teardown Family Photo.
3. Summary of I Love Audio Network
The appearance design of JBL CHARGE4 wireless Bluetooth speakers still continues the design of the previous generation and inherits the family-style design language. It has a cylindrical appearance, is wrapped in a large area of ??woven mesh, and has a horizontal vertical design. There are radiating diaphragms on the left and right sides, and there is JBL's iconic LOGO on the diaphragm. The overall look and feel is relatively simple and highly recognizable. The many colors available enrich the personalized options of this product.
In terms of internal structure configuration, the workmanship is excellent and the details are in place. The components are connected through sockets, and the junctions of the cavities are cushioned and protected by sealant pads. The configuration uses a speaker unit with a maximum output power of 30W, paired with two left and right low-frequency radiating diaphragm units to enhance the sense of low-frequency volume; it is also equipped with Texas Instruments TPA3128D2 Class D amplifier and PCM5121 audio digital processor, as well as two minimizing interference to the signal source. The impact of the Runshi RS622 low-noise operational amplifier effectively ensures sound quality.
The charging interface has been replaced from the previous generation Micro-USB to Type-C, and the battery capacity has been increased to 7500mAh, providing the speaker with a long-lasting battery life of up to 20 hours; the battery is equipped with a circuit protection board, which is fixed on plastic insulation. Inside the bracket, there are circuit protection ICs and NMOS tubes on the protection board; it is also equipped with a USB-A interface that supports the power bank function and can be used for emergency charging of mobile devices such as mobile phones and tablets.
The main control chip uses Qualcomm QCC5125 low-power Bluetooth audio SOC, supports Bluetooth 5.0, has the characteristics of low power consumption, high-quality wireless audio, etc.; MPS MP3431 high-efficiency fully integrated synchronous boost chip, for Digital power amplifier power supply; Silicon Power SY7065A synchronous rectifier boost IC for USB-A port 5V output; TI Texas Instruments TPS2546 USB charging port controller for USB-A port output protection; MPS MP2624 power management IC for built-in battery Charging management; and Macronix MX25U6435F memory, Awinic AW9523B LED driver, Songmu ME4435 P-channel logic enhanced power field effect transistor, etc.