2026 GETshow Exhibitor Recommendation | Electrical Principles, Manufacturing Techniques & Production Process of Power Amplifiers for Sound Reinforcers (Visit & Experience at Booth 1.1E4, Zone A)

2026 GETshow Exhibitor Recommendation | Electrical Principles, Manufacturing Techniques & Production Process of Power Amplifiers for Sound Reinforcers (Visit & Experience at Booth 1.1E4, Zone A)

As a core high sound pressure level acoustic device for emergency broadcasting, coastal defense early warning, industrial alarms and other scenarios, a high-power loudspeaker requires its supporting power amplifier to simultaneously meet three critical demands: extreme environmental adaptability, precise driving in core frequency bands, and high reliability. Based on an integrated protection architecture featuring seven defenses (fireproof, dustproof, waterproof, moisture-proof, mildew-proof, salt-fog proof and corrosion-proof), this paper takes the specialized power amplifier for high-power loudspeakers under the Tiansheng Zhihui brand, independently developed by Guangzhou Tiansheng Audio Technology Co., Ltd., as the research object. It systematically elaborates on its modular hardware system, full-link electrical principles, professional manufacturing techniques and standardized production process.

Field tests verify that the amplifier can stably drive loads from 2Ω to 16Ω in a wide temperature range of -40°C to +85°C. The total harmonic distortion (THD) in the core frequency band of 500 Hz–18 kHz is below 1%, and the power conversion efficiency theoretically reaches over 93% with zero conduction loss. Featuring industrial-grade stability and environmental durability, it provides an efficient, safe and standardized high-intensity acoustic driving solution for harsh working conditions such as emergency security, coastal defense ports, mines and industrial plants.

Introduction

In complex industrial and outdoor scenarios such as coastal defense, mining, emergency disaster prevention, and port scheduling, high-power loudspeakers perform the core functions of long-distance, high-penetration, all-weather voice broadcasting and safety early warning. Traditional general-purpose power amplifiers suffer from insufficient protection levels, poor frequency band matching, weak heat dissipation design, and incomplete protection mechanisms. In extreme environments with high humidity, high salt spray, heavy dust, and wide temperature fluctuations, they are prone to performance degradation, malfunctions, shutdowns, and even load damage, failing to meet the requirements for long-term, continuous, and reliable operation. To address these industry pain points, Guangzhou Tiansheng Audio Technology Co., Ltd., relying on its accumulation of acoustic and electronic engineering technologies, has independently designed and developed a dedicated Class-D power amplifier for high-power loudspeakers. Based on an industrial-grade seven-protection design, the product optimizes the circuit topology for the core 500Hz–18kHz sound emission band of high-power loudspeakers. It integrates modules including intelligent power management, IP network audio processing, professional electronic crossover, high-power Class-D amplification, and multi-dimensional intelligent protection, forming a closed-loop system architecture of protection–processing–amplification–protection–drive. This paper comprehensively analyzes the design logic, engineering implementation, and application value of this dedicated power amplifier from five dimensions: system architecture, electrical principles, manufacturing technology, production process, and performance verification.

Overall System Architecture and Seven-Proof Protection Design

2.1 Modular System Topology

The dedicated power amplifier for high-power loudspeakers adopts a layered, modular, highly integrated and highly reliable design. All functional units work in coordination to achieve lossless, efficient and stable transmission of audio signals from input to drive. The overall system consists of seven core modules:

1. Power Supply and Management Module: Provides wide-voltage input, multi-channel isolated voltage regulation and power protection; 2. IP Network Audio Processing Module: Enables reception, decoding and remote control of TCP/IP digital audio streams; 3. Preamplifier Signal Processing Module: Performs signal amplification, gain adjustment, impedance matching and noise suppression; 4. Professional Electronic Crossover Module: Precisely locks the effective frequency band of 500Hz–18kHz and filters out spurious interference; 5. Class-D Power Amplification Module: Achieves high-efficiency, high-power audio signal amplification; 6. Power Crossover and Output Drive Module: Optimizes output characteristics and directly matches high-power loudspeaker loads; 7. Intelligent Protection and Control Module: Monitors the overall status in real time and provides full-dimensional safety protection.

2.2 Design and Implementation of the Seven-Proof Protection System

To meet the requirements for use in extreme environments such as outdoor areas, coastal defense, and mines, the power amplifier establishes a seven-proof protection system from four aspects: electrical insulation, structural sealing, material selection, and process treatment.

1. Electrical Protection: The core PCB is fully coated with three-proof insulating varnish, providing moisture resistance, mildew resistance, and salt-fog resistance. The power circuit uses thickened copper foil and corrosion-resistant plating to reduce contact resistance and leakage risks. Key areas are potted and cured with high-thermal-conductivity, high-temperature-resistant, V0-grade flame-retardant potting compound to enhance insulation strength and impact resistance.

2. Structural Protection: The whole machine adopts a sealed anodized aluminum alloy explosion-proof enclosure, equipped with industrial-grade waterproof aviation connectors, achieving an overall protection rating of IP68 or higher. Both the casing and internal structural parts are made of high-temperature-resistant and flame-retardant materials, realizing integrated fireproof, dustproof, and waterproof protection.

3.Environmental Adaptation: Core components are automotive-grade/industrial-grade wide-temperature devices, with an operating temperature range of -40°C to +85°C. Heat dissipation paths are optimized through thermal simulation, adopting high thermal conductivity radiators and an intelligent temperature-controlled cooling scheme to ensure stable and undegraded performance in wide-temperature environments.

Electrical Principles and Core Module Design

3.1 Power Supply and Intelligent Management System

The power amplifier adopts a main‑auxiliary separated, wide‑voltage adaptive, and graded isolated power supply architecture to ensure stable operation and expansion capability of the whole system: 1. Main Power System: Supports 12V/24V/36V/48V DC wide‑voltage input, which is converted by a high‑efficiency switching power supply into 5V and 12V low‑voltage logic power supplies and ±48V power‑stage dual power supplies, supplying power to control circuits, network modules, and power amplification units respectively. 2. Auxiliary Power System: Configurable 12V/24V/36V/48V DC output for driving external devices such as warning lights and sound‑light alarms, realizing sound‑light linkage early warning. 3. Power Protection Circuit: Integrates over‑voltage, under‑voltage, over‑current, reverse‑connection, and surge suppression protection functions, cutting off abnormal power supply with millisecond‑level response to avoid damage to equipment and loads.

3.2 Signal Input, Processing and Electronic Crossover

The power amplifier supports dual input of IP network and analog signals, with intelligent priority switching: 1. Signal Input and Switching: The network port receives remote digital audio based on TCP/IP protocol, supporting remote centralized management and cross‑regional broadcasting; analog line interfaces are compatible with traditional broadcasting systems; IP signals are automatically switched with priority in emergency states to ensure priority command delivery. 2. Preamplification and Impedance Matching: Performs low‑noise amplification on weak signals, completes impedance matching and signal‑to‑noise ratio optimization, providing a pure signal source for the rear stage. 3. Professional Electronic Crossover: Adopts high‑precision active filter circuits to accurately extract the 500Hz–18kHz core sound frequency band of high‑power loudspeakers, filter out invalid low‑frequency and high‑frequency interference, reduce useless power consumption, and improve sound propagation distance and clarity.

3.3 PWM Modulation and Class‑D Power Amplification Principle

The power amplifier adopts a digital PWM modulation + full‑bridge Class‑D power amplification architecture to achieve high efficiency, low heat generation, and high power output: 1. PWM Modulation: Converts analog audio signals into high‑speed pulse width modulation signals, realizing digital power control. 2. Class‑D Power Amplification: Adopts BTL bridge‑connected output structure, which improves efficiency by more than 30% compared with traditional Class‑AB amplifiers, with overall efficiency up to 93%, greatly reducing heat generation and energy consumption, supporting 7×24 hours of continuous full‑load operation. 3. EMI Suppression: Suppresses PWM switching interference through multi‑stage LC filtering, metal shielding isolation, and grounding optimization, meeting industrial‑grade EMC standards without affecting surrounding communication and control equipment.

3.4 Output Drive, Load Adaptation and Intelligent Protection

1. Output Drive: Adopts balanced OUT+ and OUT‑ direct drive mode, without loss from transformers and DC blocking capacitors, providing stronger driving capability. 2. Wide Load Adaptation: Supports full‑range impedance adaptation from 2Ω to 16Ω, compatible with various high‑power loudspeaker units and multi‑speaker parallel connection scenarios. 3. Multi‑dimensional Intelligent Protection: Integrates DC protection, short‑circuit protection, overload protection, over‑temperature protection, frequency band protection, and load abnormality protection, monitoring output status in real time and immediately shutting down output when abnormalities occur, fundamentally avoiding damage to loudspeaker units.

3.5 AFC Automatic Frequency Control Technology

Built‑in AFC digital automatic frequency control module calibrates output frequency in real time through closed‑loop feedback, offsetting frequency drift caused by temperature and voltage fluctuations, ensuring stable sound production and clear voice of high‑power loudspeakers, and improving the reliability of long‑distance broadcasting.

Professional Manufacturing Technology

The specialized power amplifier for high-power loudspeakers adopts high-standard industrial-grade manufacturing processes, with emphasis on environmental adaptability, high reliability and long service life design.

1. PCB Technology: Adopts 4–6 layer industrial-grade thick-copper PCB with strict separation of power, signal and ground layers. Large-current loops use widened traces and large-area copper paving to reduce temperature rise and interference.

2. Component Selection: All components are industrial-grade / automotive-grade wide-temperature devices. Power MOS tubes, capacitors and resistors all meet the operating requirements of -40°C ~ +85°C. Key components adopt derating design to improve long-term reliability.

3. Soldering Technology: Combines SMT mounting and DIP through-hole technology, using nitrogen reflow soldering and selective wave soldering to ensure solder joint consistency and reliability. High-current terminals are reinforced with tinning treatment.

4. Three-Proof and Potting Technology: The entire PCB is coated with three-proof insulating varnish. Power and power areas are fully sealed with high-thermal-conductivity, high-temperature-resistant and flame-retardant potting compound to improve moisture resistance, salt-fog resistance and vibration resistance.

5. Heat Dissipation and Structural Technology: Adopts high-purity aluminum alloy heat sink, combined with thermal grease and uniform fastening process. The whole machine is assembled in a sealed way, with multiple protections including waterproof rubber rings, waterproof connectors and sealant, reaching a protection grade above IP68.

Standardized Production Process

To ensure product consistency and reliability, Tiansheng Zhihui's specialized power amplifiers for high-power loudspeakers implement full-process standardized production control as follows: 1. Pre-production Preparation: BOM verification, IQC incoming inspection of components, PCB electrical performance testing, tooling fixture and program debugging.

2. SMT Mounting: Solder paste printing → high-speed mounting → reflow soldering → AOI optical inspection to ensure mounting accuracy and solder joint quality.

3. DIP Plug-in & Soldering: Plug-in of high-power devices, inductors, sockets, radiators, etc. → wave soldering / manual soldering → pin cutting → cleaning.

4. Three-Proof Coating & Potting Curing: PCB three-proof paint spraying → drying and curing → potting compound application in designated areas → room temperature / oven curing.

5. Structural Assembly: Heatsink installation → chassis assembly → waterproof connector and seal installation → overall fastening and appearance inspection.

6. Electrical Performance Testing: Static testing (voltage, current, midpoint potential) → dynamic testing (power, frequency response, distortion, efficiency) → protection function testing (short circuit, overload, over-temperature, DC).

7. High-Temperature Full-Load Aging: Continuous full-power aging of the complete unit at 45°C–55°C for 8–24 hours to eliminate early failure products.

8. nvironmental & Reliability Testing: Sampling verification of high-low temperature cycling, vibration, waterproof and salt-fog adaptability.

9. Final Inspection, Marking & Packaging: Full-function re-inspection → appearance inspection → laser marking → waterproof and moisture-proof packaging → warehousing.

Performance Verification and Application Scenarios

6.1 Core Performance Index Verification Measured by third-party laboratories and internal tests, the core performance of the Tiansheng Zhihui dedicated power amplifier for high-power loudspeakers is as follows:

- Operating temperature: -40°C ~ +85°C, up to 105°C - Load adaptation: 2Ω ~ 16Ω - Operating frequency band: 500Hz ~ 18kHz - Total harmonic distortion (THD): < 1% - Power conversion efficiency: ≥ 93% - Protection grade: IP68 and above - Continuous operating time: Stable 7×24-hour operation - Protection mechanism: Full-dimensional intelligent protection, no damage to loudspeakers or amplifiers 6.2 Typical Application Scenarios With excellent environmental adaptability and reliability, the product is widely used in: 1. Emergency broadcasting systems: Early warning of natural disasters such as earthquakes, floods and typhoons, and personnel evacuation command; 2. Coastal defense and port systems: Scheduling broadcasting and safety early warning in high-salt-fog environments of coasts and docks; 3. Industrial alarm systems: Fault alarms and danger warnings in mines, chemical plants and industrial parks; 4. Outdoor public publicity: Disaster prevention publicity and policy broadcasting in mountainous areas, forest areas and remote towns.

Based on a seven-proof protection architecture and centered on precise matching with the core frequency band of high-power loudspeakers, the dedicated power amplifier for high-power loudspeakers under the Tiansheng Zhihui brand, developed by GUANGZHOU DX-AUDIO CO.,LTD, integrates intelligent power management, IP network audio processing, high-efficiency Class-D amplification, full-dimensional intelligent protection, as well as professional manufacturing techniques and production processes, forming a complete, reliable high-intensity acoustic drive system adapted to extreme environments. The product exhibits excellent stability and durability under harsh working conditions such as wide temperature ranges, high humidity, high salt spray, and heavy dust, effectively enhancing the overall reliability and service life of emergency broadcasting, coastal defense early warning, and industrial alarm systems. In the future, the product will further integrate intelligent technologies including AI intelligent noise reduction, adaptive frequency band optimization, IoT remote monitoring, and proactive fault early warning, continuously improving the automation, networking, and intelligence levels of the equipment, and providing more advanced and reliable professional audio drive solutions for public safety, industrial security, and coastal defense early warning fields. Design Unit: GUANGZHOU DX-AUDIO CO.,LTD

Brand Name: Tiansheng Zhihui                            

                      Source: DX-AUDIO