We are a professional audio company integrating R&D, production and sales. We have been focusing on the production of mixers, active power amplifiers, microphones, and related electronic components and equipment for many years.
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Precipitation of more than 20 years of technical design
OEM / ODM /B2B
24-hour one-stop service
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We have a strong R & D team that can develop and produce products according to the drawings or samples provided by customers.
We have two own foundries and processing factories, factory direct sales, high quality and low price.
We have our own laboratory and advanced testing equipment in the industry to ensure product quality.
Based on the high-grade and high-end market, our products meet international standards and are mainly exported to Europe, America, Japan and other countries.
1. The synergy of power amplification and low-frequency enhancementThe basis for the subwoofer power amplifier module to achieve low-frequency effects lies in its multi-stage amplification architecture. The input stage uses an operational amplifier to preliminarily amplify the weak audio signal, while completing impedance matching and signal buffering. The voltage amplifier stage is responsible for boosting the signal to a level sufficient to drive the power output stage. This stage usually adopts class AB or class D amplification design to improve efficiency while ensuring sound quality. The power output stage is the core part. High-power transistors or MOSFET tubes amplify the signal to tens of watts or even thousands of watts to drive the subwoofer speaker unit. This hierarchical amplification design ensures that the signal maintains high fidelity throughout the transmission link while providing sufficient energy reserves. The low-frequency management circuit is the key to improving the bass effect. A good subwoofer amplifier module has a built-in adjustable low-pass filter, and the frequency cutoff point is usually in the range of 40Hz-200Hz. The phase adjustment function ensures that the sound waves of the subwoofer and the main speaker arrive at the listening position synchronously to avoid low-frequency attenuation caused by phase cancellation. Some high-end modules are also equipped with low-frequency enhancement circuits, which intelligently improve the response of specific frequency bands through dynamic equalization technology, and enhance the bass impact without distortion. The synergy of these processing technologies makes the low-frequency performance both deep and powerful, and clear and controllable. 2. Efficient amplification technology and thermal management innovationThe second technical pillar for the subwoofer power amplifier module to achieve high performance lies in the optimization of its amplification category selection. Although the traditional class AB amplifier has good sound quality, its efficiency is only 50-60%. Modern subwoofer modules are increasingly using class D digital amplification technology, which can reach an efficiency of more than 90%, suitable for high-power low-frequency applications. Class D amplifiers convert audio signals into high-frequency switching signals through pulse width modulation (PWM), and after power amplification, they are restored to analog signals through filters to drive speakers. This technology not only reduces energy consumption and heat generation, but also provides cleaner and more controlled low-frequency response. Thermal management design affects the reliability and continuous output capacity of the amplifier module. The aluminum alloy heat sink efficiently dissipates the heat generated by the power tube through a precisely calculated thermal channel design. The thermal protection circuit monitors the temperature of key points in real time, and automatically reduces the output power or starts the protection shutdown when the risk of overheating is detected to prevent device damage. Good thermal design enables the amplifier module to continuously output the rated power for a long time, and even withstand 2-3 times the peak power for a short time to meet the needs of dynamic low frequency. 3. Digital processing and intelligent controlThe performance of modern subwoofer power amplifier modules also benefits from the improvement of their digital signal processing capabilities. The built-in DSP chip realizes advanced processing functions such as parameter equalization, dynamic compression, and limiter protection. The intelligent control interface enhances the convenience of use. The trigger input/output terminal realizes linkage control with other audio equipment, and the 12V trigger or audio signal sensing power-on function makes the system operation more intelligent. Multiple mode operation designs meet the needs of different application scenarios. The music mode optimizes transient response and bass elasticity, which is suitable for enjoying music; the movie mode enhances the extension and impact of the ultra-low frequency, and reproduces the explosion and special effects sound in the movie; the night mode compresses the dynamic range to maintain clear low-frequency details at a lower volume. These preset modes can be switched with one click to quickly adapt to different listening needs, giving full play to the advantages of the subwoofer in various scenarios.
1. Distortion (THD/THD+N)Total harmonic distortion (THD): The sound system amplifier will generate harmonics (such as 2f, 3f, etc.) outside the original signal due to nonlinear elements (such as transistors), resulting in a "burr" sound. Impact --When THD>0.1%, the human ear can perceive distortion, such as hoarseness of the human voice and loss of overtones of musical instruments; high-end Hi-Fi amplifiers need THD <0.01%.THD+N (Total Harmonic Distortion + Noise): The circuit background noise is superimposed, which more truly reflects the actual listening experience. For example, THD+N may soar at high gain, resulting in an unclean background. 2. Signal-to-noise ratio (SNR): Determines the purity of the backgroundDefinition: The power ratio of the useful signal to the background noise (unit: dB).Impact --SNR < 90dB: Noise (such as "rustling") can be heard in quiet passages, and dynamic compression;SNR > 110dB: The background is like a "black curtain", and the details of weak sounds are clear (such as breathing and bow rubbing strings).Optimization direction: Power supply filtering and low-noise components (such as JFET input stage) can improve SNR. 3. Output power and dynamic rangeRated power: It is necessary to match the speaker sensitivity (such as 84dB speakers need > 50W, 90dB only needs 20W), avoid under-pushing (weak sound) or overload (burning the speaker). 4. Other factorsPower supply rejection ratio (PSRR): Suppress power supply ripple interference, PSRR > 80dB can avoid "hum".Transient response (Slew Rate): The rate of voltage change per unit time (V/μs). When <10V/μs, high-frequency transient distortion occurs (such as the cymbal's cracking becomes dull).Temperature stability: Class A amplifiers drift at high temperatures, causing crossover distortion (intermediate frequency breakage).
The DSP24/DSP25 Series Active Speaker Amplifier is an advanced audio device that integrates digital signal processing (DSP) and power amplification. It provides precise audio control and high-efficiency output for professional audio systems through intelligent algorithms and high-precision hardware architecture. This series of products is mainly aimed at scenarios such as line array speakers and performance systems, and achieves optimization from sound source processing to power drive through modular design. On the technical level, the DSP24/DSP25 series uses ARM processors and AD/DA converters to support high-fidelity signal processing with 24-bit depth and 96kHz sampling rate. The input channel is equipped with noise gate, gain control, phase correction and 31-band parametric equalization, while the output channel integrates crossover, compressor, delay controller and 10-band parametric equalization. The crossover point can be freely adjusted in the full frequency band and supports multiple filter types. The power amplifier module of the product adopts Class D digital amplifier technology, with a single-channel output of up to 800W (8Ω load), and with an ultra-low distortion PWM modulator, the damping coefficient exceeds 350, ensuring a clean and powerful low-frequency response. Its dual feedback design not only improves energy efficiency (peak efficiency > 90%), but also ensures equipment stability through multiple protection mechanisms such as temperature, overload, and DC. For complex acoustic environments, its compressor can dynamically adjust the attack/release time to prevent transient signal overload, and the delay controller supports a 25ms adjustment range, effectively solving the sound field synchronization problem of multi-channel systems.
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+86-18815298889
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+86-574-87781767
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+86-574-87787735
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Xiyun Road, Xiepu, Zhenhai, Ningbo, Zhejiang, China
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