4.2P SP overall description

The built-in MC booster of 4.2P SP is based on OPA2277 design, which aims to solve the low-frequency interference and low-frequency dynamic problems during vinyl playback, which is a technical challenge in the industry. All channels of the system use OPA1602, which not only takes into account the base quality of the sound, but also maintains reasonable technical indicators. The load of the cartridge, whether MC or MM type, can be adjusted independently, which provides users with flexible choices.

In terms of circuit design, 4.2P SP uses RAII circuit, which excludes feedback mode and uses advanced attenuation mode network instead. Such a design relies particularly on customized capacitor and resistor components, because the attenuation design does not have dynamic compression compared to the feedback design, and the accuracy of the RAII curve requires high accuracy of components.

In addition, the built-in crossover uses the crossover circuit technology developed specifically for high-end models, which is not only designed to improve the sound quality, but also considers the needs of different application scenarios. Especially for the use environment in Hong Kong, this device has added a parametric volume adjustment function, and each EQ frequency point has four optional frequencies and adjustable Q value, which allows users to make fine adjustments according to specific needs.

In order to meet the needs of low volume at night, the device has a special four-band frequency curve adjustment function and has the choice of low-frequency boost and attenuation. Although these professional adjustments seem complicated, the design team considers the user’s convenience and provides a number of default settings to facilitate users to quickly get started.

The power amplifier circuit of 4.2P SP has been developed for ten years and uses Class D technology, which makes its tone very close to that of Class A amplifiers, providing a high-quality audio experience. From the perspective of appearance design, this speaker is also eye-catching. The use of hexagonal gold gong wire adds a sense of luxury, while the design of highlighting the gong wire creates a strong sense of power, and the open paint process of rosewood veneer leaves a deep impression visually.

In terms of speakers, 4.2P SP uses products specially customized for it by the Danish brand Wavecor. The voice coil design of the 22mm tweeter has been optimized, with an aluminum magnetic field stabilization ring to reduce distortion, and the use of copper-clad aluminum coils improves efficiency and dynamic performance. In addition, the special cavity design further reduces distortion, while the progressive basin frame structure enhances durability. The introduction of the CONEX cross-axis shock absorber improves the stability of the device under extreme working conditions, which allows the device to still have excellent listening effects in a larger space without being placed close to the wall.

In terms of wireless connection, the 4.2P SP not only focuses on vinyl playback, but also takes into account modern trends and supports the highest quality 5.0BT lossless audio solutions. Gedun Electronics is uncompromising in its pursuit of sound quality. All audio wiring is customized wire from professional German manufacturers, and the power wire uses the Gaofen top-class wire base imported from Switzerland.

All functions can be controlled through a dedicated mobile phone app, which makes the user operation convenient, intuitive and high-end. This design not only meets the needs of high-end audio enthusiasts, but also provides modern user experience, whether in sound quality, appearance or ease of operation.

4.2P SP circuit design details

The built-in high-power 250W high-efficiency toroidal transformer is an efficient audio system that integrates a variety of advanced audio technologies. The system not only supports remote control by smartphone applications, but also has high-resolution Bluetooth 5.0 APTX-HD audio transmission function, which makes audio transmission more stable and of higher quality.

In terms of audio processing, this device uses ROHM advanced audio technology, which is capable of various audio processing and has a low-noise MM/MC phono preamplifier. This means that users can choose the appropriate cartridge and perform impedance matching according to their needs, which is essential for high-quality music playback.

The recording-level parametric equalizer adjustment setting of the device is very flexible, providing three adjustable parameters, including variability of frequency and Q value, which provides music lovers with great flexibility to adjust the sound quality.

In terms of bass output, the system has a high-efficiency ultra-low distortion Class D power amplifier and an ultra-low distortion operational amplifier OPA1602, which ensures the clarity and accuracy of the sound quality. Its precise two-way electronic crossover design and treble delay circuit further enhance the performance of the audio.

The circuit board of the device uses a four-layer high-current design, which not only improves stability but also enhances the overall performance of the audio. It is equipped with advanced speaker units tailored for ADON by Wavecor in Europe, which makes the audio system more advantageous in terms of sound quality.

In terms of appearance, this audio system uses real solid wood skin, showing a gorgeous and elegant style. Its power input is AC120V/60Hz; or AC220V/50Hz, and the power consumption of the whole machine is 500W, which enables it to provide high power while maintaining a good energy efficiency ratio.

In terms of technical specifications, the high-frequency unit of the audio system is 104mm, and the low-frequency unit is 118mm, both of which are 4-ohm configurations. The bass adjustment range is +2/-4dB, and the adjustment range of the midrange and treble is the same. This design allows users to adjust according to different music styles.

In terms of output performance, the bass output reaches 282W (100Hz/40/10%), and the treble output is 215W (10KHz/40/10%). The distortion is only 0.005% (100Hz/40/10W), and the signal-to-noise ratio reaches -90dB, which undoubtedly shows its excellent sound quality performance. The separation is -80dB, the output noise is 0.4mV, the input sensitivity is 600mV, and the maximum peak reaches 2600mV. The gain of the MM cartridge is 60dB, and the gain of the MC cartridge is 79dB, which further emphasizes its pursuit of sound quality.

Overall, this external high-power 250W high-efficiency toroidal transformer is undoubtedly a sound system suitable for music lovers and professional users with its multi-functional, low-distortion and high-efficiency design.