Recently, news about ZTE’s sanctions by the United States is endless. The United States’ restrictions on the export of important chips just hold the throat of ZTE’s fate. Although ZTE has stated that it has used a large number of special chips developed and designed by itself in the core components of its main products, a large number of General-purpose devices are inevitable outsourcing. The information industry is the most open industry in the world. No country can complete all the industrial chains independently. Although the United States is in a leading position, American companies also inevitably need a global industrial chain.

On the other hand, the situation of our audio industry is quite similar. Since audiophiles entered the country, local audio manufacturers have faced the pressure of competition from foreign brands. As the layout of the global supply chain has gradually penetrated, foreign brands have moved their production bases to the country. , Costs continue to decrease, but profits continue to grow. In the past ten years or so, Chinese brand Hi-Fi manufacturers have been declining their market share in stereo speakers or home theaters, and the road to high-end development is even more difficult. Many domestic audio manufacturers rely on OEM and ODM orders to maintain. Although many European and American brand products are already Chinese ODM, the high-quality components used in domestically produced audio products are all purchased from foreign countries, and many of them are first selected by European and American manufacturers and left behind after matching. Therefore, whether domestic audio brands can use high-quality components designed and produced in China is also worthy of our attention.

Shengya, known as the "Voice of China"

The latest CS-6 pre-amplifier and PSD-650 post-amplifier from Shengya, known as "Sound Zhengya", sent to the audition room of our magazine. Zhongshan Shengya Audio Appliance Co., Ltd. was established in 1991 and has been focusing on Hi-Fi pure two-channel series products. As one of the representatives of China's premium audio brands, Shengya is not only the pride of my country's audio industry, but also one of the few "created in China" international brands in the overseas market. Over the years, Shengya has become the guarantee of product quality with its creative and stable exterior craftsmanship, rigorous and neat internal design, and mature and precise circuit structure, thus winning the market, obtaining full affirmation from the industry, and being widely used by fever users Praise.

Among the products of Shengya, CD players and amplifiers are the most famous, and amplifiers have become the pillars and benchmarks of Shengya’s brand image. Many models have even become classics and are talked about by audio enthusiasts. Ya still continues to introduce, improve and evolve its amplifier product model line with its strong development attitude and advanced technical strength, providing users of different levels with complete matching options. We can see that in addition to Zhenshan's front and rear split fully balanced amplifiers, the combined power amplifier is the backbone of the market and has become a popular choice for many philharmonic users. The CS-3.5 pre-amplifier and PSD-350 stereo post-amplifier launched a few years ago are even more sought after by enthusiasts. Coming to 2018, Shengya launched the CS-6 flagship gallstone hybrid preamp and PSD-650 fully balanced high-power Class A stereo post stage, giving users more choices.

Among the products of Shengya, CD players and amplifiers are the most famous, and amplifiers have become the pillars and benchmarks of Shengya’s brand image. Many models have even become classics and are talked about by audio enthusiasts. Ya still continues to introduce, improve and evolve its amplifier product model line with its strong development attitude and advanced technical strength, providing users of different levels with complete matching options. We can see that in addition to Zhenshan's front and rear split fully balanced amplifiers, the combined power amplifier is the backbone of the market and has become a popular choice for many philharmonic users. The CS-3.5 pre-amplifier and PSD-350 stereo post-amplifier launched a few years ago are even more sought after by enthusiasts. Coming to 2018, Shengya launched the CS-6 flagship gallstone hybrid preamp and PSD-650 fully balanced high-power Class A stereo post stage, giving users more choices.

CS-6 flagship gallstone mixed preamp

Shengya CS-6 flagship gallstone hybrid preamplifier still continues the design of Shengya's high-end products, inheriting the black aesthetics of Shengya, and the power remains the same. Only the front two support columns and the knob ring are silver, and the front control panel is made of wire drawing. The appearance of the whole machine is quite elegant and simple, and the huge volume also shows its atmospheric and heavy style. Take a closer look at its workmanship. The techniques and techniques are all in love with me. The front stage is more sensitive to mechanical vibration, so in the design of the CS-6 front stage chassis, Shengya uses the silver support column behind the hidden panel and the rear support foot to form a very stable three-point support structure, plus a thick chassis. It constitutes a mechanical load-bearing structure with strong damping performance.

1. Get multiple systems in one machine

On the front panel, the front panel is still the previous design of Shengya. In addition to two huge knobs for selecting control volume and input selection, the factory also specially set up a row of LED status indicators to let you know the current input clearly. The location of the channel. The interface on the back of the machine also shows the flagship's momentum. The factory knows that many players have several different sets of audio equipment, so it has set up 5 sets of RCA input and 1 set of XLR input, which can be described as a player with more sources. Gospel. In terms of output, 2 sets of RCA output and 2 sets of XLR output are set up for the first time. For players who play bi-amps or even multiple sets of rear stages, they can catch them all at one go. Just connect the CS-6 flagship gallstone hybrid front stage. .

2. The power supply part cannot be ignored

Some time ago, I played with a lot of front-ends, and I know the importance of power to the front-ends. Therefore, we start from the power supply section. Although the CS-6 flagship gallstone hybrid pre-stage does not use a split power supply design, each channel uses an R-shaped power transformer. The transformer is placed in a special shielded box. The "box in the box" structure can prevent electromagnetic interference to the audio circuit. At the same time, the transformer with the greatest vibration is isolated as a whole and installed directly on the side of the box. The rectification, filtering, and voltage stabilization circuits are also two sets that do not interfere with each other, and the parallel precision voltage stabilized power supply design is adopted to effectively reduce the dynamic crosstalk interference and make the sound reach the highest level.

3. The design materials are unambiguous

The audio circuit of CS-6 adopts the advanced design of dual mono full balanced amplifier circuit, and the two channels are designed independently. The potentiometer used by the CS-6 is a Japanese-made ALPS large quadruple high-precision potentiometer, which has small channel error, long life, and low signal distortion. It can be remotely controlled, which makes users feel more convenient. In addition, various top-level components can be seen on the circuit board, such as MKP audio special film electrodeless capacitors, Wima capacitors, 1% high-precision metal film resistors, etc., which lay a solid foundation for excellent sound performance.

4. The rare mixed pre-stage design of gallstones

The core of the pre-amplifier part is developed for the accumulation of many years of experience. The DC-combined gallstone hybrid amplifier circuit adopts a fully discrete circuit design and cooperates with an electronic tube class A output buffer with up to 30V undistorted output voltage, allowing you to experience unprecedented The gallstones mix the ultimate sound. The tube buffer part uses 8 enthusiast ECC88 tubes made in Slovakia and a fully gold-plated tube base, which improves the sound performance and can easily match any post-amplifier.

PSD-650 fully balanced high power Class A stereo rear stage

The PSD-650 fully-balanced high-power Class A stereo rear amplifier was sent to this journal together with Shengya CS-6 flagship gallstone hybrid preamplifier. The PSD-650 rear amplifier was exhibited at the Guangzhou International Audio Record Exhibition (East It has been shown at the hotel exhibition), and we have also experienced its charm. The PSD-650 rear stage has a similar appearance to previous Shengya rear-stage products, with a meter in the middle, and the power switch, input selection switch, mode switch, etc. below. Therefore, the author believes that the front and rear products of different levels of Shengya can be used universally. In addition to having the same appearance and love, the sound destination is also quite similar, so you can play high-end games such as bi-amp.

1. Heavyweight power blessing

As a dual-channel power amplifier, its body has a depth of 658mm and a weight of 80kg, which is really amazing. Three male colleagues in the office can unpack and move it. Why is the PSD-650 rear stage so heavy? The power supply part uses a 3000W toroidal transformer, which is quite a huge transformer. Although the whole machine is only equipped with a power transformer, the power of the left and right channels is separated and divided into four separate AC power windings and bridges. The rectifier, combined with electrolytic capacitors with a capacity of up to 240,000μF, ensures that the whole machine is continuously surging power and can also minimize the dynamic crosstalk between the two channels.

2. 48 high-power transistors provide surging thrust

The audio signal input circuit of the rear stage of PSD-650 is composed of FETs and bipolar transistors for common-source common-base differential amplification. This part adopts enthusiast-grade famous transistors, and the final stage of amplification uses 48 high-power transistors. PSD-650 has a huge 50W×2 (8Ω) class A power and 550W×2 (8Ω), 1100W×2 (4Ω) class AB power output, even under extreme conditions (such as when it drops to 2Ω) , PSD-650 can be easily controlled, so for most speakers on the market, PSD-650 post-amp is not difficult.

3. Unique dynamic class A technology

It is worth mentioning that the Class A switch of the PSD-650 rear stage is different from the previous Shengya rear stage which directly selects the A or AB working state. The PSD-650 is a dynamic Class A switch. What is dynamic type A? When the dynamic type A switch is turned on, the related circuit will detect the status of the machine. When the output audio voltage of the machine is greater than 1.5V (0.3W/8Ω), the subsequent stage will automatically switch to the type A state. At this time, the meter of the machine The pointer will move to the vertical position; when there is no audio signal or the output audio voltage is greater than 1.5V (0.3W/8Ω), the machine will work in the AB state, and the pointer will return to the initial position.

The design concept of dynamic class A circuit technology comes from the more advanced mono models of Shengya. The mono models PSM-500 and PSM-300 that we have seen before can choose the working mode of class A or class AB. Since PSM-500 and PSM-300 are in Class A working state, the heat of the chassis will be very high, and the power consumption will increase accordingly; especially on hot days, if the room does not have air conditioning, it is really uncomfortable; at the same time, in view of the product It is also exported to foreign countries. The foreign entry system and consumers have higher requirements for energy conservation and environmental protection. Therefore, this item was the most important consideration when the manufacturer designed the PSD-650. After adjustment and technical integration, a brand-new "Dynamic Class A Circuit Technology".

Many friends may be curious. Many A/AB hybrid power amplifiers or later stages enter the A state when the power is low, and when they reach or exceed a certain power, they will be converted to AB. Why is the sound elegant? Do the opposite", low power is class AB, high power is class A? It turned out to achieve the purpose of saving power and reducing the temperature of the case. Generally, if we enjoy music in the home environment, we often only need a few tenths of a watt. At this time, the use of the lower energy consumption class AB is the most suitable. Of course, to appreciate a symphony with a large dynamic bursting requires more power, and at this time, the use of Class A will have better control of the speakers. Therefore, the dynamic class A technology of Shengya is low power and class AB, high power It is a class A state. In addition, how does this 1.5V (0.3W/8Ω) achieve accurate measurement? The factory of Shengya stated that the monitoring system in this circuit uses very precise laser induction transmission control, which is absolutely accurate. It seems that Shengya has done a lot of work on this!

4. The design materials are also unambiguous

The material used has always been Shengya's focus. The PSD-650 rear stage is no exception. The internal components are also components of fever brands. The internal audio signal connection line uses imported high-quality wires and the RCA input terminals and speaker terminals are both The WBT brand products made in Germany are used, and the Neutrik products made in Switzerland are used for the XLR terminals, so that the audio signal can be transmitted more ideally. The power input socket is a product of Furukawa made in Japan, which greatly increases the current flow and significantly improves the sound performance. In addition, the power filter part and audio amplifier part inside the machine are regularly isolated by metal plates to shield electromagnetic and vibration interference, so that a purer sound performance can be obtained, which fully reflects the sound performance of Shengya strives for the ultimate in sound. Fever grade production based on cost.

Test experience

When auditioning and matching, there are just a few sets of front and rear stages in the audition room, among them there are many German SIE mixers that are beloved by enthusiasts, and the matching speakers are FYNE AUDIO F303, Apertura precision Armonia floorstanding speakers, PMC OB1i, Vandersteen Wandengting 1C and other speakers of different prices and levels. In this audiovisual experience, we have a more in-depth understanding of the sound performance of the CS-6 flagship gallstone hybrid preamplifier and the PSD-650 full-balanced high-power Class A stereo postamplifier.

At the beginning, I auditioned with a complete set of acoustics. At the beginning, I did not use the dynamic A output function of the later stage. The first audition was the "Chopin Project" album. The violin and piano ensemble was full of tranquil atmosphere. The CS-6 preamplifier and PSD-650 postamplifier show a clean and clear sound. On this basis, the typical and rich colors of the piano are reproduced, and the delicate and elegant violin playing is even finely carved. Skills, this combination shows the delicate and clean sound in the recording. After opening the dynamic category A, the sound is more delicate and gentle.

Play "Tutti! "In the first song, this combination showed me the liveness of a symphony orchestra, turning a small audio-visual room into a concert hall. There is no problem in the performance of the details, the sound of the string is vivid, and the sound of the triangle is also very complete. In the chapter of great dynamics, the entire sound field is like a rock without any distortion. The rich layers, depth, and huge orchestra come with thick low frequencies, and at the same time, the individual sounds of the string group, wood pipe, and copper pipe in the orchestra can be heard, creating a huge sense of scale of the music scene. I believe that for the PSD-650 post-level, these are the performance of pediatrics. Then listen to the big dynamic clips of "Firebird", thanks to the powerful driving force of the later stage, the low frequency and even the ultra low frequency are very full, and the sound field is full. This kind of complex and heavy clips requires the analytical power and layering of the front stage. If the front stage cannot describe the lines of each voice, it will easily appear chaotic when the voices are merged. Of course, the control of the latter stage cannot Little, in front of this extremely high threshold, the performance of this set of front and rear levels passed the test smoothly.

In terms of vocals, the well-known "Hotel California" was played. This system still has a very clear and quiet background, which vividly depicts the colors, textures, and positioning of various instruments, such as the solid and powerful drums at the beginning of the song. A trace of "blunt" or vague signs, the moist and crystal sound of the guitar, the position of the three guitars on the left, center, and right, and Don Henley's majestic voice made the author unable to extricate himself from intoxication. At the end of the song, the three band members started to sing to each other and show off their skills with the enthusiastic audience atmosphere. The different sounds of the acoustic guitar and the electric guitar and their respective playing techniques Can be distinguished effortlessly. The way these three musicians perform when they show off their skills is very similar to that of jazz: the three guitars take turns as the protagonists, and when one guitar is the lead, the other two play the chords, intertwining and echoing each other to make the way of expression. It is more full and vivid, and this system can reveal this kind of "master-slave relationship" deeply!

I have simply listened to the combination of Shengya CS-6 flagship gallstone hybrid preamplifier and PSD-650 fully balanced high-power Class A stereo postamplifier. The sound bottom is very clean and transparent, the sound is relatively pure, and the speaker control is also excellent. Yes, I believe that with different speakers, they can maintain the sound style of the speakers themselves. If you use Shengya CS-6 preamplifier alone or PSD-650 postamplifier alone, and use it with other equipment, what kind of wonderful changes will it have with the equipment in the audition room?

After audition and comparison, the colleagues in the editorial department agreed that the sound of the PSD-650 rear stage is pure, without MSG, what kind of sound the front-end equipment is, and what kind of sound is given by the PSD-650 rear stage. In the AB class, it is The control is quite good, and in the dynamic type A, the sound is more delicate, and after more than an hour of use, the temperature of the body will not be too hot, thanks to the huge heat sink and the dynamic type A design. The CS-6 flagship gallstone mixed preamp sound bottom is also relatively pure, although the bile duct is added as a buffer, the sound bottom is still relatively refreshing, and there is no too strong bile taste. It can also achieve excellent performance when used with other rear-stage or active speakers.

to sum up

The CS-6 flagship gallstone hybrid preamplifier and PSD-650 fully balanced high-power Class A stereo post stage, Shengya integrates more than 20 years of technology and innovation into them, and the design of the gallstone hybrid preamplifier is even rarer. , And the newly-developed dynamic class A is set to be class AB for low power and class A for high power, which is very special. The overall sound performance is quite innocent and the driving force is good. This kind of combination has very high playability and is very suitable for friends who like to play. This system has fully demonstrated the charm of fever. It can be seen that Shengya's progress in recent years is very obvious. I believe that the future "Voice of China" will no longer be a distant dream.