When playing audio, one thing that never changes is the word "match". In the past, the store may give advice on matching, and the customer may refer to the store’s opinions or make a choice based on their own experience and listening taste. In recent years, more and more speaker manufacturers have custom-made power amplifiers according to their own products to make their products play their due excellent effects. Recently, Ligao Audio, the domestic general agent of British speaker brand ATC, and the Chinese audio brand Shengya Audio have launched an exclusive A-238 fully balanced Class A combined amplifier, which can be described as the first domestic and imported brand in the mainland audio industry. Cases of customized products.

Established in 1993, Lego Audio is the domestic general agent of the British speaker brand ATC, dealing in imported high-end audio and cables. Mr. Liu of Lego Audio introduced that Lego Audio has been selling foreign audio brands for more than 20 years. However, audio is not just about being expensive, but about matching well. There have been many cases in the process of acting for ATC, that is, facing the problem of power amplifier matching. ATC speakers have the problem of low sensitivity and difficulty in driving. They need high power and high current power amplifiers to promote. The price of imported power amplifiers suitable for matching is relatively high. One of the factors that customers will worry about.

Recently, Mr. Liu’s inspiration flashed on a whim, is there a domestically-made power amplifier that can perfectly match ATC speakers? During the search, Mr. Liu consulted the professional opinions of players and audio media, and the feedbacks were very unified-the domestic gallstone hybrid amplifier that can be matched with ATC speakers is none other than acoustic. The bosses of the two companies have been acquainted for many years. After Mr. Liu told Mr. Shengya his idea, the two hit it off and started a cooperation model.

Shengya Audio can be said to be the representative of China's gallstone hybrid amplifier. Since its establishment in 1991, Shengya Audio has won the trust and support of a batch of customers with its innovative design concept, sincere and enthusiastic service attitude, aggressive entrepreneurial spirit, and honest and trustworthy corporate reputation. At the same time, being able to pass the strict testing of German laboratories and musicians, and be able to gain a foothold in the European market for more than 20 years, is by no means an illusion.

This "marriage" between Shengya Audio and British speaker brand ATC is indeed an epoch-making testimony to domestic brands. In recent decades, domestic audio products have developed from low prices and shoddy manufactures to "global factories"-ODM and OEM for brands all over the world, and now Chinese brands can be on par with foreign brands, and can cooperate with foreign well-known brands to launch customized products. Products, it can be seen that the domestic brands have made great progress in recent years and have been recognized by the world.

The power part is the foundation of a machine. Shengya uses independent power supply for the front and rear parts of the A-238, and the front part uses a precision high-voltage regulated power supply with a hybrid of electron tubes and transistors. The voltage stability is extremely high, the AC ripple coefficient is extremely low, and the sound performance is more " Bile taste". The filter capacitor used in the latter part is the Japanese ELNA brand FORAUDIO series 10000μF/50V, with a total capacity of up to 120,000μF. The toroidal high-power power transformer is placed in a shielded box in a separate chamber. The entire transformer is made of Japan’s Nippon Steel core and filled with epoxy resin, which effectively reduces the vibration and noise interference generated by the transformer during operation, and affects the sound quality of the whole machine. And tone improvement plays an important role.

The pre-amplification part adopts the imported ECC83 electronic tube common-cathode amplifying circuit, and the imported ECC82 electronic tube serves as the SRPP driving amplifier, so that the A-238 has beautiful sound and great dynamic performance. In terms of volume control, the electronic volume control chip CS3310 manufactured by American Crystal Company is used to control the error level between channels within 0.5dB, which is much better than the control accuracy of the quadruple mechanical potentiometer ±3dB.

The rear stage is composed of 32 Toshiba high-power transistors to form a 0dB current amplifier circuit, with 100W/8Ω pure Class A output power per channel. The dynamic performance is very good. It is more than enough to drive speakers below ATC 40. The electronic tube circuit cross-connect and de-cross-connect capacitors use the German WIMA brand MKP series high-end audio dedicated capacitors.

Shengya A-238 has three major functions specially designed for ATC, namely ATC Power mode, Gain switch, and Bass low frequency management technology. Among them, ATC Power is a working mode specially designed for ATC speakers. The user only needs to press this switch, and the A-238 will be converted to pure class A amplification mode, and it will be in class AB amplification mode when reset. Shengya believes that due to efficiency reasons, ATC speakers need to use pure Class A work to better promote and control the movement of the unit. The Gain gain is the gain switch of the whole machine. When pressed, the whole machine increases the amplification by 2dB, and when reset, it is the standard 0dB amplification. This design can adjust the looseness of sound for ATC speakers, and also adjust the sense of compactness. There will be a sense of looseness when increasing by 2dB, and a sense of compactness at 0dB.

The Bass switch is a bass management mode switch. When turned on, the low frequency band of 20Hz-100Hz will attenuate the curve of 0.1dB-1dB. The lower the frequency, the greater the attenuation, but there is no attenuation in the 100Hz-20kHz frequency band. When closed, the full frequency range of 20Hz-20kHz is 0dB standard mode. The function of this switch is to moderately control the bass of the ATC bookshelf box, especially in terms of ultra-low volume. When playing a large number of ultra-bass software at high volume, it prevents the woofer from overloading and distortion.

This audition was conducted at Lego Audio on the 4th floor of Guangzhou Haiyin Plaza, with ATC SCM 40A floorstanding speakers. SCM 40A is a three-way three-unit design with a 25mm dome tweeter, a 75mm super circular center and a 164mm woofer. The impedance is 8Ω and the sensitivity is 85dB. In terms of wiring, a two-wire crossover method is adopted, and the middle and high pitches and low pitches are connected separately.

First play a song "Field Of Gold" by Eva Cassidy. The soft accompaniment instrument is relaxed and cheerful. Eva Cassidy's voice is strong and magnetic. When you close your eyes, you can clearly feel the throat rhyme and lips change. , The image is very clear. The main accompaniment instrument is a guitar. Don't look at it as a simple combination of guitar and singing. It's actually very testy. If the sound resolution is not enough, it will sound very vague. This A-238 still retains the unique sound of beautiful musical lines when it is output in ATC Power mode. These are from the fast instantaneous response. A-238 is not muddy and sounds more accurate, if it is transparent and bright. In terms of modern equipment, the A-238 and ATC SCM 40A floor-standing speakers have a mesmerizing warm color.

The Baltic Chamber Orchestra conducted by Gidon Kremer produced by ECM

(Kremerata Baltica), a modern work "Chiaroscuro" created by Giya Kancheli. This is a majestic and dynamic work that tests the control and endurance of power amplifiers and speakers. It is undoubtedly a "touchstone" for testing A-238's dynamic control capabilities and sound field restoration capabilities. However, when you increase the volume to play the most tested pieces of equipment, the Soundya A-238 can push the ATC SCM 40A out of a magnanimous and calm manner. It has a strong energy supply capability, and there is no dynamic compression or collapse in the scene. There is no blunt or scattered discomfort. Instead, the shocking dynamics are transmitted calmly and steadily. At the same time, the entire band is arranged in an orderly manner, the expression of depth is clearly defined, the balance is harmonious and natural, and the sense of stage is also quite present. High standard.

Class A power amplifier has a fatal weakness, because its conversion efficiency is not high, the power supply is often unable to support its performance in large dynamics, that is to say, it is easy to "feel" and it is not enough when listening to a large symphony. Enjoyable. After listening to the above tracks, I believe that A-238 benefits from the powerful toroidal transformer and the accompaniment of dense large ponds. Under the combined action of precisely matched transistors, it still has precise control. The A-238 shows beautiful control, and it is not easy to maintain bright colors at high volume.

When playing the "Toast Song" in the "Variations on Verdi" produced by CHANDOS, the sound of the piano is soft and warm. With the blessing of the guts, the unique sweetness is also very prominent. Listen carefully, this set The sound of the combination is naturally smooth and angular. It is not only easy to distinguish the sound image positioning of the lead violinist Turovsky and the concert violinist Trostiansky, but also the response and competition between them can be heard clearly, Jane A simple two pianos can bring out a lively and jumping atmosphere and clearly explain the relationship between master and slave. This is the gallstone hybrid amplifier that can express such an appropriate tone and strength.

Then listen to "Chopin's Piano Concerto No. 1 and No. 2" which Zimmermann conducted and acted as a soloist for the Polish Youth Orchestra. Listen carefully to the string group of the orchestra. Under the direction of Merman, the small-scale orchestra has a good grasp of the changes in strength and weakness. The combination of Shengya A-238 Gallstone Hybrid Amplifier and ATC SCM 40A Acoustic Loudspeaker can express the fineness and slenderness of string music very well. The wood pipe group and the brass pipe group echo the string music, and the music has a great sense of hierarchy. After the orchestra part is over, the piano-shaped single figure appears, as if to tell the words in Chopin's heart, conveying the romantic calmness of Chopin when he wrote this work With a slightly melancholic mood, the orchestra came in to talk to the piano. Listening to Chopin like this is really great!

Shengya A-238 Gallstone Hybrid Power Amplifier is an epoch-making power amplifier. It is China’s first amplifier designed specifically for foreign speaker brands. The design of Gallstone Hybrid, fully balanced Class A circuit, and 3 specially customized for ATC speakers The functions are ATC Power mode, Gain switch, Bass low frequency management technology. Thanks to Shengya's rich accumulated experience and rigorous design technology over the years, it can promote ATC's mid-range speaker products very well, whether it is sound coordination, consistency, and balance. Achieving an excellent balance with realism, Shengya obviously has enough ability to firmly control the sound direction in its own grasp. Shengya Audio has created Chinese split amplifiers, gallstone mixers and gallstone machines exported from Europe, and now it has created a customized amplifier for foreign speaker brands in China. The Voice of China is no longer an unattainable dream.