Denon DCD-1015G

This model is Denon's main sales model among mid- to low-priced CD players. It has a large market share and is still being marketed. , was featured in the British "What Hi-Fi?" 》Audio magazine rated it as a 5-star product. Although the price of this machine is not high, the circuit design and materials used inside the machine are unambiguous. The movement is a self-developed suspended pickup transmission system. Digital signal processing still uses the ALPHA converter with adaptive linear harmonic algorithm and automatic low-pass filtering adjustment. The output 20-bit digital signal is then sent to the 20-bit 2-D/A converter, coupled with Denon's original LAMBDA super linear converter, making the whole machine The output audio signal is more natural, transparent and clear. This is the reason why DCD-1015G has been firmly established in the market for many years, and it is also the advantage of this machine in this level of models. The appearance of this machine is available in gold and black colors for users to choose from. The gold model has piano boards as bright as mirrors on both sides, and the price is about 180 yuan higher.

DCD-1015G has stable and reliable performance and a very low failure rate. When playing large-dynamic music, the sound field of this machine is solid and wide, and the sense of dynamics is very good. It can display cadence and ups and downs of sound effects. When playing vocal and instrumental music performances, the positioning of singers and performers is accurate, and the atmosphere on the scene is real. Believable. Compared with expensive models, the overall sound quality of this machine is slightly stiff and lacks the suppleness of high-end machines. However, this machine has won the trust of the majority of users with its high cost performance.

Main technical parameters

Frequency response: 2Hz-20kHz; signal-to-noise ratio: 112dB; dynamic range: 100dB; channel separation: 105dB; harmonic distortion: 0.002% ; Overall dimensions: 470mm×115mm×288mm; 4.9kg.

Market reference price: 3,600 yuan.

Denon DCD-815G

This is an evergreen popular machine launched by Denon Company on the market a few years ago and is still being marketed. The appearance of the machine is golden champagne color, with piano boards on both sides, and the production process is relatively sophisticated. The machine's movement uses a suspended pickup component, which has the advantages of low mechanical noise and fast tracking speed. The machine inherits the company's specialty technologies: 18-bit LAMBDA ultra-linear converter and 20-bit 8x sampling digital filter, which makes the waveform of the analog output signal smoother and ensures the purity of the sound and the accuracy of the audio. In order to facilitate user upgrades, there is a digital coaxial interface on the back of the fuselage.

When DCD-815G plays music with strong bass, it can reproduce it clearly and has a good sense of speed. The instrumental music played is smart and smooth, and the vocal performance is real and natural, without any unsatisfactory performance. Compared with the company's high-end models, the bass is slightly less controlled, and the airiness and lingering sound of the treble are not as satisfying, but it is still a value-for-money model.

Main technical parameters

Frequency response: 2Hz-20kHz; signal-to-noise ratio: 107dB; dynamic range: 98dB; channel separation: 103dB; harmonic distortion: 0.0025% ; Overall dimensions: 470mm×100mm×280mm; 4.4kg.

Market reference price: 3,000 yuan.

Marantz CD player

The audio equipment produced by Japan's Marantz is well-known in the industry. In the early years, it was a representative of high-end audio. Now it is derived from Japanese audio and European traditional music styles. Perfect combination. The company's most representative product is a series of CD players with superior quality. Each model has undergone several generations of improvements, constantly introducing new ones, and has become a favored brand among audiophiles with its high cost performance. The biggest feature of Marantz CD players is their natural and transparent sound, which is highly musically appealing. These are closely related to the company's design philosophy and the components used.

Marantz CD-14

This machine is the latest high-end machine launched by Marantz. The appearance has the consistent style of the company's high-end CD players. The body is composed of a steel frame, a copper-plated bottom plate, metal die-cast thickened side panels and a finely crafted aluminum alloy panel.

The transmission mechanism inside the machine adopts Philips' top-notch resonance-free linear scanning CDM-12.3 laser mechanical system, combined with the fast-response low-noise digital driver DDS to form a smooth and sensitive operating performance. The peripheral circuit design of the CD-14 machine is sophisticated and sophisticated. The newly developed chip CD7A is used in signal processing and servo circuits. The digital filter uses the DF7 chip. The signal is first oversampled 8 times, and then the noise suppressor is used 3 times. And the 1bit digital signal with 192 times oversampling is sent to the DAC. The digital-to-analog conversion of this machine uses the well-known bit stream DAC-7 in the audio industry. Each channel is equipped with a dual DAC TDA1547 integrated circuit. A special differential circuit is used to eliminate in-phase noise, and the two sets of DAC outputs are used. Marantz's unique HDAM high-speed voltage amplifier circuit is used for feedback to prevent level errors at both ends. Such a perfect circuit design gives people a guarantee of confidence and makes the playback sound quality more pure and flawless. The machine is equipped with coaxial and optical fiber digital output terminals, and is equipped with an XLR balanced output interface. The CD-14 player has a mellow and fragrant tone. Its high frequency is slender and elegant, the intermediate frequency is round and full, and the low frequency is rich in elasticity. The density, texture and decomposition ability of the sound are impressive. It is a high-quality CD player worth recommending.

Main technical parameters

Frequency response: 10Hz-20kHz±0.2dB; signal-to-noise ratio: 110dB; dynamic range: 98dB; channel separation: 110dB; harmonic distortion: 0.0015%; overall dimensions: 458mm×110mm×369mm; weight 11kg.

Market reference price: 8,900 yuan.

Marantz CD-17KI

This machine is based on the Marantz CD-17 series and was personally improved by the company's head of audio technology, Mr. Ken Ishima. A mid-to-high-end signature version? KI-Signature CD player. This machine has improved components and sound effects compared to the CD-17 series, and has been rated as the most worth buying model by many audio magazines. CD-17KI has a streamlined and ultra-thin design. The golden champagne color panel only has a display screen, a film compartment and seven round buttons. The "Marantz" trademark is a directly stamped concave font, which is quite novel. The machine's transmission mechanism uses Philips' advanced CDM12.1 turntable, and its low-noise digital servo control uses the SAA7372 chip, which can accurately and quickly scan the data on the record. In terms of circuit, it uses a digital-to-analog converter composed of Philips' TDA1547 and SAA7323. This DAC, referred to as DA7, has high resolution and transparency. The analog output still uses a fast-response HDAM circuit, which can faithfully reproduce the difficult-to-process elements in music. Transient and dynamic contrast. As a signature machine, its internal structure and materials are more particular. The power supply part uses a toroidal transformer with high magnetic permeability; the ELAN gold audio capacitors and precision color ring resistors are dotted inside the machine; the bottom plate, back plate and The inner partitions are all surface-plated with copper.

The CD-17KI player can play all types of music with ease. The high-frequency part of the sound range is not too bright. The presentation of violins and triangles is gorgeous and clear, and the metal is less sharp. The mid-frequency is round and soft. The texture and density are quite good, and the sound is relaxed and moving; the low frequency is rich and powerful, the sense of space is more prominent, and the fat and swelling phenomenon that is not free and easy is swept away. This machine is really the first choice for lovers who deliberately pursue music performance.

Main technical parameters

Frequency response: 20Hz-20kHz±0.2dB; signal-to-noise ratio: 106dB; dynamic range: 97dB; channel separation: 103dB; harmonic distortion: 0.002%; overall dimensions: 458mm×83mm×315mm; weight: 7.8kg.

Market reference price: 6,800 yuan.

Marantz CD-19A

This is a mid-range model recently launched by Marantz. It absorbs part of the technology of the company's CD-17 series of machines. In terms of circuit structure Certain simplifications and improvements have been made. The machine uses the Philips linear tracking CDM-12.1 movement in the transmission mechanism, and is equipped with a new low-noise digital power-assist driver. It has better shock resistance and can select songs quickly and accurately.

The CD-19A is a big step up from the CD-63 model in terms of components and sound quality. It uses a high-quality low-magnetic-leakage EI power transformer. The main filter capacitor and signal output capacitor are upgraded to the ones usually found in high-priced models. "ELAN SILMIC" audio-specific electrolysis has just appeared. In terms of digital circuits, the machine uses a 1-bit D/A converter. After the digital signal is filtered by the NPC digital filter chip, two SM5872BS chips are used to decode the left and right channels respectively, which effectively reduces the conversion error and enhances the reproduction ability of weak signals. . The analog output follows the two metal packages that Marantz has been famous for for many years and are engraved with HDAM components. It has the characteristics of ultra-wide bandwidth, large dynamics, and high analytical power. The whole machine is equipped with one set of coaxial and optical fiber digital outputs, providing room for external decoders to upgrade the equipment.

CD-19A has a better musical taste when playing, and the audio energy and detailed analysis capabilities are also relatively good. Especially the vocals in the mid-frequency band are round and smooth, inheriting Marantz's consistent gentleness and sweetness. temperament. If measured in terms of sound quality and price, this is a relatively cost-effective CD player.

Main technical parameters: Frequency response: 20Hz-20kHz±0.3dB; Signal-to-noise ratio: 110dB; Dynamic range: 97dB; Channel separation: 103dB; Harmonic distortion: 0.0015%; Appearance Dimensions: 454mm×82mm×313mm; weight: 7.8kg.

Market reference price: 4,500 yuan.

Marantz CD-4000

This machine is a low-priced CD player put on the market by Marantz Company. The price is only about 2,000 yuan, which can satisfy those who like to listen to music. General hobbyist needs. This machine has a novel appearance and better manufacturing technology. There is a protruding arc-shaped cover on the left side of the panel, and a clear and beautiful dot matrix display in the middle. The movement uses the VAM1201 pickup system provided by parent company Philips, and is equipped with a low-noise digital driver commonly used in many mainstream models of Marantz, ensuring accurate and smooth operation. The machine is equipped with a 1-bit digital-to-analog converter, and the chip is the newly developed TDA1545. The decoding part uses two SM5872BS chips to work independently for the left and right channels, which greatly reduces non-linear distortion. The analog part still uses a high-speed voltage amplifier circuit, making the conversion rate as high as 80v/μS. This series of optimized circuit designs makes this affordable machine have lower background noise, and its dynamics and clarity are also impressive. The machine has a pair of analog audio outputs and a coaxial digital output interface.

The CD-4000 can produce beautiful and harmonious sound effects, with a rich sense of volume in the low frequencies. It overcomes the shortcomings of the low-priced bass alone. The midrange is soft and smooth, and the treble is brighter, but slightly It feels sharp. With its high cost performance, this machine brings an accurate choice to enthusiasts who do not want to spend too much.

Main technical parameters

Frequency response: 20Hz-20kHz±0.5dB; signal-to-noise ratio: 98dB; dynamic range: 95dB; channel separation: 85dB; harmonic distortion: 0.0063%; overall dimensions: 440mm×87mm×280mm; weight: 2.9kg.

Market reference price: 2,000 yuan.

Sony CD player

In 1982, Japan's Sony Corporation and the Dutch company Philips jointly formulated CD specifications, and subsequently developed the world's first CD player, CDP-101. As the inventor of the CD player, its quality and performance are unanimously praised by audiophiles. Sony CD players can stand out among many brands because the company strives for excellence and perfection in its products, and has rich experience in the development of audio equipment and advanced digital technology. "Digital Dream" and "Creating Glory Again" are Sony's new direction and goals for the development of digital audio products.

Sony CDP-XA7ES

Sony's development and contribution to high-end CD players are witnessed by people in the industry. Among them, CDP-XA7ES, the top player in the ES series, is A model model for pure music. The internal structure and design are derived from the company's CDP-R10/DAS-R10 split flagship CD player.

The machine's movement adopts an "optical fixed method" mechanical transmission device, which fixes the light-weight laser head on the base. This retrieval method that moves the disc on the movement reduces the pressure on the pickup and is different from the traditional pickup movement. Compared with other methods, the speed of entering and exiting the box is light and moderate, and the signal reading is stable and accurate. At the same time, the high stabilizer of the optical disc is made of pure copper and operates by pressing down from above, which reduces the vibration of the optical disc when it runs at high speed. The machine is equipped with its own original current pulse digital-to-analog converter in the circuit, replacing the voltage pulse method that is easily affected by power supply changes, eliminating noise caused by the calculation circuit, and using a fully fed forward digital filter. , creating the excellent sound quality of this machine. In terms of the overall structure of the machine, the machine adopts a number of measures regardless of cost, such as copper plating on the inside of the chassis to improve the noise reduction and shielding effect; it adopts a cast steel chassis and frame, with exquisite The combined structure allows vibrations to cancel each other out; an advanced R-type central power transformer is selected, with a spherical shape and cross-section, which not only suppresses vibration but also controls the leakage of magnetic lines of force.

CDP-XA7ES is a dazzling high-end CD player. The sound it creates has high transparency and appeal, showing unique full-grained, elegant and delicate nobility, especially for weak sounds and The reproduction of details is even more charming, and the entire sound range has an extraordinary presentation.

Main technical parameters

Frequency response: 2Hz-20kHz±0.3dB; signal-to-noise ratio: 119dB; harmonic distortion: 0.001%; ??overall size: 430mm×125mm× 375mm; weight: 15kg.

Market reference price: 13,000 yuan.

Sony CDP-XE530

This machine has a stable and elegant appearance, and the production process is also good. It uses a central turntable mechanism. Although it is a popular model movement, its performance is relatively mature. The operation is very reliable. In addition to the common play, stop, front and back search buttons, etc., the panel of the machine is also equipped with a rotary program jump button, which is very convenient to operate. Sony has used some new digital technologies in this machine, such as a 1-bit pulse digital-to-analog converter, which has higher analysis capabilities for audio signals; and a variable slope digital filter, which can make the sound rich and natural. The back of the machine is equipped with an optical fiber digital output, which can be connected to an external D/A converter or an external MD machine for digital transcription. The price of CDP-XE530 is only 2,000 yuan, but its function settings are better than those of other models in the same price range, and its sound effects also have certain advantages. The sound emitted by this machine is clear and bright, with a good sense of presence and atmosphere. The sound is pure and has a certain intensity. When playing solo songs and light music, it is not inferior to higher-priced CD players. The disadvantage is that during large-dynamic playback, the bass is a bit loose, and the treble is hard and lacks a delicate listening experience. However, we cannot demand a comprehensive sound effect from a model at this price.

Market reference price: 2,000 yuan.

Panasonic CD player

Since the launch of the first CD player SL-P10 in the 1980s, Panasonic has been actively carrying out a series of technological innovations to welcome the advent of the digital age. , the high-performance digital signal processor, MASH digital-to-analog converter, high-precision PLL circuit and AA class output circuit used in CD players are all our unique skills. Panasonic's purpose in making CD players is: "Develop silent technology, provide Hi-Fi listening experience, and demonstrate perfect processing of sound."

Panasonic SL-P2000

The appearance of the machine is golden champagne color, with piano panels on both sides. The front panel is made of 8mm thick aluminum alloy, and the layout on the panel is neat and standardized. The chassis structure uses the anti-vibration THCB Technics hybrid structure base developed by Panasonic. Its carefully crafted appearance gives an excellent first impression. The machine's laser pickup adopts a load-floating optical system, and the high-precision drive mechanism and digital servo circuit make reading record data fast and accurate. The machine is equipped with the MASH 1-bit digital-to-analog converter first developed by Panasonic, and uses efficient noise shaping technology to increase the signal-to-noise ratio of the whole machine to 120dB, and the theoretical dynamic range is as high as 125dB.

In order to improve the sound quality, this machine is also equipped with a Class A-like "CLASS AA" output circuit, a high-quality digital weight reduction circuit and a precision instrumental sound quality differential circuit. These advanced circuit designs make the sound effect of this machine extraordinary. . The SL-P2000 machine is also made with great sound in mind in terms of materials. The power supply part uses a high-grade R-Core transformer and is equipped with Panasonic's famous "virtual battery" power supply system, which has a level similar to battery power supply. It is commendable that the newly developed parent series electrolytic capacitors are also used in the machine. The capacitors have advanced electrolytes and aluminum foil structures to obtain superb conductive properties. When used in actual applications, they can reflect delicate music and produce lively and vivid music. sound effects.

The SL-P2000 machine maintains the warm and mellow tone consistent with Panasonic's high-end audio. The sound when replaying music is elegant and soft, the bass has sufficient volume, the density and space of the mid-range and high-pitched sounds are quite good, and the sound is The reproduction is lifelike, the priorities are well controlled, and it gives people a high-style sound effect.

Main technical parameters

Frequency response: 2Hz-20kHz±1dB; signal-to-noise ratio: 120dB; dynamic range: 110dB; harmonic distortion: 0.0014%; overall size: 483mm ×134mm×332mm; weight: 12.5kg.

Market reference price: 9,200 yuan.

Panasonic SL-PG490A

In recent years, some well-known audio companies have successively launched low-priced CD players in order to meet the needs of the market. Panasonic has also devoted itself to developing a variety of CD players. It is a popular machine with high quality and low price, and has high market competitiveness. Among them, SL-PG490A is the company's most representative model. Not long after the machine was put on the market, it was featured in the British "What Hi-Fi?" 》 magazine named it a "Best Buy" award. The SL-PG490A has a novel shape and adopts a center-mounted cartridge design. The display screen is placed on the right side of the panel, making operation more intuitive. The machine uses a base that combines metal and engineering plastics to effectively isolate the source of vibration and reduce noise. The machine uses a simple and smooth turntable and is equipped with a servo circuit, which has good film reading performance and error correction rate. The machine still uses the MASH 1bit D/A converter newly developed by Panasonic. This converter has low production cost and very stable and reliable performance. The sound playback of SL-PG490A has certain characteristics. The sound is gentle and smooth, and the range is relatively balanced. You will not feel tired or bored after listening for a long time, and it can be suitable for the playback of various music programs. Due to the production cost, the sound of the machine seems a bit flat and the resolution is slightly insufficient.

Market reference price: 1,400 yuan.

Yamaha CD player

The audio equipment produced by Yamaha Company has a high technical content, and the new generation CD player launched by Yamaha combines stable performance, beautiful sound quality and reasonable price. Yamaha's sound engineers rely on their rich experience in music, acoustics and digital technology to develop PRO-bit? Original bit-accurate reproduction is the company's patented technology, which converts 16-bit data on CD records into 20-bit, enabling audio analysis The force and continuity tend to be perfect, without any sharp, cold, hard digital sound caused by quantization errors, and the resulting sound effect is as realistic as the original recording.

Yamaha CDX-993

The appearance of the machine is fresh and simple, and the function keys on the panel are neatly and beautifully laid out. The chassis uses a double-layer metal top cover and a double composite base, and uses the company's The designed ART anti-vibration mechanical structure makes the whole machine weigh 9.6kg. The PRO-bit digital circuit installed in the machine uses the self-developed YAC-514 chip, which contains filtering and shaping functions. Current professional recordings use advanced 20-bit recording technology, but the music signals stored on CDs are still in 16-bit format. When music is transcribed to records, some audio data will inevitably be attenuated. Yamaha’s original bit-accurate reproduction technology Some additional information is added to the 16-bit signal read out from the record, making the audio signal waveform output by the converter closer to the characteristics of the analog signal. This feverish touch makes the sound information reproduced by this machine richer and more detailed, making it pleasant and soft to listen to.

Each level of output of this machine is equipped with Class A discrete amplification device and sound fine-tuning circuit, which contributes greatly to the improvement of sound quality.

The biggest feature of this machine is that the sound is full and mellow, and the sound field is restored to reality. When playing vocals and instrumental music, the high frequency is relatively soft, with obvious smoothing effect, but there is no loss of high frequency information. On the contrary, the audio details it emits are very good, giving people a natural style of listening. Audio critics from many Japanese audio magazines rated the audio performance of this machine highly.

Main technical parameters

Frequency response: 2Hz-20kHz±0.5dB; signal-to-noise ratio: 115dB; dynamic range: 100dB; harmonic distortion: 0.0025%.

Market reference price: 5,000 yuan.

Yamaha CDX-393

This is an affordable CD player put on the market by Yamaha. The whole machine has complete functions and is easy to use and operate. The machine adopts a simple and reliable mechanical transmission system and is equipped with Yamaha's original high-intelligent servo circuit, which has better signal pickup sensitivity and operation stability. This machine incorporates Yamaha's advanced technology in the circuit and uses a 1-bit digital-to-analog converter. This new D/A converter has low manufacturing cost, small precision discreteness, and effectively eliminates "zero-crossing distortion." The sound quality of the CDX-393 is quite satisfactory, and the level is slightly inferior when playing large dynamic music. However, the sound in each frequency band is relatively balanced, the mid-frequency has a good density, the extension of the high and low frequencies is not too wide, and the presentation of music details is still good. . Due to its low price, good sound performance and high cost performance, the machine has been rated as a 4-star sound quality award by the Swedish "Hi-Fi Musik" audio and video magazine, and listed as a special award by the American "Audio Video" audio and video magazine. Recognition Award.

Main technical parameters

Frequency response: 2Hz-20kHz±0.5dB; Signal-to-noise ratio: 105dB; Dynamic range: 95dB; Harmonic distortion: 0.003%; Dimensions : 435mm×96mm×273mm; Weight: 3.5kg.

Market reference price: 2,200 yuan.

Yamaha CDC-765

This machine is a multi-disc CD player launched by Yamaha. It uses a newly developed fully-open tray, and the X-shaped disc changing mechanism extends outwards. It can access 5 CD records at the same time. Its laser pickup adopts a floating structure and does not have a disc stabilizer or a highly intelligent digital servo system. The operation is balanced and reliable, and the operation is very convenient. This machine also uses a new PRO-bit D/A converter with 20-bit signal data processing capabilities. And filtering and shaping are performed before digital-to-analog conversion, so that the sound quality of the machine is pure and natural, and the reproduced sound is more realistic than the original recording. In terms of function settings, the machine has practical functions such as TOC memory, CD tape synchronized recording start, record intro scan, highest peak search, 3 modes of recording editing, 10 levels of direct track access and 40 tracks of random programmed playback. There is 1 optical fiber digital output on the back.

The sound of the CDC-765 machine is rich and balanced, with low coloration. The overall sound quality is slightly worse than the CDX-993 machine, but better than other CD models of the company. In 1998, this machine was awarded the Best Product Award of the Year by the American audio and video magazine "Audio Video". Because this machine has rich functions, is easy to operate, and has good sound quality, it is the best choice for some players who frequently change records and listen to music.

Main technical parameters

Frequency response: 2Hz-20kHz±0.5dB; signal-to-noise ratio: 115dB; harmonic distortion: 0.0025%; overall size: 435mm×116mm× 388mm; weight: 5.8kg.

Market reference price: 4,500 yuan.

Yajun CD player

Audiophiles all have this feeling about audio equipment. Some equipment is like passing smoke and fleeting; some equipment is unforgettable and long-lasting. Because some famous European and American manufacturers have their own experience and advantages in the development of CD player circuit structures, and their sound calibration methods are even more unique, many experienced audiophiles have a soft spot for them.

British Yajun is an audio brand that has left a deep impression on audiophiles.

Yajun Alpha-9

This machine is the highest model CD player launched by the British Yajun Company. It has a streamlined arc shape. The model name on the panel is gold-plated and dark gray. The appearance looks elegant and generous. In order to obtain the CE mark and EU standards, the internal structure, materials and technical standards are very particular. This machine uses the CDM-14 pickup transmission system made in France. This turntable has excellent performance, outstanding vibration resistance, balanced operation and low noise. The digital circuit inside the machine uses the DSP-56002 chip from Motorola in the United States, which contains a high-performance digital filter and transmits the digital signal with 64 times sampling and 24-bit accuracy to the DAC. This machine uses a 24bit/96kHz digital-to-analog converter. The special digital-to-analog circuit board was jointly developed by Yajun Company and the famous British professional audio manufacturer DCS after two years of joint research. The original "DCS Ring DAC" Technology and HDCD decoding function significantly reduce the background noise of the signal and double the resolution of fine information. The multi-layer circuit board design in the machine minimizes the signal path. Its high-power sealed power transformer and multiple regulated outputs separate the power supply for digital and analog circuits, effectively reducing crosstalk between digital and analog.

When the Alpha-9 player plays music, it gives people an authentic, spotless, and sweet feeling. Although the performance parameters given by the manufacturer are not very high, the music has a rich flavor when playing. Warm and friendly, the sound range has a very clear sense of air flow, and the natural, comfortable and detailed sound effect can conquer the listener. The year the machine was put on the market, it was featured in the British "What Hi-Fi?" 》Audio magazine rated it as a 5-star product.

Main technical parameters

Frequency response: 20Hz-20kHz; Signal-to-noise ratio: 105dB; Output level: 2.3Vrms; Dimensions: 430mm×85mm×290mm; Weight: 4 ．1kg.

Market reference price: 9,500 yuan.

Yajun Alpha-7

This machine adopts the traditional design of Yajun company's products, and its appearance is the same as the company's top machine Alpha-9. The movement still uses France's CDM-14, and its high-speed optical head amplification is shielded by a metal shell, which improves the signal reading capability and signal-to-noise ratio. This machine uses a multi-bit DAC chip. It is worth mentioning that its D/A conversion circuit board adopts a plug-in card method. Users can easily upgrade by replacing DAC boards of different grades. Although this method is common in circuit structures within computers, it is rarely used in CD players. The machine also has optical fiber and coaxial digital signal output interfaces.

The biggest saving grace of the Alpha-7 machine is the combination of precisely optimized circuit design and high-quality components in key parts to achieve the best cost performance. This machine can play out music with sufficient dynamics and smooth rhythm. The positioning of vocal instruments is accurate. Its slender and clean treble prevents the listener from feeling the lack of information about the atmosphere of the scene. The texture of the mid-range is compact and will not tire of listening for a long time. The bass dive is calm and methodical. There is still a certain gap between the overall sound quality and Alpha-9, but it can meet the needs of audio enthusiasts.

Main technical parameters

Frequency response: 20Hz-20kHz; Signal-to-noise ratio: 100dB; Output level: 2.3Vms? Dimensions: 430mm×85mm×290mm; Weight: 3 ．6kg.

Market reference price: 4,800 yuan.

Yajun FMJ-CD23

This is a top-level machine recently put on the market by Yajun Company. The factory has spent a lot of effort to carefully produce this brand image CD player with beautiful appearance and high-quality interior. The panel is made of 8mm thick aluminum alloy, and the silver-white appearance is full of modern tones. This machine is equipped with a top-notch digital-to-analog converter jointly developed by our company and digital specialist DCS, and is equipped with an improved 24-bit digital filter. The advanced circuit design makes the sound effect extraordinary.

Compared with the Alpha-9 machine, this machine uses a higher level of materials inside the machine, such as a special high-damping chassis structure that can prevent external radio frequency interference and further improve the clarity of the sound; a high-quality Teflon main circuit board And carefully selected audiophile-grade components make the audio layered richer and smoother, and the timbre sweeter and more soothing; the newly designed high-quality high-capacity transformer and multiple sets of voltage-stabilized power supplies ensure the deep and abundant sound of the whole machine. The sound effect of FMJ-CD23 machine is better than that of Alpha-9. The reproduced sound shows the unique noble atmosphere of British high-end audio. Its elegant and crystal sound seems to have been polished, giving people the warm and delicate feeling of listening to LP records.

Market reference price: 11,500 yuan.

United Kingdom

NAD-524CD player

The appearance of NAD-524 is medium gray, with a simple and bright board layout and practical basic functions. Style of NAD products. The turntable structure of this machine is solid and stable, and the film reading speed is fast, but the mechanical transmission seems to be noisy. The circuit design of this machine has a high starting point. The digital-to-analog converter uses a 24-bit chip from the American BB Company. The analog output stage also uses high-quality components for class A amplification, which is really rare in popular machines. The power supply part of this machine uses a high-capacity toroidal transformer, while most affordable machines nowadays use cheap ordinary laminated transformers, whose low power causes deterioration of sound quality. It can be seen that NAD Company attaches great importance to the design and investment of the core parts of this aircraft. This is its brilliance and has achieved twice the result with half the effort. The machine is equipped with a coaxial digital output terminal and comes with a full-featured infrared remote control with a unique appearance. The sound quality reproduced by the NAD-524 machine is quite excellent. The bass is deep and powerful with a certain sense of speed and control. The crisp and beautiful mids and highs are very attractive. The sound in the mid-frequency band is slightly thin, and the highs in large dynamics are hard. The machine has real and detailed sound quality characteristics when playing piano, orchestral music, vocal chorus and other types of music. It can be said that today, when the cost-effective AMC CD-6 and Philips CD-951 have disappeared, the NAD-524 can be regarded as the preferred model.

Market reference price: 3,400 yuan.

British AMC-CD6 CD player

This machine is an affordable machine assembled and produced by a British brand in Taiwan. In the second year after it was put on the market, it was picked up by the British audio magazine "What Hi- Fi? 》listed as a 5-star list. The machine adopts the Philips CDM-4 transmission system, which is durable and has excellent shock-absorbing performance. This turntable is Philips' only movement that can adjust the output of the laser head. It has better performance than the current CDM-12 movement. No matter what kind of playback is played, All types of music can embody and master the characteristics and connotation of music, and accurately capture every note. Although CDM-4 has been discontinued, many audiophiles still have a good impression of it. The circuit design of this machine is simple and reliable. The digital-to-analog converter uses Philips' SAA7220 "bit stream", which is slightly lower than the Marantz CD-17KI's SAA7323. The analog output uses 5534OP for amplification, and the capacitor is a Nichicon high-end Muse model. The machine has coaxial and optical fiber digital outputs. The actual sound effect of the AMC CD6 player is significantly higher than the given performance parameters. The reproduced sound is mellow and sweet, the sound bottom is warm and sweet, the vocals are relaxed and dense, the orchestral performance is glossy, and the percussion dynamics are excellent. In addition, it is reasonable The price also makes audio enthusiasts excited. However, this cost-effective CD player has been discontinued and is no longer available in the market, which is a pity.

Main technical parameters

Frequency response: 20Hz-20kHz±0.5dB; signal-to-noise ratio: 95dB; dynamic range: 90dB; channel separation: 90dB; harmonic distortion: 0.003%; overall dimensions: 430mm×112mm×288mm.

Market reference price: 3,200 yuan.