The appearance design style of Impression II CD player is beautiful and elegant, noble and stable. The upper cover of the aluminum alloy box with octagonal cross-section is covered with a four-petal plum blossom-shaped thick aluminum cover plate, and a dish warehouse with a top open cover is installed in the middle. The four petals are etched with famous patterns: Temple of Heaven, Sydney Opera House, Freedom The goddess and sphinx have a strong and profound cultural atmosphere.
Impression I The octagonal prism in the middle of the CD player is equipped with three layers of circuit boards, from bottom to top are the power supply board, the DAC decoder board and the servo board. The four large cylinders hung around are not only containers for circuits and components, but also large machine legs. Among them, the electronic tube amp circuit board, the electronic tube power amplifier circuit board, and two power transformers are installed respectively. The middle of the first two machine legs is equipped with transparent crystal glass, which transmits blue and red tube light very charming. There are up to 5 structural empty design features and test Zhongshen Impression II CD player room, each with corresponding circuit boards and components, and each other The interval eliminates electromagnetic interference, which is conducive to the improvement of sound quality. The 23kg mass created by each independent box with high rigidity is conducive to the stable reading of information by the laser head.
Impression II CD player has sophisticated circuit design and excellent selection of components. The circuit has an upscaling function, which can increase the standard sampling frequency and quantization accuracy of 44.1kHz/16bit of CD to the highest specification of 192kHz/24bit, so that the fineness and clarity of the sound can be significantly improved. Users can choose different sampling frequencies and quantization at will Accuracy to obtain different sound effects.
Each of the two channels uses a PCM1794 chip of BB Company for digital/analog（D/A）Conversion. The sampling frequency of PCM1792 is 192kHz/24bit, which combines the advantages of high-speed operation and low time base error. Using advanced segmentation technology, the maximum dynamic range is 132dB（Mono mode）, To make the sound closer to the original recording source. Super high analytical power and realistic sound performance make it the darling of almost all current high-quality CD players.
Impression II CD player decoder board
The decoded analog signal enters the I/V conversion circuit. Here, BB’s OPA2604 and OPA604 chips are used for I/V conversion and low-pass filter output. The signal output includes all forms. The digital part has coaxial, optical and AES/EBU balanced outputs, and the analog part has FET and electronic tube outputs. Of course, balanced output terminals are indispensable. In addition, there is a headphone output amplified by the tube and a volume adjustment knob.
The power supply design is very elegant. Two R-type transformers supply power to the digital circuit and the analog circuit respectively, and the filter capacitors total more than one hundred thousand microfarads, so as to obtain a ripple-free pure DC power to reduce the interference to the signal waveform. The tube used for the amp is two Russian EL84EH, and the power amplifier tube is also Russian 6922EH. These are very good devices.
Zhongshen Audio is probably the manufacturer with the most product categories in China. Speaking of amplifiers, there are two-channel, multi-channel, transistor tubes and other varieties. In addition, there are still CD players, SACD players, radio heads, etc., so an all-round remote control is needed. In this way, all products produced in 2008 can be controlled by one device. For example, it can control dual-channel amplifiers, multi-channel amplifiers, CD players, DVD player radio heads, etc., just click the switch button.
Impression II CD player is divided into two versions, luxury and standard. The former uses mirror-finished stainless steel as the top plate, while the latter uses a wire-controlled aluminum plate. The internal design, process and materials are the same.
The CD player test can be divided into instrument test and audio test. Instrumentation emphasizes objectivity and is carried out by the manufacturer. The measured technical indicators are often published in manuals and advertisements. The audiometry is based on the human ear, which is subjective. It is not only an important means for manufacturers to improve and debug their products, but also the main basis for users to purchase.
Impression Ⅱ CD player servo board
There are two ways to listen to the CD player. One is to properly configure the amplifier and speakers to listen to the evaluation from the system; the other is to take the signal directly from the CD player through headphones. The former is affected by the system collocation, and different collocations will have different feelings. The latter is more able to directly experience the performance of the CD player itself, and should be the main means of listening to the CD player. Therefore, the author mainly used earphones for direct listening testing of the impression II CD player.
The signal source used for audiometry is very important. Here I chose "SUPER AUDIO CHECKCD". This CD records two types of signals: audio test and music test. By the famous German sound engineer Walter Frankfurter（Walter Frankfort）And mastering recording Adalbod Baecker（Bangorb Baker）The recording is completed and the master disk is carved in Germany. The signal and music parts are excellent, and they are absolutely trustworthy test disks.
The headset I chose is SENNHEISERHD650（Sennheiser）Although the earphones are not the best, they are also quite high-end, and the audiometry should be credible.
Impression Ⅱ CD machine bile duct plate
First, perform left and right channel detection. The train comes from the far right and enters the station until it goes to the far left. You can hear a clear sense of distance in the earphones, especially when it disappears to the far left and passing through the station, it has a sense of presence, as if we were standing on a platform. generally.
Use the drum set to detect the positioning, the sound is clearly positioned in the left, left, middle, right, and right, 5 positions, and there is a sense of equal distance in 5 positions.
I am particularly interested in frequency response. When a 20Hz sine signal is input, the buzzing sound from the earphone shows that its low frequency response is very good, and the sound is slightly louder at 31.5Hz, reaching the normal value. At 12.5kHz, the sound becomes smaller, at 16kHz it is even smaller, and at 20kHz it is almost inaudible. The reason is my presbycusis and hearing loss. I let several young people next to listen to them. They all talked about it.“squeaking, uncomfortable”. Shows that the high frequency response is very good. No signal source above 20kHz has not been tested.
Impression Ⅱ CD player power board
In addition, items such as channel separation and signal-to-noise ratio have been tested, which will not be described in detail. The last 10 programs of the CD are used to detect various elements of music. For example, when using the "You Belong to Mine" jazz female voice to detect human voice, we will hear the female voice unnatural and clear, perfectly reproducing the extremely magnetic Sing, use "Sorrow of Love" and "Mazuka" to detect the timbre of the violin and piano respectively. The CD player can accurately reproduce the sound of the instrument and the timbre positioning is top-notch.
In short, the Impression II CD player can be regarded as a simplified version of the flagship Impression CD player. In terms of its appearance, craftsmanship, performance, especially sound performance, it is difficult to match in the same price, even if it takes 20,000 to 30,000 yuan abroad. Comparing with the famous brand-name machines, satisfactory conclusions can also be drawn. If the domestic CD player lacks high-end mid-priced and cost-effective products, then with the impression II CD player, we have a choice.
Impression CD Player II
1. Features
*2 pieces of PCM1794 for digital/analog conversion, each channel uses 1 piece for balanced and single-ended output. OPA604 is used for I/V conversion and low-pass filter output.
*This machine can increase the sampling frequency and quantization accuracy of ordinary CDs from 44.1kHz/16bit to 192kHz/24bit. You can choose different sampling frequencies of 44.1kHz, 96kHz and 192kHz at will to obtain different timbres. *Use field effect tube and electron tube as buffer two-way output, PCM Digital coaxial, optical fiber, AES/EBU output, headphone output.
*The best features of five completely independent spaces and all-aluminum alloy cabinets respectively Equipped with five power supplies and circuit components, it has excellent anti-interference and shock-proof performance.
*Perfect manual flip process.
2. Technical parameters
model“impression” CD player II
Frequency range 2Hz--20kHz
Dynamic Range≥100dB
Distortion coefficient≤0.0010%
Analog output, a set of balanced transistors
A set of unbalanced transistors
A set of unbalanced tubes
Dimensions 430mmX350mmX178mm
There are three versions of Impression CDII CD player:
1. Deluxe Edition:
One set of balanced FET output
A set of unbalanced FET output
One set of unbalanced tube output
Black aluminum alloy chassis + mirror stainless steel panel
2. Standard version:
One set of balanced FET output
A set of unbalanced FET output
One set of unbalanced tube output
Silver white all aluminum alloy chassis
3. Premium version:
One set of balanced FET output
One set of unbalanced field effect tube output
Silver white all aluminum alloy chassis
Frequency range: 2Hz-20KHz
Dynamic Range:≥100dB
Output level: 2V
Signal to noise ratio:≥ 102dB (Field effect tube output)≥ 95dB (tube output)
Distortion factor:≤ 0.0010% (Field effect tube output)≤ 0.0020% (tube output)
Analog output: a balanced (XLR) FET output, a unbalanced (RCA) FET output, and an unbalanced (RCA) electronic tube output.
Digital output: one set of optical fiber (OPTICAL), one set of coaxial (COAXIAL), one set of AEB/EBU.
Dimensions: 430mm×350mm×178mm(L×W×H)
Weight: 23kg（Deluxe Edition） 19kg（Standard Edition） 14kg（Value Edition）
Tips:
1.Receipt must be inspected
When the customer delivers the goods by express delivery or picks up the goods at the freight station,Please be sure to open the box to check whether the goods in the box are damaged, and only after confirming that the goods are not damaged, sign for receipt.If you find that the goods are damaged, please refuse to accept and notify us as soon as possible. We will follow up and give you the best solution as soon as possible. The seller, courier or logistics shall not be responsible for the consequences caused by the customer signing the receipt without inspecting the goods, and the consequences shall be borne by the customer, and I hope to understand.
2.After-sales service
For all the goods sold in our shop, we will provide the following services:product quality problem,One year free warranty. Due to human factors, private disassembly of the machine is not guaranteed.
3. The products sold in this shop do not support 7-day return without reason. If the buyer wants to try it out, please do not shoot, thank you for your cooperation!