- Brand Name: weiliang audio
- Certification: NONE
- Origin: CN(Origin)
- Maximum Power Per Channel: NO POWER
- Model Number: PCM56
- Package: Yes
- Channels: 2 (2.0)
Clear and transparent sound surpasses TDA1541's PCM56 dual parallel classic fever decoder board
The performance characteristics and reputation evaluation of classic decoding chips are as follows:
Common DAC chips are mainly divided into two camps, Multi BIT (MULTI BIT) and 1BIT.
In the past, the main manufacturers of multi-bit were BB, ADI, and PHILIPS. SANYO, but now PHILIPS and ADI
It also switched to 1BIT, and SANYO didn’t see anything good, only BB was supporting it.
1) The common DAC chips of BB company are:
The 16BIT PCM56 is mainly used in most high-end CD players. The initial product pays more attention to the sound of the product. It is a relatively high starting point. However, the early product has been passed down less and not many people know it, so it is submerged in TDA1541 is king in the flood of public opinion
18BIT PCM58, which was used extensively on mid-range CDs before, has good performance and attractive sound.
20BIT PCM63, this should be BB’s most classic DAC chip, with excellent performance indicators and
Nice listening experience. It is always seen on many previous high-end machines. Unfortunately later
20BIT PCM1702, this is a product used by BB to replace PCM63. Has better performance than PCM63
Indicators, but I don’t know the reason. Many people prefer to like the sound of PCM63.
Willing to accept the sound of PCM1702, personal estimation may be that PCM63 is easier than PCM1702
Get a thick and warm voice.
The 24BIT PCM1704 and the upgraded product of PCM1702 also use the same internal structure of PCM1702, with more
Higher resolution and dynamics have naturally become the mainstream DA chip for high-end models.
PCM1702 and PCM63 and PCM1704
They all use the unique COLINEAR structure of BB, which uses two
A 19-bit DAC is responsible for the positive and negative half-cycle signals, and then outputs the current of the DAC
Part 2 is combined into one, this structure not only has the high dynamic characteristics of multiple Bit DACs, but also more successful
The problem of zero-crossing distortion that appears on the general multi-bit DAC is solved, and the output
Linearity is improved.
There is also the PCM67 of BB's hybrid design. This is a dual-channel 18BIT chip. It is in 18BIT signal
After input, the 18BIT signal is immediately divided into two parts: 10BIT and 8BIT. The higher 10 BITs are
Multi-BIT DAC conversion, the lower 8BIT is converted by 1BIT, and finally the two parts of the analog signal are added
Output. This design uses 1BIT to solve the problem of zero-crossing distortion, while maintaining the high dynamic advantages of multi-bit. In design
The concept is extremely clever.
Most of BB’s DAC chips are usually divided into three levels, namely: standard P suffix, higher level PJ suffix,
The PK suffix of the highest level has exactly the same internal structure but slightly different performance.
2) AD1862 of Analog Devices,
This is a 20BIT DAC chip produced by Analong Devices. The signal/noise ratio of AD1862 is very good.
In the state of two external bypass capacitors, the signal/noise ratio can be as high as 119dB, and the resolution of 20BIT
It also has a dynamic range of 120dB. A typical application is DENON's DG2560.
AD1862 is divided into two grades: AD1862N and AD1862N-J…
3) PHILIPS' TDA1541 and TDA1543
TDA1541 and TDA1543 are both 16BIT DAC chips. Perhaps, TDA1541 can be called the king of 16BIT chips.
Its excellent THD+N performance indicators can't even catch up with many so-called 18BIT DAC chips. Especially it can be connected externally
The step-by-step approach has become a favorite for DIY players to adjust their sound. I am very dissatisfied with its high-frequency resolution ability.
MARANTZ and PHILIPS are the main users of the DAC chip, especially MARABTZ even uses it on its advanced CD.
TDA1543 is also a 16BIT DAC with only 8 pins, which can be regarded as a very simple DAC chip. But its high frequency distortion
It can be regarded as terrible. TDA1543 has TDA1543A with A suffix and TDA1543 without TDA1543, these two models
The accepted data format is different and cannot be replaced directly. They are: TDA1543A accepts MSB 16BIT data
Signals cannot accept the IIS data format. The TDA1543 only accepts the IIS data format.
There are 4 types of TDA1541, the ranks from low to high are: TDA1541A, TDA1541A/R1, TDA1541A/S1,
TDA1541A/S2, their performance data are different, which are mainly shown in the THD+N distortion at S/N and -60DB,
These 4 models only accept IIS data format.
4) SANYO's LC7881 and LC78820, LC7881 is 16BIT, and LC78820 is 18BIT, the previous generation is cheap
The DAC chip used by CD player CEC891 is LC78820. The LC7881 is mostly used in cheap machines, and its performance is not
PCM56 is good.
It can be seen from the above evaluation and analysis that PCM56 as an early product does not lose its reputation as the TDA1541 chip that people talk about. Today, when only parameters are used to make final conclusions on products, there are still many experienced hobbyists who will turn the clouds and see the fog. Through the comparison of new and old products, we find that we are pursuing the artistic conception of listening. That is, the sound expressiveness and flavor of a decoding circuit. The parameter is just a reference indicator! In addition to more sound details, higher signal-to-noise ratio and dynamics, DSD does not give people a better listening experience than the earlier low-index decoding circuits. This is why some of the old decoding circuits on the market have not disappeared but are increasing. The more people go after it.
After a long period of audition and comparison, we feel that the current PCM56 dual-parallel circuit is indeed better than TDA1541. It is clear and moving, which is the evaluation of netizens. The actual feeling is that there are many details, the sound field positioning is clearer, and the human voice is more rounded, delicate and durable. Not lose the current high-end mainstream circuit at all
PCM56 supports up to 16BIT 48K bit rate signal
This board only has optical and coaxial input ports
The size of the decoder board is 15X20CM
The power supply that needs to be matched is 15VX2+2 groups of 9V AC, and the current of each group is more than 0.3A.
This board uses a new PCM56 chip, not a disassembled product