12 channel DSP test report of Japan addzest mxr900: multi ch
Author：远道 Date：2021-04-05 Browse：
To cope with the growing demand for car-mounted feverish audio systems with more and more sound roads, audio processors in car audio support 16 ways of play, from 4-6 common paths in the early days to 12 paths to high-end processors.These signals have been optimized by audio processors, mostly using RCA as the output interface. Competition-level multichannel processors have up to 12 RCA ports on one side.For beginning audio players, 12 RCAs aggregate on one side of the body already have a very strong visual impact. If a professional audio processor has six sets of 12-channel optical independent signal output ports in addition to 12-channel RCA output, what is the visual impact?
The layout of 12 RCA+12 optical signal ports is considered by Xiaobian as if only a few amphibious attack ships can drop down and encounter aircraft carriers capable of arranging dozens of fighters to work, which gives him great impression.The latest MXR900 12-channel audio processor introduced by ADDZEST, Japan, is exactly the application of the above design.And the R&D team is also building the foundation for the future development of in-vehicle audio technology to play with all-digital, high-quality signals.
New design rarely seen by old birds?
The innovative design of mxr900 will definitely make many senior fever veterans and car audio veterans feel fresh. They have seen many professional DSPs, and many groups of digital signal processors such as mxr900 are very rare in the market. Xiaobian thinks that mxr900's forward-looking design, with 1 group of coaxial + 3 groups of optical fiber signal input, 6 groups of 12 independent optical fiber signal output, is designed for the future development of audio technology. Germany's well-known power amplifier brand has launched a pure post stage fever power amplifier supporting optical fiber signal input. With the formation of this design climate, the mxr900's independent optical fiber output transmits audio signal, that is, the whole sound system can realize full digital signal transmission from the host processor power amplifier. The high fidelity, anti-interference and high-definition resolution of sound quality will be further enhanced Times.
德系纯后级功放支持光纤信号直入
Play with three sound sources in one machine
There are multiple signal modes available in the input design. It is easy to see from the configuration of RCA port that mxr900 is an 8-in-12-out design, which can enrich the matching play of multi-channel active and passive systems. RCA port is compatible with high-level, low-level and balanced signal input. There are two groups of independent buttons on the right to control the high-level and low-level input modes of 1-6 channels and 7-8 channels respectively. The GND button on the lower left can control the switching between high-level and low-level and balanced signal. When GND is off, balanced signal input is used. The machine start-up mode can also be used in sound source signal, power supply signal and REM signal There are many ways to choose. It is worth noting that on the left side are a group of (two channel) optical fiber and coaxial signal input ports; on the left side are two groups of (four channel) independent optical fiber signal input ports, which can respectively connect 1, 2, 3, 4 channel or front sound field and rear sound field digital signals. In other words, the input of mxr900 can support three different signal combinations at the same time. For example, RCA terminal can be connected with the original car signal; the optical fiber coaxial in the middle can be connected with the digital player; while the independent optical fiber input can be connected with the sound source host with independent optical fiber output; the whole sound system can switch among the three sound source signals at any time to realize the selection of multiple sound source signals and create an A-B system- C source contrast listening space.
Independent control of 1-6 channel and 7-8 channel signal mode
Multiple groups of independent optical fiber signal input can be switched to balanced signal input mode by sending GND
Six sets of 12 independent optical fiber signal output
In terms of design, addzest of Japan has also carried out a new optimization development for mxr900, with matte black aluminum body, irregular arc surface design and hollow groove layout of heat sink. Above the front is the eye-catching mirror design product logo, printed with product signal input method for user reference.
Powerful audio processing capacity does not emphasize stacking, but high-end components are essential. The mxr900 of addzest in Japan adopts the four chip architecture which is rare in the industry at present, and four 32bit dual core CPU chips are used for processing. The sampling rate is 96KHz, and the sampling rate can reach 192Khz by using fiber coaxial channel. From the internal circuit design point of view, double-layer architecture circuit design, using high-end American Lingyun logic, high-quality audio capacitor and so on. The high-power transformer adopts all metal package, which has the advantage of excellent shielding effect. The power signal will not affect the sound source signal, and has little interference. Let the distortion of audio signal output be controlled at < 0.01% (low level) and < 00001% (optical fiber). At the same time, the low-level RCA output voltage has a stable 8V boost output, which can be said to be a sharp tool to tap the ultimate potential of loudspeakers.
From the perspective of tuning software, Japan's addzest mxr900, as an aircraft carrier level audio processor, is simple and easy to use for user scenarios. The interface visually displays the transmission signals of analog signal, fiber-optic two channel, fiber-optic four channel, coaxial and external Bluetooth 5.0; supports the joint debugging of left and right channels, 8 channels of high, low level and balanced signal input, supports the mixing function, and can also use the straight through mode; the filter range is 20Hz-20KHz, optional Butterworth, Bessel and link, and the slope is from 6dB / OCT to 48dB /OCT can be selected or turned off; open the sound source setting panel to have more intuitive channel signal operation control, and select the position, volume and positive and negative phase operation of each channel speaker; then click the distribution view to generate the compartment speaker setting panel, which can be tuned from 0ms-14.71ms to 0.03ms; channel EQ equalization has two modes: parameter EQ equalization and graphic Eq, Frequency in the range of 20Hz-20KHz, accuracy of 1Hz, gain of - 12dB to 12dB, accuracy of 0.1dB, Q value of 0.4-10 optional;
Comments: pure digital signal beautiful sound aircraft carrier is coming
There is no doubt that car audio refitting has accelerated into the era of high-quality lossless digital sound source. The mxr900 12 channel pure DSP processor is for the precise tuning of professional audio system. Addzest of Japan hopes that users can rest assured that the tuning will be handled by a professional team. At the same time, addzest also expresses the delicacy and purity of Japanese products. The design is bold, avant-garde and simple, the materials are not ambiguous, and the fever lies in the details. In particular, we can boost the output voltage to 8V, which means that in addition to the sound field accuracy, we should also emphasize the best sound quality of the loudspeaker. Good sound quality is the magic weapon of the professional processor.
Japan addzest mxr900 12 channel audio processor / input / output mode: 8 in 12 out / input impedance: 45 Ω (high level) / optical fiber input: one group (two channels), two groups (four channels) / input voltage: 9V (high level), 4V (low level) / output voltage: 8V (low level) / optical fiber output sampling: 96KHz / low level output distortion: < 0.01%/ Optical fiber output distortion: < 0.0001%
