The design of Musetec's new flagship DAC mh-da005 has condensed Musetec's more than 10 years of experience in the decoder field. The overall development process took one and a half years.
The original design intention of DA005 is to produce a DAC whose sound, appearance and process level are higher than those of DA004, rather than the optimization and update of DA004. Different design objectives have established the level gap between DA005 and DA004.
In order to achieve this goal, the motherboard has been proofed for 6 times, the power board has been proofed for more than 20 times in different replacement schemes, and dozens of spare parts have been tested.
1、 Newly designed power supply system
The power supply in the sound system is extremely important. We have designed an advanced power regeneration system for DA005, which is like two storage ponds. When one group discharges water, the other group stores water, and the cycle alternates. Under the well-designed control logic, the storage and discharge are completely isolated and do not affect each other, so the impact of mains noise on the main circuit of DAC can be avoided to a great extent. On the other hand, the circuits powered by the traditional iron core power transformer have the problem of poor load adjustment rate, which leads to the dynamic compression of sound and insufficient density. The new power supply system does not have this problem. The quiet, abundant and high-quality energy supply DAC circuit can replay the most authentic sound.
In the DAC power supply circuit, we use a large number of industry-leading high-performance low-noise regulators from Lingte linear, Ti and other companies to ensure that each functional circuit has an independent two-level voltage stabilizing supply, providing pure static and sufficient energy for each part of the circuit. A total of 18 independent regulators were used.
The power supply of analog circuit is also very important. We have specially customized an O-type transformer. The primary and secondary windings are made of expensive single crystal copper silver plated material. Due to the skin effect of AC, the current basically flows through the silver layer on the surface. Compared with copper wire and oxygen free copper wire transformers, the sound is essentially different, more quiet, pure, delicate and full, and the transient response is more excellent (compared with the same conditions). In addition, it is sealed with high-strength stainless steel shield to resist mechanical vibration and realize electric field shielding. The newly designed analog power supply circuit adopts high current and low internal resistance power MOS as the regulator in the circuit structure, and twin discrete components form a voltage feedback control circuit to achieve very low output internal resistance and very low power supply noise. It can provide fast and sufficient output response in all frequency bands of analog output circuit.
The rectifier diode adopts silicon carbide Schottky diode without recovery time. The main filter capacitor is a mundorf non inductive electrolytic capacitor, and the output capacitor is an audioote fast clear non-polar capacitor with mundorf supreme capacitor for high-frequency compensation.
The reverse recovery time of SiC Schottky diodes approaches zero, the switching speed of on and off states is very fast, and there is no reverse recovery current when ordinary bipolar diodes enter the switch. Because of the existence of reverse recovery current, the gap between cut-off and on will produce very large pulse spikes in the traditional silicon-based or germanium based bipolar diodes in the switching rectifier circuit, which will directly interfere with the performance of the back-end circuit. As a result, the sound is rough and burry. The silicon carbide diode is much more stable and smooth, and the sound texture and details are more prominent. In terms of cost, silicon carbide diode is more than 10 times that of ordinary Schottky diode.
2、 Analog output line
The analog output circuit of DA005 adopts the newly designed full discrete component circuit. The advantage of discrete components is that the single diode and triode with excellent characteristics can be selected, and the sound is more comprehensive than the integrated operational amplifier. DA005 uses a large number of twin JFETS and twin triodes, and the circuit has higher accuracy. Both balanced output and single ended output have the same LPF low-pass filter circuit. DA005 adopts small volume, low-temperature drift (no more than 5ppm) and high-precision (0.01%) non inductive resistance, making the sound more vivid and fax.
Single end output terminal, we use customized high conductivity tellurium copper gold-plated RCA plug, Teflon inner core, and Duran gold silver alloy wire for lead out.
High conductivity tellurium copper alloy. Its main excellent properties are introduced: 1) it has very high conductivity. The conductivity of tellurium copper alloy is 94%-98%, gold is 65 ~ 75%, rhodium is 35%, and brass with high copper content is 28%; 2) It has high thermal conductivity. 22% more than pure silver and 28% more than red copper; 3) Good arc resistance.
In the analog circuit, there are also two particularly important capacitors. We compared a variety of expensive copper foil, silver foil, gold and silver foil, oil immersed and other capacitors, and finally chose German GAD gold and silver foil capacitors. Compared with GAD gold and silver foil capacitors and mundorf flagship gold and silver foil oil immersed capacitors, GAD gold and silver foil capacitors have more solid internal materials (from the manufacturer's introduction), fuller full frequency, higher density, richer details and stronger texture. GAD gold silver foil capacitors are also more expensive.
3、 Clock system
The DA005 complete machine (including USB circuit) uses four high-performance clocks, and its quality exceeds that of Crytek cchd957 and cchd575 series widely used in high-end computers.
Taking the 24.576mhz in cchd957 series as an example, the most critical sideband noise of 10Hz at the near end is -97.9db √ Hz, and the customized clock of DA005 is -108.6db √ Hz, with a noise reduction of nearly 10dB. The direct benefit is that the sound is more natural and accurate. (compared with external conditions)
4、 Auxiliary material design
The internal wiring of DA005 uses a large number of high-purity Jensen pure silver wires. Compared with 7n single crystal copper wire, pure silver wire has higher sound density, and more excellent details, texture, sound field, permeability and smoothness.
The single end output terminal of DA005 is connected with tellurium copper alloy and Duran gold silver wire.
5、 Built in high-performance USB interface
Specially designed high-performance USB interface, Italy amanero scheme, four layer board design. Using multi-channel low-noise power supply, three excellent low sideband noise clocks (better than Crytek cchd957). The high-speed isolator can isolate the ground wire of the computer by 3KV. Make the sound more pure.
In USB access mode, PCM and DSD decoding are supported. PCM supports 44.1k~384k bit rates. DSD supports dsd64, dsd128, dsd256 and dsd512.
For the setting mode of USB drive and computer player, please refer to the documentation in the USB drive attached to the machine.
6、 Main parameters
Decoding chip es9038pro x 2
Input channel: USB, coaxial 1, coaxial 2, optical fiber, aes/ebu, i2s-e, i2s-h
Single ended RCA output level 2Vrms
Balanced XLR output level 4vrms
Digital volume attenuation function, with 0.5dB interval attenuation, can be skipped
Digital filtering mode optional
Digital PLL DPLL settable
DSD channel switching function that can be set
De emphasis function that can be turned on and off
DOP (DSD over PCM) receiving function that can be turned on and off
USB supports pcm44~384k, dsd64~dsd512
I2s-e and i2s-h support pcm44~pcm384k, dsd64~dsd512 and dop64x
Coaxial, optical fiber, aes/ebu support pcm44~pcm192k, dop64
Full function remote control with remote standby function
VFD display screen with multi gear brightness adjustment and automatic screen stop
Dynamic range >136db
Distortion <0.0002%
Stereo resolution >120db
Frequency response 0~20khz ± 0.2db
Rated power 25W
Size 430*350*78mm (width * depth * height), height including machine feet
Net weight of the machine: 9.0kg
Power supply voltage 100~120v or 200~240v optional
7、 Summary of characteristics:
Muconic advanced regenerative power supply system, supplemented by precise power supply monitoring circuit
Up to 18 high performance low noise regulators
Four very low sideband noise clocks
O-type single crystal copper silver plated cow
New analog power circuit structure
Silicon carbide diode without recovery time
Mundorf main filter capacitor, audioote fast clear electrodeless capacitor, mundorf supreme capacitor, GAD gold silver foil capacitor, MIT capacitor
8 groups of discrete individual circuits provide fully balanced and single ended output, fully discrete design, twin tube, low temperature drift 5ppm non inductive resistance
Tellurium copper plated Teflon core RCA output terminal with Duran gold silver alloy lead
In machine Jensen Sterling Silver wiring
Guhe fi-03g power tail plug
The motherboard is designed with six layers of sinking gold plate
High grade aluminum chassis
Large size VFD display
8、 Sound characteristics
The decoder is a part of the sound source in the sound system. It is very critical to grasp the lifeline of sound in the whole system. Reasonable cognition is that the sound source needs to be neutral and accurate, and Z is close to the nature of recording to a large extent, so that it can give full support to the faithful playback of the back-end system. Therefore, the design and adjustment of DA005 also adhere to the characteristics of neutral and neutral. Due to the new circuit architecture design and the generous selection of materials, the sound texture, density, sound field, level, transparency, fineness, smoothness, detail Compared with 004, micro dynamics has significantly improved. In a strict sense, it has crossed several levels, showing a high level in terms of sound and musicality, and has a comprehensive and true expression of various types of music. Especially for the improvement of the intermediate frequency band, it can be said that the es9038 has the characteristics of texture but not full and emotional sound.
9、 Packing list
Remote control
American standard power cord
USB line
T2 hexagon socket screwdriver (used to remove the remote control and replace the battery)
USB flash disk (including electronic manual, the machine will not provide paper manual)
warranty card
