MH-DA005 DAC
购买
    沐声新款旗舰解码器MH-DA005的设计,凝结了沐声在解码器领域10多年来的经验,总开发过程历时一年半。
    DA005的设计初衷是希望能制作一款声音、外观、工艺水准均高于DA004的DAC,而并非是DA004的优化更新。设计目标的不同,确立了DA005与DA004之间的层次差距。为了达成这一目标,主板累计打样6次,电源板更换不同方案打样累计20余次,测试使用的零配件数十种。
一、全新设计的电源系统
    音响系统里的电源,极其重要。我们为DA005设计了高级电源再生系统,犹如两个蓄水塘,一组放水的时候另一组蓄水,循环交替。在精心设计的控制逻辑下,蓄、放是完全隔绝的,互不影响,从而可以在很大程度上避免市电杂讯对DAC主电路的影响。而另一方面,由于使用传统的铁芯电源变压器供电的电路都存在负载调整率差的问题,进而导致声音动态被压缩,密度不足,新的电源系统则不存在这种问题,安静、充沛、高素质的能源供给DAC电路,可以重播出最为真实的声音。
    DAC供电电路中,我们大量使用了凌特Linear、德州仪器TI等公司领先业界的高性能低噪声稳压器,保证到每一个功能电路都有独立的二级稳压供给,为各部分电路提供纯静、充足的能量。总计使用了18颗独立稳压器。
    模拟电路的供电同样非常重要,我们特别定制了一颗O型变压器,初级、次级绕组均采用昂贵的单晶铜镀银材质,由于交流电的集肤效应,电流基本都是从表面的银层流过,对比铜线、无氧铜线变压器,声音有着本质的区别,更为安静、纯透、细腻、饱满,瞬态反应也更为优秀(同条件对比)。另外辅以高强度不锈钢屏蔽罩进行密封,可抗机械振动,实现电场屏蔽。全新设计的模拟电源电路,电路结构上采用大电流、低内阻的功率MOS做调整管,孪生分立元件组成电压反馈控制电路,实现极低的输出内阻和极低的电源噪声。在模拟输出电路工作的全频段都能提供快速、充沛的输出响应。
    整流二极管采用无恢复时间的碳化硅肖特基二极管。主滤波电容选用Mundorf 无感电解电容,输出电容选用Audionote 快晴无极电容配Mundorf Supreme电容进行高频补偿。
    碳化硅肖特基二极管的反向恢复时间趋近于零,导通与关断状态的转换速度非常快,而且没有普通双极二极管进入开关时的反向恢复电流。 传统硅基或者锗基双极二极管在开关整流电路中,因为反向恢复电流的存在,截止和导通的间隙会产生非常大的脉冲尖峰,直接干扰后端电路的性能。导致声音粗糙有毛刺感,碳化硅二极管则安定顺滑很多,声音的质感和细节也更突出。成本上,碳化硅二极管是普通肖特基二极管的10倍以上。
二、模拟输出线路
    DA005的模拟输出线路采用新设计的全分立件电路,分立件的好处是可以选择特性优异的单体二三极管,声音比集成运放更为全面。DA005大量使用孪生JFET和孪生三极管,电路的精度更高。平衡输出,单端输出都有同样的LPF低通滤波电路。DA005全部采用了小体积、低温漂(不大于5ppm)、 高精度(0.01%)的无感电阻,声音更为生动、传真。
    单端输出端子,我们使用定制的高导碲铜镀金RCA插头,特氟龙内芯,辅以杜兰金银合金线做引出。
    高导碲铜合金,介绍其主要优良性能:1)具有很高的导电性能,碲铜合金的电导率94%-98%,金 65 ~ 75%,铑 35%,高铜含量的黄铜 28%;2)具有很高的热导率。超出纯银22%,超出紫铜28%;3)抗电弧性好。
    在模拟线路中,还有两颗特别重要的电容,我们对比了多种昂贵的铜箔,银箔,金银箔,油浸等电容,最终选用了德国GAD金银箔电容,对比GAD金银箔电容和Mundorf 旗舰的金银箔油浸电容,GAD金银箔电容具有更扎实的内部用料(来源于厂家介绍),更为饱满的全频,密度更高,细节更丰富,质感更强烈。GAD金银箔电容的价格也更为昂贵。
三、时钟系统
    DA005整机(包括USB电路),使用了四颗高性能时钟,质素超过高端机广泛使用的Crystek CCHD957 和CCHD575系列。
    以CCHD957系列中的24.576MHz为例,最为关键的近端10Hz的边带噪声是-97.9dB√Hz,DA005的定制钟是-108.6dB√Hz,有近乎10dB的噪声降低。带来的直接好处是声音更自然,精准。(同外部条件对比)
四、辅料设计
    DA005的内部接线,大量使用了高纯度的Jensen纯银线。对比7N单晶铜线,纯银线有着更高的声音密度,细节、质感、音场、通透度、润度等更为优秀。
    DA005的单端输出端子使用碲铜合金配杜兰金银合金线连接。
五、内置高性能USB界面
     特别设计的高性能USB界面,意大利Amanero方案,四层板设计。使用多路低噪声电源,三颗非常优秀的低边带噪声时钟(优于Crystek CCHD957)。高速隔离器,可对电脑地线做3KV隔离。让声音更纯净。
    在USB接入模式下支持PCM和DSD解码,PCM支持44.1K~384K各种码率,DSD支持DSD64、DSD128、DSD256、DSD512。
    USB驱动以及电脑播放器的设置方式请参考整机附带的U盘内文档。
六、主要参数
解码芯片ES9038pro X 2片
输入通道:USB、同轴1、同轴2、光纤、AES/EBU、I2S-E、I2S-H
单端RCA输出电平 2Vrms
平衡XLR输出电平 4Vrms
数字音量衰减功能,以0.5dB为间隔衰减,可以跳过
数字滤波模式可选
数字锁相环DPLL可设置
可以设置的DSD声道交换功能
可以开启、关闭的去加重功能
可以开启、关闭的Dop(DSD over PCM)接收功能
USB支持 PCM44~384K,DSD64~DSD512
I2S-E、I2S-H支持PCM44~PCM384K、DSD64~DSD512,Dop64x
同轴、光纤、AES/EBU支持PCM44~PCM192K,Dop64
全功能的遥控器,有遥控待机功能
VFD显示屏多档亮度可调,可自动息屏
尺寸430*350*78mm (宽*深*高),高度包括了机脚
机器净重9.0kg
电源电压 100~120V或200~240V可选
七、特性总结:
沐声高级再生电源系统,辅以精密的电源监控电路
多达18路的高性能低噪声稳压器
四颗极低边带噪声时钟
O型全单晶铜镀银牛
全新的模拟电源电路结构
无恢复时间的碳化硅二极管
Mundorf主滤波电容,Audionote快晴无极电容,Mundorf Supreme 电容,GAD金银箔电容,MIT电容
8组分立单体电路提供全平衡和单端输出,全分立设计,孪生对管,低温漂5ppm无感电阻
碲铜镀金特氟龙心RCA输出端子,配杜兰金银合金引线
机内Jensen纯银接线
古河FI-03G电源尾插
主板采用六层沉金板设计
高档铝机箱
大尺寸VFD显示器
八、声音特性
    解码器属于声音系统里的音源的一部分,在整个系统中把握着声音的命脉,可以说极为关键。合理的认知是,音源需要中性准确,z大限度的接近录音本质,这样才可以给后端系统的忠实重放以鼎力支撑,因此,DA005的设计调校也是坚持中性中正的特质,由于采用了新的电路构架设计以及毫不吝啬的选料,005的声音质感、密度、音场、层次、透明度、细腻度、润度、细节、微动态等都相对于004有显著的提升,严格意义上说,是跨越了几个级别的提升,在音响性和音乐性上都表现出高水准,对各种类型的音乐都有全面真实的表达。特别是对于中频段的提升,可谓一扫ES9038有肌理却不饱满、无感情的声音特质。
九、包装清单
遥控器
美标电源线
USB线
T2内六角螺丝刀 (用于拆卸遥控器更换电池)
U盘(包含电子档说明书,本机不再提供纸质版本的说明书)
保修卡
The design of the new flagship MH-DA005 hi-end DAC condenses our 10 years experience. The total development process takes one and a half years.
DA005 was designed to produce a DAC with sound and appearance much higher than DA004, not an optimized update to DA004.Different design goals establish the hierarchical gap between DA005 and DA004.
To achieve this goal, the mainboard has been modified 6 times, the power board has been modified 20 times, and dozens of parts have been tested.
1. Newly designed super power system
The power supply in the audio system is extremely important.We have designed an advanced power regeneration system for DA005, which is like two reservoirs, one storing water while the other storing water alternately.Under the carefully designed control logic, the storage and charge are completely isolated and do not affect each other, thus to a big improvement of avoiding the AC noise on the DAC.On the other hand, due to the problem of poor load regulation rate in all the circuits powered by traditional iron core power transformer, the sound dynamic is compressed and the density is insufficient. This problem does not exist in the new super power system. Quiet, abundant, high-quality energy-supplied DAC circuits can replay the most realistic sound.
In the DAC power supply circuit, we use a large number of high-performance low-noise regulators from Linear, TI and other companies leading the industry, ensuring that each functional circuit has its own secondary regulator supply, providing pure and sufficient energy for each part of the circuit.A total of 18 independent regulators have been used.
The power supply of analog circuit is also very important. We have specially customized a silver-plated OCC transformer. The primary and secondary windings are made of expensive OCC-plated silver. Because of the skin effect of signal, the current basically flows through the silver layer on the surface. Compared with copper wire and OFC (oxygen-free copper) wire transformers, the sound is essentially different. It is quieter, transparent, delicate, full and transient. In addition, it is sealed with high strength stainless steel case, which can resist mechanical vibration and achieve electric field shielding.The newly designed analog power supply circuit uses power MOSFET with high current and low internal resistance as regulator, and twin transistors form a voltage feedback control circuit to achieve very low output internal resistance and very low power noise.Fast and abundant output response can be provided in the full audio frequecy band of the analog output circuit.
We use silicon carbide Schottky diode with no recovery time as power rectifier diodes. The Mundorf inductance-free electrolytic capacitors are used for the main capacitor, and the Audionote Kaisei nonpolar capacitors and Mundorf Supreme capacitors are used for high frequency compensation.
The reverse recovery time of the SiC Schottky diode approaches zero, the transition between on and off state is very fast, and there is no reverse recovery current.Traditional silicon or germanium-based bipolar diodes in switched rectifier circuits have very large pulse spikes due to the presence of reverse recovery current, which directly interferes with the performance of the circuit, the sound is rough and burry, while the silicon carbide diode is much smoother and more stable, and the texture and details of the sound are more prominent.The cost of a silicon carbide diode is more than 10 times that of an ordinary Schottky diode.
2. Analog Output Stage
The analog output stage of DA005 uses a newly designed fully discrete circuit. The advantage of the discrete circuit is that it can select a single triode with excellent performance and that the sound is more comprehensive than the integrated operational amplifier.DA005 uses a large number of twin JFETs and twin trasistors, the circuit accuracy is higher.Balanced output, single-end output have the same LPF low-pass filter circuit.DA005 uses small size, low temperature drift (no more than 5 ppm), high precision (0.01%) non-inductance resistance, more vivid sound.
We use customized gold-plated RCA plug with high-conductivity tellurium alloy, Teflon core, and Duelund silver wire.
The main good properties of high conductivity tellurium alloy are:
1) It has high conductivity, the conductivity of tellurium alloy is 94%-98%, gold 65-75%, rhodium 35%, brass 28% with high copper content;
2) It has high thermal conductivity.Over 22% pure silver and 28% copper;
3) Good arc resistance.
In the analog circuit, there are two particularly important capacitors. We compared a variety of expensive capacitors, such as copper foil, silver foil, gold and silver foil, oil immersion capacitor, and finally selected the GAD gold and silver foil capacitor.
3. Clock System
The DA005 (including USB part) uses four high-performance clocks, which are superior to the Crystek CCHD957 and CCHD575 series, which are widely used in high-end machines.
Taking 24.576MHz in CCHD957 series as an example, the most critical near-end 10Hz SSB noise is -97.9dB√Hz, DA005 custom clock is -108.6dB√Hz, with nearly 10dB noise reduction.The benefit is that sound is more natural and accurate.
4. Design of Supplementary Materials
We use a lot of high-purity Jensen silver wires for internal connection.Compared with 7N OCC wire, pure silver wire has higher sound density, details, texture, sound stage, transparency, moisturization and etc..
5. Built-in high performance USB interface
Specially designed high performance USB interface, four-layer design.With a multi-channel low noise power supply, three very good low sideband noise clocks (better than Crystek CCHD957).High speed isolator for 3KV isolation of computer ground .Purer sound.
PCM and DSD decoding are supported in USB access mode, PCM supports 44.1K~384K various bit rates, DSD supports DSD64, DSD128, DSD256, DSD512.
6. Main parameters
ES9038pro X 2
Input channels: USB, coaxial 1, coaxial 2, optical, AES/EBU, I2S-E, I2S-H
Single-ended RCA output level 2Vrms
Balance XLR output level 4Vrms
Digital volume attenuation function, attenuated at 0.5dB steps, can be skipped
Different digital filter mode
DPLL Settable
DSD channel swap function
De-emphasis function that can be turned on or off
DOP (DSD over PCM) Receive Function that can be turned on and off
USB supports PCM44~384K, DSD64~DSD512
I2S-E, I2S-H support PCM44~PCM384K, DSD64~DSD512, Dop64x
Coaxial, optical, AES/EBU support PCM44~PCM192K, Dop64
Full-featured remote control with remote standby function
VFD display with adjustable brightness and auto-off
7. Summary of characteristics:
Musetec Advanced Regeneration Power System
High performance low noise regulator up to 18 channels
Four Ultra Low SSB Noise Clocks
O-type silver plated OCC transformer
New analog power circuit structure
Silicon Carbide Diode without Recovery Time
Mundorf Major Filter Capacitor, Audionote Quick Clear Polar Capacitor, Mundorf Supreme Capacitor, GAD Gold and Silver Foil Capacitor, MIT Capacitor
8-group discrete monomer circuit provides full balance and single-end output, full discrete design, twin-pair tube, low temperature drift 5ppm non-resistor
Tellurium-plated gold Teflon core RCA output terminal with Duran gold-silver alloy lead
In-machine Jensen Silver Wiring
Furutech FI-03G IEC accerssary
Six layers Main board
High grade aluminum chassis
Large VFD Display
8. Sound characteristics
DAC is the most important part in a Hi-Fi system. Reasonable recognition is that the sound source needs to be neutral and accurate, to support the faithful replay of the whole system. Due to the new circuit architecture design and unscrupulous material selection, the sound quality, density, sound field, transparency, detail of DA005 relative to DA004, have a significant improvement. Strictly speaking, it is a promotion that spans several levels, showing a high level in acoustics and music, and having a comprehensive and true expression for all types of music.Especially for the promotion of mid-frequency band, ES9038 has texture but not full, emotionless sound characteristics.
9. Packing List
Remote controller
US Standard Power Cord
USB wire
T2 screwdriver (for removing remote control and replacing battery)
U disk (including instructions, DA005 no longer provides paper instructions)
Warranty card