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自DA8推出市场，我们就已经开始对这个功能上已臻完善的产品探索进一步提升音质的途径。DA8越是广受好评，我们越是谨小慎微，在经历数年的反复修改试听，并在搭配多套家庭Hi-end器材与专业音频工作室硬件系统之后，再充分参考DA8用户的反馈意见。现在，我们很高兴向新老用户们推出DA8 II，一款基于DA8的完善功能但声音表现有着前所未有的提升的产品。
DA8II充分保留了DA8优良性能，而在其声音风格和细节做了提升，使用了Crystek CCHD-950-25-100的低相位噪声音频晶振，调整了电源供电，LPF电路以及耳放电路，DA8II的声音更饱满、有力度、细节也更丰富，耳放部分也进一步提高了力度和透明度，展现在您面前的是会让您觉得耳目一新的音乐触动。
DA8II使用ESS9018为解码芯片，AD797*5电压基准和低通滤波，OPA1632*2缓冲兼前级放大输出，耳机放大采用钻石缓冲电路，ON音频中功率对管输出，并具有短路保护电路，加拿大PLITRON高品质变压器供电，LT1129/LT3021搭配WIMA薄膜电容组成的纯净的电源供给ESS9018。模拟电路供电使用了松下FC高频低阻、VISHAY BC046、WIMA MKS2、NPO等电容搭配调整至优异的性能和自然的听感。
USB输入使用的是和意大利Amanero合作开发的定制版Combo384，支持DSD和PCM 32Bit 384KHZ，支持Mac OSX、Linux、windows操作系统，有良好系统兼容性。
在试验了多种流行的USB输入方案之后，由于Combo384所特有的自然和耐听的风格，其被继续应用于DA8II上。
功能的操作使用软件控制，2.4寸彩色液晶显示屏显示工作状态，5秒无操作时亮度降低80%，自动记忆用户设置，简单易用的操作。5种滤波器模式和正负相位能组合出各种不同风格的声音，80级可调音量前级输出，可以方便的连接专业有源音箱，纯解码模式下外接功放效果更好，它饶开音量控制、关闭耳机放大供电，完全工作在纯解码状态。
多级的数字信号整型缓冲电路，能充分优化数字信号质量，使用低相位噪声高精度晶振做为主时钟，DPLL锁定带宽自动设置, 抖动消除器可以开关控制，让它既可以锁定劣质的音频信号优化后解码，也可以让高质量的信号直通输入得到更好的声音。
外壳采用铝合金模具拉伸成型，加厚的材料、小体积的设计（250*200*60mm）、精细的表面处理工艺（本机体积和钰龙韵SABRE系列产品搭配兼容，例如SABRE A18耳放和SABRE A10功放）。精致的纯铝音量旋扭、操作按键、避震机脚、使用起来拥有更流畅的手感。
功能特点:
● THD+N小于0.0002%，动态大于130dB，闲置噪声小于1.5uV
● USB支持32bit，384KHZ PCM信号，DSD直接解码
● Crystek CCHD-950-25-100的低相位噪声音频晶振
● 5种滤波器模式可选
● 相位可正负可调
● 消除抖动控制开关
● 滤波器，相位，抖动控制开关，可以组合调整出不同风格的声音
● 高精度DPLL锁定带宽自动设置
● 80级可调音量
● 平衡/不平衡前级输出
● 平衡前级输出带驱动器，可以作为平衡耳机放大器使用
● 纯解码模式，关闭前级，断开耳放电源
● 甲类单端耳机放大器
● 耳放输出短路保护、开机、切换操作延时保护。
● TFT液晶显示器，操作方便，5秒无操作时亮度降低80%
● 操作设置自动记忆
● 加厚铝合金机箱、纯铝按键、旋扭、避震机脚
● 100V-240V全球通用电压范围
推荐的设置：
Phase ： +
Filter mode sharp
Jitter Eliminator on 打开抖动消除器声音更凝聚
Pure DAC Amplifier off (外接功放时选此项设置)
Phase ： - 反相时适合一些早期反相录音
Filter mode Slow 高频更暗
Jitter Eliminator bypass 直通抖动消除器声音更柔软
使用建议：
* 在使用DA8II时，通电等待它充分热机之后效果更好，使用环境应注意有空气流通，甲类耳机放 大，机器表面有一定温度属正常现象！
* 使用优质的USB线缆，尽可能的避免USB接口端上的其它器材的干扰可以提高音质。
* 交流电源供电需要良好的接地，接地不良首先会在使用安全上有问题，还会导致其它电器的噪声由电源线传入DA8II，也会由地线-电脑-USB-DA8II-地线之间产生环路噪声。
* DSD模式下，50KHZ的滤波器效果更好 。
技术指标：
● USB输入格式支持: PCM 16-32bit， 44.1Khz 、48Khz、88.2Khz、96Khz、176.4Khz、192Khz、352.8Khz、384Khz、DSD64，DSD128 - On Windows DSD256，DSD512。
● USB输入操作系统支持Mac OSX Linux with UAC2 compliant kernel KS/Wasapi/WDM/ASIO Drivers for MS OS XP to Win8 32-64bit
● 同轴、光纤、AES输入：16-24Bit，44.1-192KHZ
● 信噪比： -135dB
● 动态范围： >130dB
● 失真度： 0.0002%
● 频率响应：20-30KHz-0.2dB
● 左右声道串音-135dB
● 平衡输出电平：4.2V
● 单端耳放输出功率：600欧：70mw 300欧：150mw 150R：280mw 32R：1W
● 功耗： <30W
● 尺寸： 250*200*60mm
● 净重：2.68kg
Our acoustics team did not stop exploring how to make it a better sounding device even our DA8 had received overwhelming positive feedbacks, and has worked on perfecting the sound experience for years since its first introduction. Years of efforts including circuit and component consideration, listening, benchmarking, trying out different combinations including hi-end home and studio equipment and last but not least, listening to and weighting the feedbacks from our actual users.
The result is the DA8 II, a refreshing high precision DAC which retaining the same top notched performance as its predecessor, however has pushed the sound experience to another level.
Major differences include: Low phase noise Crystek CCHD-950-25-100 audio crystal oscillator, fine-tuned power supply, Low Pass Filter (LPF) and headphone amplifier.
The sound is fuller, more powerful, and more detailed. The headphone amplifier is more transparent and dynamic. These changes bring you a brand new level of musical touch.
DA8 II includes ESS9018 as DAC chip, AD797*5 for voltage reference and low pass filter. OPA1632*2 for buffer and preamplifier output. Headphone amplifier is base on diamond buffer circuit. ON audio transistor pair output. Also DA8 II includes short circuit protection. The Canadian Plitron high quality transformer, LT1129/LT3021 and WIMA capacitor provide pure power supply for ESS9018. For analog circuit power supply, Panasonic FC、VISHAY BC046、WIMA MKS2、 NPO capacitors were selected to provide outstanding performance and natural listening experience.
USB input uses customized Combo384 chip which co-designed by Italian Amanero and Yulong. It supports DSD and PCM for formats up to 32Bit/384KHz under Mac OS X, Linux and Windows.
Different USB solutions had been tried however the original Combo384 was still preferred because of its natural and smooth sound performance.
All functions are controlled by software operating system. 2.4 inch color LED display shows the status. Dimming is enabled after 5 seconds with no operation. The unit automatic saves user settings. User friendly interface provides control for 5 different filter mode and inverse phase to produce different styles. 80 steps volume adjustment for pre amplifier output to connect to powered speakers. Under pure DAC mode direct connect to power amplifier provides even better quality sounds. It bypasses the volume control circuit and turns off the power supply to headphone amplifier to work as a pure DAC.
Multi-stage digital buffer and shaping circuit can optimize the quality of digital signal. Low phase-noise high-precision crystal oscillator as master clock, bandwidth-auto-set DPLL, switchable jitter eliminator are used to lock and optimized bad signal before decoding. Signals of high quality can be by-passed to obtain better performance.
Stretch forming aluminum case, thicken material, small size design (250*200*60mm) detailed surface processing. (Size matches Yulong SABRED series products, e.g. SABRE A18 headphone amplifier and SABRE A10 amplifier). Refined aluminum volume knob, push button and shock absorber feet give smoother fee.
Specification：
● THD+N less than 0.0002%, dynamic > 130dB, Idle noise 1.5uV
● USB supports 32bit, 384KHz PCM signal, DSD support
● Crystek CCHD-950-25-100 Low phase noise clock
● 5 different filter mode
● Invertible phase
● Jitter eliminator switch
● Filter, phase, jitter control switch. Different style of sound under different combination
● High precision bandwidth-auto-set DPLL
● 80 steps volume control
● Single/Balanced pre-amplifier output
● Balanced pre-amplifier output with driver, can be used as balanced headphone amplifier
● Work as pure DAC when headphone amplifier and pre-amplifier circuit turned off
● Class A single end headphone amplifier
● TFT LED display. Easy operate. 80% dim after 5 seconds
● Auto-save configuration
● Thickened aluminum case. Aluminum button, volume knob and feet
● 100v-240v global voltage range
Technical Specifications：
• USB Input format support: PCM 16-32bit, 44.1Khz、 48Khz、88.2Khz、96Khz、176.4Khz、192Khz、352.8Khz、384Khz、DSD64, DSD128 - On Windows DSD256, DSD512
• Operating system support Mac OSX Linux with UAC2 compliant kernel. KS/Wasapi/WDM/ASIO Drivers for MS OS XP to Win8 32-64bit 。
• Inputs: Optical、Coaxial、AES/EBU: 16-24Bit, 44.1-192KHZ。
• SNR: -135dB
• Dynamic Range: >130dB
• THD+N: 0.0002%
• Frequency Response: 20-30KHz-0.2dB
• Crosstalk -135dB
• balancedOutput level: 4.2V
• Headphone amplifier output power: 600? 70mw 300? 150mw 150? 280mw 32? 1W
• Power consumption: <30W
• size: 250*200*60mm
• weight: 2.68Kg
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