RME ADI2-DAC来了

发布者: luke009 | 发布时间: 2018-3-8 08:40| 查看数: 119120| 评论数: 172|帖子模式

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Loliconquesta 发表于 2018-3-12 14:21:00

本帖最后由 Loliconquesta 于 2018-3-12 14:58 编辑

看到几个群里这几天都在谈论着东西，也有人拿lyra用来对比，我们就来对比一下数字部分两者的强弱吧

1、首先是adi2-dac的数字部分：
QQ截图20180312143556.png

时钟: 内部, SPDIF输入
• 低抖动设计: < 1 ns PLL 模式, 所有输入
• 内部时钟: < 800 ps抖动, 随机扩频
• 外部时钟的抖动抑制: > 50 dB (2.4 kHz)
• 有效时钟抖动对DA转换的影响: 接近零
• 即使抖动高于100 ns, PLL也能保证无信息丢失
• 用于无故障变频ADAT运行的附加数字位时钟PLL
• 外部时钟支持的采样率: 28 kHz ~ 200 kHz
• 内部支持采样率: 44.1 kHz ~ 768 kHz

2、然后是lyra的
QQ截图20180312144027.png

关键信息：adi2-dac的：内部时钟<800ps；PLL残留抖动<1ns；2400hz时候抖动抑制50db；
lyra的：100hz抖动抑制60db

结论就不用说了，虽然lyra是个廉价无比的dpll，照样能把adi2-dac这玩意的内部PLL按在撒哈拉大沙漠的沙丘上磨上一万年
换句话说：我都要怀疑adi2-dac的官网数据是不是打错了单位了：比如把1皮秒写成了1纳秒，或者把800飞秒写成了800皮秒了
adi2-dac——这货，自身PLL底噪就1ns，说句难听的：就算给它前面多NB数字加持也一样救不了了。俩字：没救......

点评

lhnn

看来RME的强项依旧是驱动，而非音质。发表于 2018-5-25 20:55

gebegebe 发表于 2018-3-12 14:44:11

Loliconquesta 发表于 2018-3-12 14:21
看到几个群里这几天都在谈论着东西，也有人拿lyra用来对比，我们就来对比一下数字部分两者的强弱吧

1、 ...

The ADI-2 DAC is the first device in RME's range with SteadyClock FS. There is not much to improve with SteadyClock, it has earned its accolades over years of flawless operation in numerous RME devices, guaranteeing that using the internal clock will produce exactly the same sound as when using an external one. SteadyClock highly rejects jitter and handles all digital interface formats in an exemplary way. That's why SteadyClock's design and behavior didn't change in the DAC.

With SteadyClock FS the focus was put on reducing the self jitter of SteadyClock to new lows, by improving its second, analog PLL circuit, and referencing both Direct Digital Synthesis and PLL to a low phase noise quartz crystal. The self jitter measured through DA conversion now reaches levels that usually are only available in master quartz clock mode, while SteadyClock still always runs in PLL mode - no matter if internal or external clock, sound is exactly the same (again). The low phase noise oscillator driving the updated circuit reaches jitter specs lower than a picosecond (ps), an area called FemtoSecond. Hence SteadyClock FS.

luke009 发表于 2018-3-12 15:12:22