前几天一位大佬 @李凌佳琦 在别人的介绍下找到我,问我是否愿意测量一下AudioQuest DragonFly Cobalt(AQ蓝蜻蜓)。对于送测的要求我当然不会拒绝。于是我昨天收到了这条“小以巴”:
![%title插图%num AudioQuest DragonFly Cobalt MQA Photo](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/Photo-5-1024x683.jpg)
实话说这货还是有点好看的,虽然看上去是个U盘的样子,但是随着不同的采样率会变色的Logo让我觉得挺有设计感。USB A口的设计大大提升了小以巴本身接口的可靠性。不过其实蓝色的漆面做工并不好,细腻度实在是让我觉得很失望。
好了,不说废话,开始测量。
![%title插图%num AudioQuest DragonFly Cobalt MQA Dashboard 1KHZ 0dbFS](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/Dashboard-1-1024x560.jpg)
好吧…… Emmm……
测个50HZ的仪表板……
![%title插图%num AudioQuest DragonFly Cobalt MQA Dashboard 50HZ 0dbFS](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/50HZ0dbDashboard-1024x560.jpg)
好吧,这个的确是有点一塌糊涂了,但是……包括送测的人在内,这玩意很多人听过表示没什么大问题,而这实实在在的测量结果又表示问题很大……这中间哪儿出了岔子呢? 我陷入了深思…… 并从测量中找到了可能的原因:
![%title插图%num AudioQuest DragonFly Cobalt MQA THD+N-Level-vs-Measured-Level](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/THDN-Level-vs-Measured-Level-1024x656.jpg)
首先我设定了一个耳塞的常见阻抗和灵敏度(117db/VRms 32Ω)可以看到在dbSPL到达90之前,这个小以巴的THD+N还是不高的。只有在100db之后 尤其是105db之后,这个小以巴的失真才开始迅速上升。也就是说在推一些高敏低阻的塞子或者耳机的时候,失真并不大,也应该不会导致感知的严重劣化。
![%title插图%num AudioQuest DragonFly Cobalt MQA Dashboard 1KHZ -20dbFS](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/25Dashboard-1024x560.jpg)
![%title插图%num AudioQuest DragonFly Cobalt MQA Dashboard 50HZ -25dbFS](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/50HZ-25dbDashboard-1024x560.jpg)
而且这设备的DR也属实是不差的:
![%title插图%num AudioQuest DragonFly Cobalt MQA Dynamic-Range](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/Dynamic-Range-2-1024x384.jpg)
线性度也还不错:
![%title插图%num AudioQuest DragonFly Cobalt MQA Linearity](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/Linearity-20-4-1024x779.jpg)
高频掉的早:
![%title插图%num AudioQuest DragonFly Cobalt MQA Relative-Level](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/Relative-Level-1-1-1024x665.jpg)
![%title插图%num THD+N-Ratio](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/THDN-Ratio-5-1024x818.jpg)
![%title插图%num THDN-Ratio-VS-Freq-1](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/THDN-Ratio-VS-Freq-1-1024x833.jpg)
![%title插图%num SMPTE-Ratio](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/SMPTE-Ratio-4-1024x863.jpg)
串扰是非常优秀的……
![%title插图%num %title插图%num](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/Crosstalk-4-1024x808.jpg)
数字部分 不差
![%title插图%num %title插图%num](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/12K-3-1024x709.jpg)
0db的多音当然是炸了
![%title插图%num %title插图%num](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/Multitone0-1024x820.jpg)
不过-25dbFS的多音其实是OK的 甚至有点好:
![%title插图%num %title插图%num](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/Multitone-25dbfs-1024x820.jpg)
32Ω带载大约50mw:
![%title插图%num %title插图%num](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/THDN-Ratio-vs-Measured-Level-1-1024x818.jpg)
输出阻抗是低的:
![%title插图%num %title插图%num](https://cdn.l7audiolab.com/wp-content/uploads/2020/12/OI.jpg)
这实在是太给面子了哈哈
对送测者负责 但是不做假数据
会不会是供电方面的问题,测量的时候是PC供电还是播放器手机之类的呀( ͡°ᴥ ͡° ʋ)
不会是供电问题
这价格很醉,要大推力推高阻大耳不如买拓品G5,剩下的钱还可以全家吃个海底捞