之前本站曾经做过iBasso DX300的评测。当时那个评测还犯了个错误,把LO和PO的SINAD差异误以为是Mango系统和安卓系统的差异;后来和iBasso厂家友好沟通和交流之后搞清楚了状况。同时在沟通中我了解到,DX300的AMP12测量表现要好的多,于是我向厂家申请了一片进行测量。
![%title插图%num Photo](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/Photo-7-1024x683.jpg)
![%title插图%num AMP1112A](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/AMP1112A-1024x683.jpg)
![%title插图%num AMP1112B](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/AMP1112B-1024x683.jpg)
![%title插图%num AMP11](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/AMP11-1024x683.jpg)
![%title插图%num AMP11B](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/AMP11B-1024x683.jpg)
![%title插图%num AMP12](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/AMP12-1024x683.jpg)
![%title插图%num AMP12B](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/AMP12B-1024x683.jpg)
AMP12是双4.4口,LO和PO口分开的设计,至于什么甲类不甲类我其实不感兴趣,直接开始测量:
![%title插图%num LODashboard](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/LODashboard-1024x560.jpg)
![%title插图%num PO4VDashboard](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/PO4VDashboard-1024x560.jpg)
![%title插图%num POMAXDashboard](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/POMAXDashboard-1024x560.jpg)
仪表板下的SINAD果然好了很多,最高RMS也是高了很多
![%title插图%num Dynamic-Range](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/Dynamic-Range-8-1024x256.jpg)
![%title插图%num Linearity-(-20](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/Linearity-20-7-1024x777.jpg)
![%title插图%num THD+N-Ratio-vs-Freq](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/THDN-Ratio-vs-Freq-6-1024x825.jpg)
这个THD+N扫频有个奇怪的地方,40K的THD+N在不少地方居然比20K带宽下还低……这是什么情况呢?好像是后面的SINAD的……我们做个SINAD-时间记录看看:
![%title插图%num SINADALL](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/SINADALL-1024x541.jpg)
![%title插图%num 第一次测试](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/SINAD-1-1.jpg)
![%title插图%num 第一次测试之后立马测](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/SINAD-2.jpg)
![%title插图%num 停信号之后180秒重测](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/SINAD-3.jpg)
![%title插图%num 停信号之后360秒重测](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/SINAD-4.jpg)
![%title插图%num 第四次之后立马再测试](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/SINAD-5.jpg)
视频我也录了下:
而且耳机接口最大输出的SINAD稳定性也有类似的问题:
![%title插图%num SINAD vs Time](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/SINAD-vs-Time-1024x541.jpg)
当然,在这里我必须补充一句,这种程度的SINAD变化大部分情况下是听不出来的
![%title插图%num SMPTE-Ratio](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/SMPTE-Ratio-8-1024x820.jpg)
![%title插图%num Multitone](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/Multitone-7-1024x825.jpg)
![%title插图%num 12K](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/12K-7-1024x651.jpg)
![%title插图%num USB12K](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/USB12K-1024x711.jpg)
![%title插图%num THD+N-Ratio-vs-Measured-Level](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/THDN-Ratio-vs-Measured-Level-6-1024x409.jpg)
看上去只有几个到几十mW的输出功率的时候,THD+N就开始上升了?其实问题比这个还要大,是在这么小的输出功率的时候左右声道的失真情况就开始不一致了:
![%title插图%num THD+N-Ratio-vs-Measured-Level-ALL](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/THDN-Ratio-vs-Measured-Level-ALL-1-1024x409.jpg)
总结:之前DX300的绝大部分测量成绩确实是被AMP11拖累了,AMP12的确如iBasso所说的测量结果好了很多。但是AMP12可能是由于使用了一些分立电路而在这么小的电路板上能用的元器件要做到高度的一致性确实是很难的……最终的Bug依然是不少……
![%title插图%num %title插图%num](https://cdn.l7audiolab.com/wp-content/uploads/2022/03/瓜太多.jpeg)
看来钱没到位🤓
?
瓜太多以至于不知从何处吃起…..
感觉还行?……看完甚至想买了
比AMP11情况下好太多了
现在好多DAP都可以换耳放模块啊,想当年,这还得追溯到…
801
其实如果能修修bug还算不错?尤其是看完cayin的测量后再看这个。
SINAD上升慢这件事 不算大问题(文章中也说了) 主要还是负载能力问题……
有个疑问,为什么DAP这么大体积连很多小尾巴的性能都达不到?尤其是价格也都不便宜。
多种原因吧 包括市场原因
所以简直不知道这些便携播放器和替换模块到底在折腾啥?就是图烧友开心、脑放大开?
市场经济是高度社会化和市场化的商品经济,是市场在资源配置中起决定性作用的经济。