Measurements of Topping L70 HeadphoneAmp

话说前几天住院去了,导致更新速度下降……家里堆着一大堆待测设备……本想着昨天偷偷溜回家(今天才办了出院手续)先把Topping E/L70给测了……结果实在是低估了工作量……加上我得到的医嘱是不能久坐使得工作效率下降了不少。因此到现在才搞完。那么,就让我们来先来看看 Topping L70 这台耳放:

PhotoL70
PhotoL70
Rear
Rear
Photo2
Photo2
Photo3
Photo3
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%title插图%num

这次EL70采用了新(也不新)的设计语言,白色的屏幕部分颇有点清新的感觉。L70其实说白了就是A90的电路加上继电器音量……看测量吧:

UNBALinUNBALOutDashboard
UNBALinUNBALOutDashboard
UNBALinBALOutDashboard
UNBALinBALOutDashboard
BALinUNBALOutDashboard
BALinUNBALOutDashboard
BALinBALOutDashboard
BALinBALOutDashboard
Dynamic-Range
Dynamic-Range
Linearity-(2
Linearity-(2
THD+N-Ratio-vs-Freq
THD+N-Ratio-vs-Freq
SMPTE-Ratio
SMPTE-Ratio
Multitone(555)
Multitone(555)
Multitone(E70)
Multitone(E70)
Crosstalk
Crosstalk
UNBAL-THD+N-Ratio-vs-Measured-Level
UNBAL-THD+N-Ratio-vs-Measured-Level
BAL-THD+N-Ratio-vs-Measured-Level
BAL-THD+N-Ratio-vs-Measured-Level

2022/10/27更正:之前的由于负载触点氧化原因,在高电流下接触不良导致测量结果劣化。本来16Ω的测量曲线出现一些异样的突起我就应该有所警醒,但此次测量较为着急,我个人身体状况又尚未完全恢复……精力有点不够。今天打磨了负载触点的氧化层之后重测:

BAL-THD+N-Ratio-vs-Measured-Level-2
BAL-THD+N-Ratio-vs-Measured-Level-2

为表歉意,我特将各负载曲线详细标注给大家:

BAL-THD+N-Ratio-vs-Measured-Level-Mark
BAL-THD+N-Ratio-vs-Measured-Level-Mark

音量:

Volume
Volume

总结:没啥意思……不就是加了继电器音量的A90么? 也就是便宜罢了

补充:这台L70属于三周年活动奖品之一 老规矩 评论区抽了

《Measurements of Topping L70 HeadphoneAmp》有171条评论

  1. 我有一台L30,是當日產品回收後換回來的修正版。試過用示波器看方波反應,波形很奇怪。不是一般的oscillation,而是在rising edge 和falling edge 都有明顯的抖動(可惜沒有存檔)。不知狼教授有沒有時間都看一下方波波形?

  2. Is the balanced -> unbalanced measurement correct? That is, inputting 4Vrms balanced results in 2Vrms at the unbalanced outputs? The same with the balanced -> balanced measurement: inputting 4Vrms balanced results in 4Vrms at the balanced output?

    Looking at your A90 review, 4Vrms at the balanced input results in 4Vrms at the unbalanced output and 8Vrms at the balanced output.

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