[音响] 终于完成合体了，这次充值了不少信仰啊。

耳塞用耳放喷了，那是一耳朵的失真
https://nwavguy.blogspot.com/201 ... phone-ampsdacs.html
Output impedance is one of the more common audible differences between anything with a headphone jack. As a simple rule of thumb, if the headphones are less than eight times the output impedance, the amp can alter the sound. So if you have the FiiO E9 amp, which has an output impedance of 10 ohms, you can only use headphones that are at least 80 ohms, otherwise the amp might change the sound. Breaking the “eight times rule” can result in muddy bass and even audible frequency response changes—especially with balanced armature in ear monitors such as Shures, Etymotics, Ultimate Ears, etc.