比较深入玩过LP唱机的人都知道,摆放唱盘的平台必须要非常稳固,否则外界的震动会引发机震,虽然非常轻微,但通过灵敏度极高的唱头拾取、再经过高增益放大,就会在音箱中产生轰隆隆的杂音。另外有时在音量较小的情况下听不到任何杂音,而音量一旦加大则杂音就出现,并随着音量的增加也迅速增长,原因就在于:大音量时低音扬声器振膜推动空气的振动强度也较大,正是这种空气振动引起了机震,从而产生杂音。通常把这种现象称为“声反馈”。 Players have played more deeply LP player knows that the turntable platform must be very stable, or the external vibration will trigger machine shock, although very slight, but through the pickup of high sensitivity, and then through high gain amplification, It will produce rumbling noise in the speaker. In addition sometimes in the case of small volume can not hear any noise, and once the volume increases, the noise appears, and increases with the volume also grows rapidly, because: large volume bass speaker diaphragm to promote air vibration Strength is also large, it is this air vibration caused by the machine shock, resulting in noise. This phenomenon is often called “acoustic feedback.”