喇叭失真量？

http://en.wikipedia.org/wiki/Loudspeaker_measurement#Distortion_measurement

Most speakers give around 3% distortion measured 468-weighted 'distortion residue' reducing slightly at low levels.

相較於擴大機0.1%以下這數字，3%當然算高。

Electrostatic speakers can have lower harmonic distortion, but suffer higher intermodulation distortion. 3% distortion residue corresponds to 1 or 2% Total harmonic distortion.

 這有趣，不知其中的機制是啥...

Professional monitors may maintain modest distortion up to around 110 dB SPL at 1 m, but almost all domestic speaker systems distort badly above 100 dB SPL.

嘿嘿...這就是HiFi喇叭廠從不說的事...