What is the speaker frequency response?

Frequency response frequency response for short, is the car speakers can replay audio signal of minimum valid playback frequency and maximum effective range of playback frequency (in Hz) and a frequency range of non-uniformity (in db). There's no uniformity is a constant voltage output of audio signals and systems, in-car speakers-generated sound pressure with the frequency of change that occurs enlarges or attenuation, phase and frequency changes. The frequency response can measure on-board speakers on high, medium, and low representation of the frequency band signal uniform. For in-car speaker frequency response of the request has two parts: one is a wide range of possible, i.e. to be able to play the lower limit of the frequency is low, as far as possible, high-ceiling; the second is the points in the frequency range of response to smooth, avoid excessive fluctuations.