车子在行驶的时候，难免会有噪音，噪音的来源是很多的，种类同样有很多，特别是发动机的噪音，大家可以通过做汽车音响改装来给车子降低噪音，享受更好的汽车音乐。汽车噪音从种类上区分主要分以下三种：
一、高频噪音，主要包括发动机咆哮声、砂石敲击底盘声音、车体部件结构不紧产生的震动声。高频声音的特点就是清脆、响亮、易察觉，可以做发动机、引擎盖、U型槽隔音，如果风燥很大，还会考虑做底板隔音等，做汽车隔音，主要还是根据车子具体的部位来做。
High-frequency noise, including engine roar, gravel percussion sounds chassis, body parts structure does not bear the sound vibrations produced. High frequency sound is characterized by crisp,loud, and easy to detect, you can do an engine, hood, U-slot insulation, if the wind dry large, soundproof floor will consider doing so do car noise, mainly based on the specific parts of the car to do.　
二、低频声音，这个主要包括路噪、胎噪、颠簸时减震的声音、怠速时排气管的气浪冲击。低频声音的特点是沉闷、不清晰，有时候，我们被低频噪音搞得头痛，还找不到原因。
Low-frequency sounds, this includes road noise, tire noise, bumps shock when the sound of the exhaust pipe at idle blast impact. Is characterized by low frequency sounds boring, is not clear,sometimes we do a headache is the low-frequency noise, also can not find the cause.
三、混合噪音，主要是来自车外的环境噪音。
噪音的传导媒介其实很简单，噪音的传导就靠传导媒介，汽车噪音的传导媒介就两种：一是金属车体；二是空气。
Conducting media noise is actually very simple, noise conduction rely on conduction medium, vehicle noise conduction media on two: First, the metal body; two air.
　　

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