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濟南汽車音響http://www.szanyuda.com/前級訊號控制就是在后級之前，我們一般將功放稱為后級，所以在音源與功放之間，所有對于音樂訊號的處理機件，都稱為前級。例如濟南汽車音響主機上對于音量大小的控制，就是屬于前級的部分，它控制的就是訊號的強弱度。
Jinan car stereo preamp signal control is, before the stage, we will generally be called post-stage amplifier, so between the sound source and amplifier, all the music signal processing parts are called before the class. Jinan such as car audio console for controlling the volume, that is part of belonging to the former level, the strength of which is controlled by signals.

其它音響器材中，較常看到的濟南汽車音響前級控制部分，還有高音與低音的調整、左右平衡、前后音量調整、以及Loudless響度控制。此外比較復雜的還有音頻均衡器(EQ)，其功能和床頭音響經常見到的、具有多段頻率調整音色、還會顯示不同圖案屏幕的功能相同。
Other audio equipment, more often seen in Jinan car stereo preamp control section, as well as treble and bass adjustment, left and right balance, front and rear volume adjustment, and Loudless loudness control. In addition there are more complex audio equalizer (EQ), its functions and bedside sound often seen with multi-frequency tone adjustment, but also show the same pattern of the screen different functions.

濟南汽車音響http://www.szanyuda.com/數字音效處理器DSP也是許多主機的標準配備，簡單說來就是模擬體育館、舞廳或是音樂廳等空間的聲音特性。總而言之，凡是有關于訊號的處理或調整的機構，就是前級。
Jinan Car Audio digital sound processor (DSP) also come standard with many hosts, simply that simulate gymnasium, ballroom, concert halls and other spaces or sound characteristics. In short, where there are about treatment or adjust the signals of the body, it is the former level.