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1、選擇技術實力強的公司
寶馬系列轎車改音響如果沒有夠硬的技術，很難改出好的效果來，因為汽車音響買回來，頂多只能算是個半成品，如果沒有足夠的技術冒然去改，很難保證最后的效果好壞。
BMW series cars hard enough to change the sound if there is no technology that is difficult to change a good effect, because the car stereo to buy back, at most, can only be regarded as a semi-finished products, if there is not enough technical temerity to change, it is difficult to ensure that the final good and bad effects.
　　
2、選擇知名的汽車音響品牌
汽車音響使用的喇叭種類很多，有同軸式、全音域、分離式及超低單元等形式。單元震膜的面積愈小則音高愈高，面積愈大則音高愈低，由于聲音的頻率是很長一段如果要非常好的表現出來每個頻段剛需要不同的喇叭來表達，高音、中音、中低音。這樣才效果更好。世界知名的汽車音響品牌有很多，仿制、劣質的品牌產品同樣也有很多，這些劣質產品在播放音樂的時候，不能將音樂很完美的表現出來，而且還時不時的伴隨著雜音的出現，使得音樂聽起來含糊不清，所以大家如果在寶馬上改裝音響的時候，一定要辨清器材。
Many types of car stereo speakers to use, there are forms of coaxial, full-range, separate and ultra unit and so on. Unit area of ??the smaller diaphragm higher the pitch, the greater the area the lower the pitch, due to the frequency of the sound is very long if you want a very good performance out of each band just needs to express a different speaker, treble, tenor, bass. So that it better. The world's leading car audio brands have a lot of imitation, inferior brand products also have a lot of these inferior products in playing music, not music perfectly manifested, but also occasionally accompanied by the murmur of appearance, making music listening it vague, so if we converted audio on a BMW, they must discern equipment.　

3、器材間的搭配問題
一套好的汽車音響器材，如果注意搭配，能夠搭配出非常好的效果出來，如果不注意搭配，僅僅是將一大堆好的產品湊在一起的話，效果肯定會大打折扣，汽車音響間的器材搭配不可忽視。
A good car audio equipment, if attention with, can come out with a very good effect, if not pay attention to match, just a lot of good product will get together, the result will be lowered, car audio between equipment with can not be ignored.
　　
4、寶馬汽車音響升級選擇喇叭時要根據自己的品位和經濟承受能力而定。明確自己這一項支出的具體費用是多少，因為好的喇叭自然要有好的價錢。在高檔豪華轎車上一般都有較專業的高級喇叭，其中以歐美產品為佳，其音質、音色比日本產品更專業。
BMW car audio speaker upgrade choose according to their taste and affordability may be. This is a clear understanding of their specific expenditure is the cost, because a good speaker naturally have a good price. On the high-end luxury cars generally have a more senior professional speaker, in which European and American products better, the sound quality, sound more professional than Japanese products.

濟南汽車音響升級：http://www.szanyuda.com/