1、选择技术实力强的公司
宝马系列轿车改音响如果没有够硬的技术，很难改出好的效果来，因为汽车音响买回来，顶多只能算是个半成品，如果没有足够的技术冒然去改，很难保证最后的效果好坏。
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、选择知名的汽车音响品牌
汽车音响使用的喇叭种类很多，有同轴式、全音域、分离式及超低单元等形式。单元震膜的面积愈小则音高愈高，面积愈大则音高愈低，由于声音的频率是很长一段如果要非常好的表现出来每个频段刚需要不同的喇叭来表达，高音、中音、中低音。这样才效果更好。世界知名的汽车音响品牌有很多，仿制、劣质的品牌产品同样也有很多，这些劣质产品在播放音乐的时候，不能将音乐很完美的表现出来，而且还时不时的伴随着杂音的出现，使得音乐听起来含糊不清，所以大家如果在宝马上改装音响的时候，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、器材间的搭配问题
一套好的汽车音响器材，如果注意搭配，能够搭配出非常好的效果出来，如果不注意搭配，仅仅是将一大堆好的产品凑在一起的话，效果肯定会大打折扣，汽车音响间的器材搭配不可忽视。
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、宝马汽车音响升级选择喇叭时要根据自己的品位和经济承受能力而定。明确自己这一项支出的具体费用是多少，因为好的喇叭自然要有好的价钱。在高档豪华轿车上一般都有较专业的高级喇叭，其中以欧美产品为佳，其音质、音色比日本产品更专业。
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.

济南汽车音响升级：http://www.sdcarmusic.com/