The modification of car stereo depends entirely on your own requirements, ranging from several hundred yuan to several thousand yuan, and tens of thousands of yuan. Moreover, the range of car audio is relatively large, including host, speaker, amplifier and bass, depending on how the landlord changed it. There are many specialty store audio equipment in Guangzhou. I recommend you to go to Guangzhou Daosheng for sound modification. The technology and products in the store are very professional and great.