There are certain accessories that you should get hold of before starting the installation process of the car audio in dash unit. Important among them is a wiring harness which is required to connect the wiring of the system bought to the existing wiring in the car. A harness doesn't cost much either.
Since you are buying an in dash unit that fits your car, you will be given an installation kit which will contain all the hardware necessary for the installation. This will help to ensure that there are no gaps between the system and the dash board. You will find a connector with reasonable length to achieve this. CB antennas or Power antennas may be required. The final testing is done with test disks to optimize the sound,
The in dash audio system can be operated by remote control. A set of 4 speakers will enhance sound quality i.e. two in front and two at the back. Tweeters can also be used for superior sound quality. Still not satisfied with the sound means you'll have to install amps.
There are so many different types of in dash units sold by so many different companies. Check out double din CD, MP3, WMA and AAC players with front panel Aux output. Some units come with a front panel USB. Kenwood brings out the system with 11 digit, digital LCD display.