The original speakers in most cars aren't very good. If you've already replaced the original radio in your car and you want to improve the sound even more, replace the factory speakers.
Select several speakers that fit your car and budget.
Ask the salesperson to plug the speakers you've chosen into a radio that's similar to the one in your car.
Play your own music when testing the speakers.
Choose the speakers that sound best to you.
Choose coaxial speakers for the front doors. (A coaxial speaker is actually an assembly of two speakers. One plays the mid-range/mid-bass frequencies, and one plays the highs.)
Check the speaker package before you leave the store. Make sure you're getting everything you bought: speakers, screws, grille, speaker wire, owner's manual, installation instructions and warranty.
Remove the existing speakers.
Measure the speaker openings. Front speakers usually measure 4 inches, 5 inches or 6 inches. Speakers in the rear deck are usually 6 by 9 inches, 6 1/2 inches or 5 1/4 inches.
Choose a favorite CD or tape to bring with you.
