[header] How to tell if your car speakers are blown [title] Turn on the vehicle. [step] Most vehicles need to be turned on for the audio system to play. Unless your car is particular, you won't need to fully start the engine, which would only waste gas. 
[title] Insert a cd or mp3 device with a full sound range. [step] Pick something that you play often in your car, so you know what to listen for.