How can you tell if your speaker is blown?

It may not make any sound, it may make a small crude sound, take the speaker and smell the open part of it. if there is any burning smell then there is a high chance that you have blown your speaker. Push on the cone. If it will not move than it is not customer servicable. If it is making extra crnching noise it is blown. If it moves VERY easily there is a small chance the coil burnt itself off of the former. Also the coil could've liquified.