The speakers sound like they are blown - Altec Lansing Inmotion Im600 Speakers

yes buy a sound bar to replace

Unfortunately, it sounds like the speakers are blown out. All you can do is replace the whole speaker.
How to Tell If Your Car Speakers Are Blown

can mean several things. The crackle is subjective and can mean distortion. Distortion most of the time comes out of the amplifier. Could be you have blown a capacitor in the power supply of the amplifier, making it work with quasi half the voltage. There is no need to change the polarity on a speaker, because when one is not working infuse, it won't distort the music. You only could have difficulty with the stereo sound. It could be a bit unclear where the sound is coming from and could sound a little less powerful.Check the speakers on a different amplifier, to hear if I'm right. Only if you switched on sound while the amp was giving full power, you could have blown the speakers, but most of the time they don't give any noise after that.

Blown speakers! Need to attache to bad speaker and see if you hear sound to verify blown speakers.

If the amplifier itself is making the popping sound I suggest you disconnect it immediately, as it could be an electrical short within the amp. If the popping sound is actually coming from the speakers, it could be due to a crossed wire, blown amp channel, or blown speaker. If you posses the technical know-how, you can test the amp channel and speaker by connecting a different speaker to the channel responsible for the popping sound. If the new speaker makes the same popping noise then it is most likely a blown channel. I hope this helps =)

it sounds as if you may have a blown output ic.

Technically, the television should protect itself from doing any damage, but sometimes that doesn't happen correctly.
When you say that they sound like the speakers are blown, can you describe that sound?
If it sounds like they're blown, they likely are.  It's probably about the same cost to repair the speakers (if out of warranty), than to buy an external amp and speakers.

your speakers will still make sound if blown, it just wont be good sound, are you sure you have all the cables connected correctly?

just gently push on the sub if it makes a noise like a grindin sound its blown.if it dont glue the center back on

Any speaker, if abused, can be blown. And if overdriven with dirty power at extreme levels it is not uncommon to burn out the voice coil. You might also want to check out the speaker surrounds. If they go, the speaker works but sounds lousy.

Localize the problem by hooking up two known good working speakers and see what happens. If they also do not work properly or sound like cr-p then the radio is at issue.