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Crackling sounds are from poor connections. As the system warms up, the heat causes expansion and the crackling stops. You should remove and reseat the board in its slot, remove and reseat all connections between the board and the speakers, mics, etc. and restart. The sounds should have stopped - or been reduced considerably.
The crackling sound on the left port of the bass box, indicates vibrating foreign matters inside it. Just open the box and clear it up. Put the sounds on. Listen if the crackling sound is audible. If the result is ok, then, close the box, and everything is alright.. However, if the result is otherwise, then, it is due to a defective speaker that needs to be replaced.
It could be the board or the speakers itself.
Check see if ur air tv have any crackles?
If not u can rule it out the speakers.
Tries it with diffrent cables,see what happen.
The prob.still there it ur electronic board.
If the sound FLUCTUATES up & down, try turning off the AutoVolume in the sound menu.
You didn't say if it's one or all speakers crackling.
Crackling is either a speaker or circuitry issue. Adjust the balance away from the speaker that crackles, if it stops, that speaker is probably "fried". If it still crackles, I'd turn off the speakers and run the sound thru a stereo for the quick, cheap fix.
My Samsung (10+ years old to be fair) crackles due to a circuit issue but if I SMACK the left side speaker (behind which is the sound board and side panel connectors) it stops for a while. Maddening. I think I broke it squeezing it into the furniture it's in, pressing on the protruding RCA plugs. Dumb design.
If ayou have a system with speakers that works and a different set is crackling
the set that crackles is to be determined the bad set. Cones dry up a bad assembley just coinsidents having a bad set of speakers. It is an AUDIO problem not a computer problem
Let me know what the Type Numeric Number and Model Number on the bottom of the laptop is. I can look on IBM website and see where the hard drive is in located to the speaker. It has happen on some HP and Toshiba I know from experience where the hard drive causes the speakers to crackle. Not sure why, maybe not enough shielding. The type has 4 Numeric Characters and the Model has 3 Alpha/Numeric Characters.