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Crackling Sound From Subwoofer
Check any wiring coming or going to the subwoofer. It sounds like it could be a loose connection. Is there a LFE or bass boost knob on your subwoofer? Does turning that up/down cause the crackling (if it exists). If so, you could use some tuner cleaner to clean the contacts on the potentiometer knob.
If the crackling is on the subwoofer only, it might be damaged from bottoming out. See if you can remove the baffle or grille covering the woofer and inspect for visual problems. You can also try to lighly push in and out on the subwoofer to hear if it makes any scraping sounds. If so, it is definitely damaged and the driver will have to be replaced.
Humming/buzzing from 221's Subwoofer.
You should replace the large Electrolytic(s) in the power supply. You should replace any other Electrolytic capacitor that the top is bulging or looks like there is something coming out of it.
Personally I would not recommend replacing any polarised capacitors with none polarised, unless you have seen an instruction from the Maker of the unit, which tells you to do so.
I recommend taking a look at the Bad Caps Forum for more information about Electrolytic Capacitors.
How to open the case of the speakers?
since u hav removed the mesh and the 4 screws that hold the case of the speaker .As you said that the speaker has no opening points , most companies manufacture the speaker by sandwiching two parts together. In order to open the case of the speaker , you will have to see for a joint line on the edges . it indicates the attachment between the two parts of the speaker . If you find an opening at the back of the speaker as you have mentioned , try to remove the two joints of the speaker by pulling gently at the opposite ends .
The computer doesnt register any
I assume that these speakers connect to the line out jack of a computer (same plug as headphones)? If so, can you plug them into a mp3 player or some other audio source you normally use to make sure the problem is not in the speakers.
Also, could you update your question with your audio card and drivers?
Busted vocal speakers
if your computer came with a motherboard disc the sound drivers could be on it
click start control panel administrive tools computer management device manager scroll to sound,video and game controllers you might see a yellow question mark? Right click to reinstall drivers or uninstall
click start control panel sounds and audio,volume,advanced,speakers make sure you have selected the
(((appropriate speakers))) also audio you will find 3 drop down lists make sure you have the correct settings there
click start control panel sounds and audio devices select advanced there might be a tick in the mute box untick it
click start control panel sounds and audio devices you can adjust the volume there also select speaker volume you can change your settings there you can also tick in the box place icon in taskbar
if his does not fix the problem
click start control panel sounds and audio,volume,advanced,speakers select the appropriate speakers from the drop down list or navigate to the device manager scroll to system devices + to expand,system speaker right click properties then select use this device (enable) also you might check
the speakers plug/outlet is usually at the back of the computer you will have to open up the computer to check the lead attached to the rear of the input plug make sure the connection is good
try cleaning your computer of dust using a fine air blower from a compressor making VERY sure that there is no MOISTURE in the air line specifically around the sound card and the CPU central processing unit dust causes static to build up in a computer
hope this helps
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