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Panasonic SC PT860 Manuals
The above link is the owner's manual - it may help.
Here are some other ideas:
Try to find out if the crackling sound is coming from all speakers or just one - you may just have one bad speaker.
If the crackling happens at high volume settings, you may be overdriving the system - you'll just have to turn it down!
Try turning down the bass or the subwoofer level.
Is the crackling present with all sources (TV, cable, DVD, bluetooth)?
You can't get an original part unless you find a system on eBay or somewhere similar and take the part from it. Computer companies buy these speaker systems from other manufacturers, and treat them as just one big part. Under warranty they simply replace the entire unit. No components are offered (other than the wall-wart AC adapters when used). I went through this with Compaq/HP and Dell when I worked in service for a big retailer. Most people just buy a new system when theirs goes bad out of warranty.
Now, if you're like me (and I know you are since you're asking), you don't like to throw anything away if it can be fixed. Since this is the subwoofer, it's probably going to be on the floor or otherwise out of sight. So another possible repair is to get a replacement control with the same value as the original, solder some leads onto it, tack them to the pcb pads of the original, and just let the replacement hang out the hole where the original came through. Or you can be a little more ambitious and mount the new control properly, then wire it to the pcb.
Good luck in the repair, and thanks for using Fixya!
I have a YST-MS30 myself. Judging by Yamaha's site, the MS50 looks like it's built pretty much the same way. The subwoofer by itself is pretty useless. The power switch and volume controls are built into the right satellite speaker. There is a level control for the subwoofer, but overall system volume is controlled by the satellite speaker. You also need the power supply (15 volts, 1.2 amps for the MS30, but probably different ratings for the MS50 with its higher power).
Actually, it would be possible to open the subwoofer and puzzle out which pins in the connector you would need to jumper together to turn it on, and you might be able to find a suitable power supply. But it seems like more trouble than it's worth. Complete new system with comparable specs are around $100 from online vendors.
After I posted my problem, I browsed a bit further through the other posts and solutions, until I came across the solution of TrickyTrev34 and gave it a try. However, I did not slice the cable, but did it as follows:
1. Switch off power of the sound system on the subwoofer box. Disconnect the Front Right (FR) speaker box (the one with the volume control) from the subwoofer box. 2. Remove the silver coloured metal oval on which the speaker box stands. Now you'll see a small screw at the bottom of the speaker box. remove it.
3. Carefully remove the silver coloured metal protection plate (with all the little holes) from the front of the FR speaker box by wedging it from the top with a flathead screwdriver or other thin blunt object. Now you'll see the speaker and 4 holes with screws inside. Remove screws and speaker box opens up.
4. Inside you should see six wires (Red, Blue, Yellow, White, Green & Black). Carefully cut the GREEN wire only. Insulate the both ends of the GREEN wire with electrical tape or heatshrink or similar. 5. Put the FR speaker box back together in reversed order.
6. Connect FR speaker back to the subwoofer box. Make sure the volume setting on your PC is very low, because when you switch back on the power of the subwoofer, you should be blasting again.
As TrickyTrev34 already mentioned, the only downside of this procedure is that it will disable the volume control on the FR speaker, but who cares, your sound system works again, and you can still control the volume via the PC playback control panel and/or the multi-media keyboard if you have one.
shut off audio system is performed to protect it from damage due to high current consumption or short circuit in speakers try to disconnect subwoofer first and check if it is ok. the problem in your subwoofer or its cord-change the cord and check if it is ok thats fine if not change subwoofer.do the previuos for all speaker one by one. if all above failed you must contact service center for help.
If the sub has a volume control, turn it down then turn up the volume on the amp to the very high volume you mentioned. If it still has very low muffled sound, then we know the problem is about the amp.