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Is there any sound via the headphones? If it is normal but not on the speakers you have a faulty headphone socket.
If you turn it up to full volume can you hear anything? If you can then the main amp has failed.
If the speakers are making a crackling noise at high volume yes, you need to take them in for service. The main problem that I have found to cause this issue is faulty instillation from the factory or using the system at a high volume with music. If it were me, I would send them in to Bose. They are a great company and will work with you to fix the issue.
OK, this is just a suggestion, without analysing the unit myself.
From my experience with these type of units, it is usually overheating of the IC's on the circuit board. You can do another test just to double check. Turn the unit off, unplug it from the wall supply for about 10 minutes. Then plug the unit back in and turn it on. Now turn the volume very high, without the speakers starting to distorted, where you can still hear a clear sound.
Now, if this is an IC overheating, the sound should start distorting and cutting out. This is actually a very common occurrence with these types of players as well as receivers in general.
Try the above, let me know what happens.
Also, please do not hesitate to let me know if you need any further assistance.
It sounds like maybe you have speaker wires touching somewhere. If they are touching it will blow fuses, especially if you turn the volume up to try to hear anything. DO NOT put bigger fuses in to replace the old ones, you will actually do more damage to your system because a higher volt fuse will allow a higher voltage to "spike" in your stereo and might just start frying internal parts.
Sounds like an amplifer fault. Many of these Midi system use a large black IC attached to a metal heatsink. They control both the power amp and pre amp on both channels. When they go wrong they can cause all sorts of effects,
If you can repair things I would look at that. If not get ready for a large bill. If it's the IC some are expensive, it does most of the work!
Sounds like an internal loose connection somewhere, possibly anywhere, a connector on a pcb, a dry solder, loose pin on an IC. Tough for an end user to solve this, would entail opening the unit and investigating. I checked the rear panel in the op manual and this model has no ribbon connectors else i'd have asked you to check them.
It sounds to me like you both are having a problem with a capacitor going bad. some capacitors act as a noise filter and it sounds like you both have a bad one. If you are any good with a volt-ohm meter that reads capacitors you should check them to make sure they are at their proper values which will be posted on the capacitor. then replace it. if you dont know how to use a v-o meter then take it to a shop and have them replace it
Of course it will stop buzzing when you mute the speakers.
From the limited description, it could be anything from a power supply to loose wires in the system between the speaker leads and the motherboard.
Best bet is to take it in to a technician and get a pro's answer. If he wants to charge more than what it's worth to you, get a new one.