Originally Posted by
Reffc
Sounds like an output stage has failed (transistors or perhaps capacitors or both). Needless to say, don't attempt to use it until it's checked out! Caps and transistors can easily be checked if you have a multimeter that has measurement function for them; that or have the unit serviced if you like what it does and intend to keep it (ie the cost of servicing may outweigh it's value but will be cheaper probably than sourcing an equivalent quality new replacement). When you say it's blown a speaker, is it a tweeter that's fried, a woofer or what? If you can ping details of the drive units affected up, it should be possible to point you in the direction of a suitable replacement.