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I have two in my shop right now. The power supply is to blame with these two. the manuf. has used some type of epoxy to hold down components before wave solder. This is in the high volt side of the switch mode power section right on top of the bias components . This epoxy breaks down and becomes resistive to the components below causing a direct short. There was a company years ago that had this problem with the same epoxy. A real stupid move then and a real stupid move now. If your power board is burned due to this problem your unit may not be able to be serviced. Solution is to change the supply. Of course the supply is 3/4 the cost of a new sub. Another real stupid move. This opinion was provide by THE GREAT OZ.
ho i got a AS that did that im NOT saying it will work with yours but if you open it up and replace the fuses with new ones it should work i reakon you have blown the sound fuses and not the power fuse hope it helps m8 and like i said it might NOT work
Others have had similar problems with the amp on this model. There is probably a circuit design error which causes some components to blow and as far as I've read, fixing it (or replacing the fuse) won't make the problem go away for long. Try contacting PSB or the retailer.