in my 93 es the same thing happened.....what i did was get another power source and connect it to the power in the back of my radio....apparently the fuse(that i can't find) that blew is the same fuse for the amp too.....so either try to find the correct fuse or jump a wire from the fuse box to the radio
hmmm mine looked ok when i checked, but i moved them around and it replicated the noise, so i changed them and the sound was gone....change them anyway its only $26 form lexus....