Last month while i was driving, the sound suddenly got cut off. I went home take a look around the car and found the fuse was blown. Replace it and the radio came back on for about 30mins or so and the fuse got blown again. I did some research and was told that the amp has a short. I ordered another amplifier and just received it today. Put the new one in and turned the radio on. The fuse was blown again after 1min. I bought a used amplifier from TLS. Other then that, the navi sound is on and is fine. I just cant listen to CDs or the radio. Also i cant adjust the volume or ASL or balance for the speakers. Can anyone help me determine if I have a defected amplifier or something else wrong with my unit, etc. And I have a 2004 es330 if that's any help.

Edit: After playing around with the amplifier and fuse box. I tried putting a fuse in without the amp connected and it blew right away. Now Im really confuse. Im not an expert or anything so any help would be appreciated.