speaker wire on '02 sequoia

[oraclesage]

After hitting a bit pot hole which blew one of the front tires, the radio went completely silent. On the LCD, it turns on, changes station, and everything looks normal, but I don't hear any sound.
I removed the radio and checked the cable connections in the back, but they look fine. Even before the pot hole, I used to have some crackling noise from front speakers on a rough road, so I suspected a problematic speaker connection. From the fact that none of the speakers work now, is there any particular connection that I should look into? Thanks. - Phil