No sound coming from radio?

[Ve uterus]

Hmmm, all of a sudden there is no sound coming from my radio?
It has an after market amp under the seat and a sub behind the seat ( it’s a Ute) would anyone have any ideas as to what might be wrong? Maybe amp is dead? The head unit has power and everything seems to work on it as it should just no sound

 

[corhijasna]

Sounds like The amp however check applicable fuses first