Guy's, Got a refurb Rockford Fosgate X5 type db series amp. only had about a month. It is hooked up to a RF punch with 400watt capacity. Also have a low level input due to the stock HU.

Everything was fine and dandy, shut the truck off. Came back about an hour later and all I got was a light fuzz from the speaker.

I replaced the line input with a new one (thought this was the weak link), but still fuzz. The speaker also checked out good (tried it out inside the house).

The amp is getting power, but no sound. Took it apart and nothing "looked" fried, nor did anything smell funky. Do you all have any ideas or things that I could check with a volt meter? Please help a brother out!