Last fall before parking my car for winter I removed the Memphis PRX 5.550 5 channel Amp and sub. Disconnected battery, took pictures, and removed them.
Got the car with this setup already installed.
This spring went to just put them back the way they were and the sub didn't work. Looked at the head unit settings and turned sub to on. Still nothing.
Fuses are good. Tried the only spare speaker I have from the garage radio, an old boom box speaker. It barely made any noise.
The sub is a JL 10" , in a JL box, I think. Running at 4 ohms