Alpine MRD-M300 amp installed with Infinity 10" Kappa Perfect DVC wired in parallel.

The amp is indicating 0.8A current. Does this mean I have a bad ground? The amp seems not as loud as it should be. Any suggestions? It is reading 14.4V with the engine running, so I am getting power to the amp

Currenlty the ground under a bolt which holds the seat down. Could it be that I did not sand down the metal under that bolt to get a good ground?