I bought the gmos harness at first but it didnt work, so i took it back to where i got it and they tested it and it was defected so they sold me the p.a.c. one, thats what i have....
i have the sla on +4 and the loudness all the way up, there is no adjustments on the harness for any levels. it has wire hook up not rca hook up, should i get a different harness, i dont want to have to buy new high speakers and another amp