I just installed my jl 250/1 with my 12w3 to my stock bose HU. I didn't use an LOC because my amp can take the frequency from the speakers. I tapped into the wires for the rear armrest speakers before the bose amp. what I've noticed is that when I first turn on the radio it take about 10 seconds for the sub to kick in, or when i turn the volume down below 10 while just sitting in the car, the amp turns off. I placed my ground to one of the bolts between the bose amp bracket and the bare floor of the trunk. Help me out here.