I have a (kinda) old Alpine V-Power amp. I never really had any friends with systems, so I had nothing to compare to, but when I start the car, even when I turned it off with the volume up, I get no bass. It seems like I have to turn it either up, or turn it down then up a little higher. It's almost like it needs a certain signal to kick on. I don't have to turn it up to ear-drum destroying levels to get it to kick on, it's just kinda weird. Anyone else noticed anything like this?