I bought 2 Planet Audio 10"s with an 800 watt Rockford Fosgate amp pushing them from a guy I know at work, and he installed everything for me. Normally I would get it installed at a shop, but since he used to work at a shop installing systems I figured there would be no problem. Let me kind of describe it. He had to drill a hole in my firewall since there wasn't one already there to run the wire to the battery. I think that may have something to do with my first concern. Whenever my car is idling, just sitting with the engine running, I hear a kind of whining/humming noise from the direction of the engine. When I press the brak it stops, and when I press the gas it stops. Running 4 guage wire if that helps. Also, my check engine light has been on since he installed it. I don't know what this could be from, since all he did in the engine area was drill the firewall hole and attach the wire to the battery. I'm going to reset it and then if it comes back on I'll get it checked out I suppose. Last thing. Ever since he installed it my brake has been a lot lighter than normal, I guess that's the right way to put it. Sort of like I have to press the brake a lot more gingerly than I used to for it to slow down. Any help?