Ok guys so I have an issue. I've had my 2013 EX-L V6 for about 2.5 years so far. About a few weeks ago I started having this issue with the subwoofer I installed not being as loud anymore and it doesn't get any louder after around Volume 20. My setup is a Polk Audio PA330 Amp and a Kenwood Power Series Subwoofer. I tapped into the OEM subwoofer cable right where in plugs into the sub and ran my line out converter to the amp. I'm thinking that the line out converter is bad or something the factory subwoofer cable shorted out? Are any of these possible or does anyone have any advice. BTW I turned the bass boost and gain up on the amp. The subwoofer is louder but like I said above about volume 20 it gets quieter. I also think that when I'm parked the subwoofer is louder than while im driving.