We are installing a Kenwood deck + Kenwood amp + 12" JL sub. Speakers are still stock. Everything is hooked up & works great. The only issue is feedback from the sub. It's subtle when the car's off, but much louder when its started up. Took it to our local audio shop & they suspected something...
We put in a new deck in our 2008 Honda Civic. When the deck is turned on - only the amp and sub work, the rest of the speakers don't. How do we fix that?