I have a 2008 ford focus SES coupe with a factory sub which appears to have a small amp attached to it, nothing fancy. I have noticed that in the cabin, the stock door and rear speakers are crackling and before they blow out, I am looking at replacing them. Will the sound quality decrease or increase with bass as well? I have been looking at pioneer speakers but will the stock deck prevent the speakers full sound potential? As you know, the 2008 ford focus' radio systems are hard to customize by myself. But replacing the stock speakers, will it decrease the sound quality with the original stock deck? The bass with the factory sub is amazing at peak, and I'm afraid it will change. Thank you for your time.