Have a few questions about gaining dbs. I like running a single sub due to box size requirements for my car. I know adding another woofer would be one of the best ways to gain on the meter but so does going to the next size woofer in most cases. What about adding sound deadener though? How much have you guys gained by just adding deadener? Which be a bigger gain going to a 15" or adding the deadener. Common answer is both but only able to do one at a time right now.