dont even bother with those subs, max you will be able to hit is around 178.6 DB's
your best bet is to go with funky pupz, you can get mad DB'z from those, in the mid 200 range, excellent bang for your buck, you could sell one of the icons, and get 3 pupz, but have fun trying to find them..
There is no way to say actual output without testing. Too many factors at play that cause the numbers to rise or fall. If it is not for competition and it is going to be in a sealed design, don't worry about the db number. A pair of 15" Icons with some clean power will get way loud for daily (if installed correctly).
- Somewhere within the audible range of sound is your answer. Don't ask questions with infinite variables that are yet to be determined. Deleted on sight.
Or, there's the quote I used to have in my sig...
All through high school they told you there's no such thing as a stupid question. They lied.