DO NOT TUNE THAT LOW! U loose ALOT of sq and response,tune it 38-42hz.The lowest I would tune a 9515 is 35hz but in a 6cuft box for each.Follow DD instrustions for box volume and tuning.yeah kicker is off the list but i dont know how to take it off there... anyway 2 9515's with a 20.1 on each one would sound good? 9-10 cubes tuned to 38-40 for comps and pluged to 30-32hz for daily?