i currently have a Fi Q 15 in my trunk.. well i managed to snag an obsidian 15 for basically no cost at all that has never been used. (Long story). Now i know the Fi Q is more expensive and probably the better sub but the box the Fi Q is in would work better with an obsidian 15. Basically the obsidian 15 box req's are closer to the box i have than the Fi Q box req's. So do you guys think the obsidian would sound better than the Fi Q because of that? Or should i just go ahead and sell the OA 15? Any input is greatly appreciated.