Hello guys, I currently run a DD 9515 in a 3.8 ft" box tuned to 35 Hz with a 6.5" round pvc pipe. The port has a little flared on both ends. My amplifier is Incriminator 2.0. I have 2 AGM batteries and the big3 is done. No voltage problems. I am used to xcons, icon, and Fi btl n2. And I loved them all ! The btl n2 was my favorite : more punch than the xcon and still sounded good. I am looking at the SSA Zcon and at the Fi sp4. But I am open to suggestions. I found the DD to be brutal, it can play all the notes I want but it's "dry", not round enough. I don't know how to explain it. It is loud and can get low in this box. What would you suggest ? I would like to keep the same box. I could make another box, but with a slot port I can't go bigger than 3.4 ft3 in my opinion. Thanks for your help.