Thought I'd share some of my other hobbies. Just finished this 18" home theater sub build. Uses a FI audio q18 with soft parts setup for home theater. 7cu ft tuned at 19hz. Running a crown xls 1002 as that is what I had already. First test tonight was rather impressive! Huge upgrade from the 15" that was in there before. I've built countless custom subwoofer boxes for both home and car audio, as well as many portable battery powered bluetooth boomboxes. Anyone else in here enjoy diy audio??