Oops. I mean SVS clone, I got carried away. First of all, a big thanks to Mr. Tom V of SVS, what a great guy! Also, thanks to Dustin B (e-mail/website), Patrick and Andrew Lo for their helpful websites. The nitty gritty: 16” sonotube 40” high (approx 44" overall). 1” MDF plugs laminated to ¾ Baltic Birch end caps. 2-1/8" stand-offs and ¾ BB base plate. Effective volume=5.01 cu-ft, 4" full-length precision port from PE giving me an 18.3Hz tune. It’s within a couple of liters, I believe. Sounds awesome! Here are some pics and freq sweep vs. my old 10” sub. sonosub solo freq sweep, lower volume level Vs. 10" sub Da guts Top view 1 Top view 2 Full view It's not covered yet, only painted. I have the ribbing just trying to think of good way to attach it to the sub. It is the 20" ribbing, so it it not as tight as I would like it, just snug.