Ok this will be my 3rd go at a sonosub, but this time I'm going to take my time & make this one a piece of eye candy. So heres the deal I have a Dayton 15"DVC & PE 250watt plate amp that I will be using. I plan to use a 20" diameter sonotube & would like to tune it around 16 to 20hz. What height would I need to make it & what size port or port's would I need to use. This time I'm going to go all out to make this one something that really gets attion. I plan on laminating the sono in real Oak veneer & finishing both end caps in high gloss black lacquer. I have already started my legs for it which are nothing like I've seen anyone do yet. I just cant resist building another one. I got in a hurry with my other two just to have a sub, but this time I will be building it wile I have a working sub so I wont be in such a hurry to get it done. Anyway I have done some searching around here & got a few ideas on some things that may work but I wont to be sure what would. One that I had found somewhere around here was a 20" by 50" sono with a 6"by 20" port which tuned it around 18hz if I remember right. This may not be quite right but I'm pretty sure that was what I seen. Would this work with what I have? Thanks for any help..