Hi, awaiting delivery of my IXL18s for my LLT sonosubs. I am using a single 3 meter length of sonotube cut in half giving 386litres when using 3 105mm ports tuned to 14Hz. I would appretiate any feedback regarding this modelling, especially tuning frequency and port diameters([email protected]). EP2500 with a BFD1124p will be used with these two subs. :bigsmile: