My Xv2 12 is tuned to 29hz. Tuning to 28 when I get my Zv5 18s //content.invisioncic.com/y282845/emoticons/yumyum.gif.0556df42231b304b9c995aefd13928a8.gif lowz4lyfe3 cubes, 30-35” of port tuned to 28hz //content.invisioncic.com/y282845/emoticons/yumyum.gif.0556df42231b304b9c995aefd13928a8.gif