the box is tuned to 42hz but not had it on a meter yet to see how the resonant freq of the truck is effecting it. Think it is actually lower, but this is my first build in about 10 years so my ears are not what they once were
well its not a competition SQ build but it was built to sound good not be spl....but i listen to mostly dubstep and country so the higher was better. But the port is easily removable so i can play with it