depends on the subs. I tune my 2 memphis prs to 40hz and it sound good. loud as hell too //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gifHmmm.. Tuning is pretty high for a daily driver, I have a box at 37Hz and have little low end response.