I personally prefer the lower tuning in a car as I like my music bass heavy. But, lv_v is right, most people won't want that low in a car. If you're going to tune that low, maybe you should do a sealed enclosure with careful EQ'ing. It should sound about the same, and save a boatload of trunk real estate.lv_v said:The 26Hz tuning may be a little bit low for a car; cabin gain usually aids the bottom end so anything lower than 32-34Hz is not necessary.