I have A freightliner Columbia it has 2 speakers in the sleeper (6x9) and 1 in each door. The ones in the door sound like poop And very midrange the 2 sleeper speakers sound better I have to run it 3/4 to the sleeper and 1/4 doors to get A decent sound. It's no the stereo it''s the speakers anyone know of a place that does big truck stereos I also would like to get A subwoofer installed possibly under the bottom bunk so I can get that thump I like the bass guitar to rattle my ribcage and the kick drum to kick me in the chest. You know BOOM Lacka lacka BOOM.