I am from Holland 1 in Holland Gemany Belgie of dis car!!! (Propper Droppen) 1x 10 sundown audio 1x SPL Versterker 3000 watt (Show Audio) 2x 10 inch rockford 1x spl versterker 1600 watt 2x rockford versterker's van 300 watt 2de accu achterin 45 amp (propper droppen) 20 hertz 129.3db! 25 hertz 131.8db! 33 hertz 135.8db! 40 hertz 136.8db! Eind score 134.1db power by lammers audio! (show audio) 142.5 db in car