Because in my Peugeot 207 vibrated the door panels when the Bass ran through the standard speakers had to remedy her.Den subwoofer in the trunk placed, screwed, Wired, remote control on full blast (Can all of my DEH-6300SD CD-MP3 Set Tuner (iPod / iPhone dock, USB 2.0, AUX-in, SD slot)) and those under the rear bench gelegt.Am Radio I put the crossover frequency (LPF) at 63Hz, the high-pass filter (HPF) to 50Hz and the bass intensity -14dB and it sounds gut.Hätte really never thought that such a big sound come from the small thing.