Originally Posted by CombatNinja
Make sure that your device has no EQ active.
If your in-car EQ is set to bland, and your phone has eq, surround, 3d...etc turned on, there will be a lot of difference.
06 330i 6mt Spt- Eibach Springs, BMW Perf Susp, Supersprint Exhaust, BSW Audio
94 325i 5mt 4d- M3 springs/susp, Z3 wheels, Chipped, Intake, Exhaust= FUN!