Este mozo tenia el sonido estandard, y aqui lo tienes reemplazandos los woofers por unos mas potentes..
http://www.babybmw.net/forum/viewtopic.php?t=2886&highlight=woofer
Ya se que esto es repost, pero asi te queda claro:
Base/standard spec is:
* Front doors - 1 mid-range speaker near door grip
* Under front seats - 1 woofer bass unit
* Rear parcel shelf sides - 1 mid-range speaker
That equals 6 speakers
Changing head unit or nav system doesn't change this base speaker spec (though this might differ in some markets, e.g. in Aust Hi-Fi & Hi-Fi Pro speaker upgrades the headunit). Also tweeter grills near side mirrors have nothing behind them in base spec. Listen to them and no sound will be coming out of them.
Hi-Fi speaker upgrade spec is:
* Front doors - 1 mid-range speaker near door grip
1 tweeter near side mirror
* Under front seats - 1 woofer bass unit
* Rear parcel shelf sides - 1 mid-range speaker
1 tweeter
Upgraded amplifer (more powerful, but I can't remember the watts rating)
That's 10 speakers and louder system
Hi-Fi Professional speaker upgrade spec is:
* Front doors - 1 Harman-Kardon mid-range speaker near door grip
1 Harman-Kardon tweeter near side mirror
* Under front seats - 1 Harman-Kardon woofer bass unit
* Rear parcel shelf sides - 1 Harman-Kardon mid-range speaker
1 Harman-Kardon tweeter
Upgraded 300 Watt amplifer and DSP (some claim is it the Logic7 system, but that can't be true as that system requires a centre channel on the dash. It might be a cut-down version of Logic7 however.)