little subwoofer project

Indeed, a z3 has only 2 seats. @ markcars, maybe check your glasses (no offence).

@ coomer, Its a 8" Caliber sub who has 100wrms power. Its a brand which is relative famous here (Europe). Its not a lot of power but just enough to be present. I tried a 10 inch but was too big to install.

@ Maxt : it sounds not that bad. Sure there is always better you know, but for me its sufficient. I'am not a great bass fanatic. It was, for me, the only way  to add a sub in the cabin. I prefered adding a sub in the trunk, but this trunk is so sealed, you won't hear the bass inside the interior

@crudeau, The amp is in the trunk. No custom work yet. I will first finish the interior. Have only to mount the tweeters on the dashboard. I'am still test listing.