Greetings audio-gear heads. I have a 300CD Coupe.

I replaced the Becker with an Alpine head unit / Amp set up.


Alpine CDE-153BT
Alpine KTP-445 amp

I don't recall what speakers I installed, but all four were changed out.

What I now have is 80% great sound. Nice and clear, but no bass as you might imagine.

What's the easiest way to jam a sub into these cars? The wall in the trunk is the back of the fuel tank. I imagine that will really impact the sound. Right?

Not much room under the front seats. I've heard it messes up seat travel.
Not much room under the rear seat either.

Has anyone come up with a solution? I don't want to shake the hood, just enjoy the tunes.

Any suggestions appreciated.

Thanks.