2007 superb laurin & Klement audio system

Hi all,

so I have a superb listed above,

I have upgraded the audio system basically as I needed a handsfree phone kit and to play my music from my iphone

so I have done away with the DX nav system that had an amp in the boot and cd changer.

now my question is, does anyone know if there is a hidden sub woofer in the car somewhere cos I cant get it to sound like it did.

My new Audio system is a pioneer and ive replaced the amp with an alpine, so the quality is good, I just haven't replaced the speakers as I don't think I should need to.

someone help )

Many thanks

mick