Good evening, I drive a Porsche 944 and would like to build a small subwoofer box in the trunk, but it has to be so flat that the boot cover still fits over it. Actually tomorrow I wanted to take apart my old bass roll, which has a 30 bass and build me a box that meets the requirements of my trunk. My maximum installation height is about 20cm and then I still have the problem that the subwoofer, which in such a construct As an amplifier I have built a HELIX HXA 20, which in combination with the tube from the bass was completely enough for me, so nothing should change about it. My question is now whether you would build this just like me, or if you have a better idea, maybe with a small subwoofer. The box should definitely be placed in the trunk and not for example in the side pockets or the spare wheel dump. Thank you very much in advance for your help.