Hi, I’m new here in the forum. I wanted to install a new sound system. I wanted to replace the speakers in the front of the doors and make a power amp + bass tube at the rear. I thought about the speakers which have about the quality here: http://www.pioneer.de/en/products/25/131/201/TS-A2011/index.html The power amp is a bit older, but since I get the at a good price + bass tube: http://www.blaupunkt.com/en/7607792103_main.asp The exact data from the bass is familiar I haven’t, but my uncle said she’s good. What I wanted to know now is, do you think that’s enough or should I put some in the back? Or maybe change something else? And what dimensions must the boxes have for the doors?