sers, I decided soon to build a facility in my Golf 4. As it is my 1st facility, I need some support in the selection of the components! As Headunit a Alpine IVA-D300 RB should serve, which is already available! As a subwoofer I would like to use 2 Rockford Fosgate Punch P1 12S4 or P2 12S4! the Punch P1 series presents itself compared to the p2 series at the Woofern much?? my next problem is to find a suitable final stage for these Woofer! Also do I need a new front system! do I also have to change the rear boxes or is that not necessary?? if yes which front system is recommended?? Alpine, Rockford Fosgate are the ones I have looked at.. which are good and I then need for the front or rear system also end-stages?? RF P152S or T152S, are the ok?? for front or rear? or Alpine: SPX-137 unfortunately has no plan of this makes me a few suggestions with rockford or maybe also alpine components! so,w elche endtsufen, which front or rear system, etc. does not want to spend more than 800€ in total..without headunit, since I already have thx already times.. Greetz..