So as soon as I have my car again (workshop) I want to make a few improvements. Unfortunately, I don’t know how to do it with the boxes & amplifiers yet but I like to learn about it ;o). I’ll list you quickly what I’ve installed at the moment so that you understand what it’s all about *g*: VORNE: I’ve installed the audio system PX 130 Pro – Performance Line in front (I think I’m good for the price & I can’t afford doorboards for 16’s -.-). öner die dabei dabei (Combo) Hinterten: Audio-System CO 165 *really ridiculous* Luggage compartment: Audio-System Twister F4-560 [Stainless steel] ;o) Bass reflex housing (replacement bracket 35-40 liters) equipped with the Audio-System X–ion 12 So what I wanted to do now is the following! It’s just about the part in the back, with the rest I’m too happy. The boxes in the back are already bullshit boxes ;o). In addition, the F-4 is fully occupied with bass and boxes in the front. That means the coaxial system in the back runs over d I have received the following offer: Twister F2-280 audio system (used) for 190€ instead of 300€ PX 165 per audio system for 150€ (then have also 2 tweeters playing from behind) Are these good prices??? I want a very good performance yield so that the 16’ers balance the smaller 13’s in their effect ( The guy wanted to do it just that way that my F4 then amplifies the boxes and the F2 is paired alone for the bass. (as far as I know it’s not possible from the slots at all). I don’t know what the things are good. Is the power amplifier good? The boxes? I just want what the really pressure is doing with the boxes… I also saw the audio system RX 165 Pro Performance Line, but do they make a big difference to the PX? Do you have any more ideas what you want to do? I am happy about good advice and possibly links for good boxes/power amplifiers. Mfg Snuff.