Ok. now after playing about with car audio for some time, I have decided that I am going to get a new sub to replace my ageing JBL which is honestly a bit worse for wear now and really lacks the sort of control I like in my current music tastes. I am looking at getting a new amp to drive it which is the Alpine MRV F345 to replace my Vibe VP2 and BB1 (hopefully shave a little off the cars weight too in the process LOL) I am configuring it to stick one pair of channels to some components up front and bridge the second channel to run the sub. This bridged output is at 4ohms. Now what I need some help with is picking from either a dual 2ohm sub or a dual 4ohm sub to connect up to the amplifier, which do I need to buy? How do I connect it up to show the correct loading to the amp? I have read some of the FAQS on TA forums but they dont really cover this situation, only running two channels to the sub or running it from a 2ohm source. Any of the ICE bods help out a "intermidiate" noob?