Ok to start it off I need to explain why I want to know the answer. I didn't vetch my car on fire or blow a fuse or anything, I was expecting to blow and fuse and was wondering why it didn't. More of learning than problem shooting later down the road ok so I just hooked up my sa-12 on my hif1500d running about 1000k rms to it and it pounds very happy. But I figured I would have blown my 100a anl fuse on my 0gauge power wire by my battery but it didn't, again no problem with nothing that isn't broke and I didn't blow the 50a anl fuse at my distro block to 4gauge wire to amp. I was figuring I was going to be pulling more than 100a at the power wire with my other amp added in as well but it seems to be holding. My question really is why didn't my fuse blow? Well I know the stupid answer is "because your not drawing more than 100a" but can anyone clear things up it me a little? I did order some 250a fuses for my 0gauage and some 150a for my 4 gauge wire cus I figured I would have blow my other ones on the first song I played lol. I'm going to work so I won't be back for a few hours if you have any more questions ill be more than willing to answer them in a few hours. Thanks to everyone how can shed some light for me.