I read the ohm-faq, but i'm not that good at math, so I kinda hope one of you guys could solve this one for me... My friend gave me these two DJ-cabs, that a friend of him built. One of them doesn't work, though... It has two 15" 300W 6ohm speakers, plus two 6" 160W 6ohmsand a tweeter. All speakers are connected to some splitting-filter, the red cables from the 15" soldered together, and the black ones soldered together, same with the 6". The tweeter seems separeted, except the black cord that is together with the red ones from the 15":s. I was thinking of using them with my poweramp (phonic max2500, 2x750W/4Ohm (1x1500W/8Ohm), but I´m afraid to blow it. Can I use it in bridge mode safely? About the one that doesn't work, I've checked all connections, nothing is loose. What could be wrong? How can I troubleshoot it? Thanks in advance!