I bought 2 15 inch pyramid subs and they are 4 ohm single voice coil with 600 RMS and 1200 Peak, Can I bridge the subs SAFELY to a 2 channel Rockford Fosgate? Would you reccommend I do that or jus connect one sub to one channel? Also the specs on the box say the Frquency Repsone is 36.8 (which sucks I believe) does this mean this is the only frequency it can catch? Cuz I see other subs and they say 30-2k or something, Can someone help me out?