I have these questions in another thread but it got off topic so I am reposting here. I had 2 sonys and 2 polks the polks were powered by a 1500watt peak kicker 5 channel and the sonys were powered by a 750 watt peak bazooka monoblock i wanted louder so I took the sonys out and I bought another pair of polks the same vented box... It is not near as loud as it was with the sonys though. I was told this was due to my subs being more for good sounds than being loud and I also was told that the sonys were creatign more vibration because they were sealed and now I have 2 ported boxes. So I was told to upgrade to a better amp so i just ordered a Hifonics 900x1 @ 2 ohms and 1200x1 @ 1 ohm and both my sonys are db's and 2 ohms. Im try to figure out what the best way is to set all this up now... Should I even try to run all 4 off this one super d mono or should I hook one pair up to the hifonics and hook the other pair to the kicker. Or should i just return the amp and buy a different one that is 100$ more expensive but is 1200rms @ 2 ohms and 2000rms @ 1 ohm? I was told that each sub is 4 ohms and the box together is 2 ohms so if I twist the wires and put them into the hifonics that im only getting 600rms a box and 300 a sub. Although that does not make since because im new to all this I thought the lower you got in ohms the better and louder it got and the higher in ohms it went down. So I was informed i was getting 900rms a sub but then I was told instead all 4 are getting 1200 rms @ 1 ohm and its split between the 4? Im just so lost and have wasted so much money and I just want my system banging... Sorry to anyone who has been trying to explain this to me im not very edjucated on any of this yet I just need to know what to do.