You already have the answer but you dont want to listen. What is "bridging the subwoofers"?
You have two dual 4 ohm drivers. Wire each to give you a 2 ohm load and hook each to ONE channel of the amplifier. PROBLEM SOLVED.
Exactly why I asked this:
So, OneFalseMoce, can you help us help you by answering this?What is the RMS output of your amp?
1.) Each channel (unbridged) at 2 Ohms.
2.) Bridged at 4 Ohms.
3.) Bridged at 2 Ohms.
[edit] what subs do you have?