WHOA COWBOY!!!
Series 2 4ohms loads will give you 8 ohms....not 4!!!
IF you parallel the VC's, youll get 2ohms, then parallel the subs, youll get a total load of 1ohm
BUT.......
A bridged amp will see 1/2 ohm. BE CAREFUL. Only if you have a mono block or something will it effectively be 1ohm.
If you want to be safe, series the VC's to get 8ohms, then parallel the subs to get 4, then the bridged amp will see 2ohms. I dont know what that amp will do. Find out if its really 1/2ohm stable before you go 1/2 ohm setup.
-Spy