ohms help please

isn't it

6 ohm dual vioce coil  2x so in parallel you'll get 3 an so on 4=2

im confuse

my subs are mtx 6000 they are not dual voice coil though. and i made a mistake before they are 4 ohm subs. thanks

Three SVC 4-ohm subs in parallel will result in a 1.33 ohm net load on the amp.  This is the "best" in terms of squeezing every bit of power and achieving highest SPL that you can do with this equipment.  You probably have a Brutus BX1000D, which can handle this load and will deliver approximately 800 watts RMS, or 260 watts or so to each woofer.  This is about perfect for an MTX 6000, which is rated for 250 watts.  Set your input sensitivity (gain) properly and you will get the "most" out of this setup.

Now let's back up a second, do you have one of those pre-loaded MTX enclosures with three 6000 series subs in it?  If so, they are supposedly factory wired for a net 4-ohm load on the amp.  Your Hifonics will deliver approximately 350 watts into 4-ohms.

The diagram that you have from Rockford is a parallel to series hook up. look at the driver's ( they are hooked up in parallel and the voice coils of each driver's are hooked up in  series ). This will result in a higher impedance load on the system.

The woofers in that enclosure are 12-ohm speakers.  Three of them in parallel get you to a 4-ohm net load.  Your amplifier is operating into 4-ohms (which is just fine) and generating 350 watts.  In order to get the most "pound" out of that pre-fab enclosure system, you need an amplifier capable of 750 watts into 4-ohms.