Wiring Help!

most 2-channel amps are NOT 2-ohm mono/bridged stable; they can usually do a 2-ohm stereo load, but that's a very different kind of thing.  I would recommend doing a 4-ohm mono load as this will get the most power out of your amplifier while still making sure you don't fry it.  Here's how the subs should be wired up:

Once the subs are hooked up like above, the single 4-ohm speaker load will go to the amp's left positive and right negative speaker output terminals.  You'll just leave the left negative and right positive terminals alone.

Actually check the specs of your amp cuz some amps will put out more power total if you do a 2-ohm stereo load like was mentioned previously.  Technically the power output should be the same as a 4-ohm mono/bridged load but I've seen it different before on certain amps.

Also, as for doing a 2-ohm stereo load, it's pretty simple.  For the amplifier's left speaker output, you'll hook up the two positive terminals from one subwoofer to the positive speaker output on the left side.  Then repeat with the negative wires.  For the other sub, use the amplifier's right output channel.  Another way to look at it is it's kinda like you're hooking up 2 subs to each of the amp's 2 output channels.