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amps and wiring kits are very optimistic on the output. If you want proper wire, buy some welding cable "0" or "00" guage. That solves the power delivery. Put a 1 Farrad (or more) capacitor near the amp, that solves the surge power issue. Make sure the box is suitable for the subs. Lastly I'd say do some research and find the right amp that can deliver the clean, huge current required to move some serious air!
Well you really can't run both speakers on one term. because you will over heat the amp , unless your amp is rated at twice the capability of your subs , Then if so , Try positive to one sub , then neg. to the other sub , then bridge the remaining positive to the remaining negative terminal , But it is really best to get a two channel amp for your subs !!!
Alright first suggestion is to get a different amp. Cause for one a mono amp is meant for just one signal (one speaker) also you need to make sure that you get an amp that is powerful enough to run the subs. You need to find out what the RMS of both speakers is. From just a few moments online I found a Kicker 12" Comp. subwoofer has an RMS of 50-150 watts. So you need to find a 2-Channel amp that has at least 300 but you should get one that has at least 400 just to be save. You can find a Dual 2-Channel 400W amp at Walmart for $55 and get the 600W wiring kit for $25. You should just use the inside speakers for mids and highs and allow the subwoofers to run just low frequencies. That way everything will sound correct, and not ruin your subs if the do not have a voice coil in them. It's fairly simple to set up a system with an amp and subs, you just need to make sure you have the right parts.
If it is an open air sub ( hole with mesh in the center of the magnet) no ports are required, and the box should be sealed on the inside with silicone sealant. If it is a closed air sub ( no hole in the magnet) you need a 50mm port about 120mm long Box size will be 13 inches x 13 inches x 13 inches
The Kicker 08ZX400.1 would be a great amp for your subwoofer. It will work into a 4ohm load with no problems.
But you can buy an amp with more power, looks better, has a smaller footprint, and cost less than the 400.1. I'd look at the Alpine MRP-M500. Take a look at it here at Crutchfield. The M500 is also easy to install, runs cool, and is very efficient.