I don't know of any Sony amps that are 1200 watts rms. Peak power is probably 1200 watts, but peak power is next to useless. RMS power is much lower, and a much more meaningful measure of potential output. (And often efficiency, for subs.)
Get ready for a whole bunch of assumptions!
Let's say you have this Sony amplifier and your RF subs are these.
That means your amplifier is claimed to drive up to 900wrms into 2 ohm mono. Looks like the RF Punch 3 (P3) subs are all dual voice coil, so I hope you have dual 2 ohm coils. (If you have dual 4 ohm, I can post again with suggestions, but it won't be as good.) Assuming you have 2 ohm, wire the coils serially, and then the subs in parallel with each other. On the RF site there's a Wiring Wizard tab. Click that and you will be doing section 2, picture 2. 2 ohm mono.
Now, in theory, you have 900wrms going into your subs.
Next element of loudness is the box. On the RF site, click the Box Advisor tab. Notice how they don't show more than 1 woofer? From this I would assume they should be isolated from each other. If you make a single sealed enclosure, put a divider between them. Looks like the ideal space for sealed is 1 cubic foot, and .75 - 1.25 cubic foot will work. Easy.
If you want it to be loudest, that's ported. Except it won't as a broad of a range-- it will be loud in the port tuning frequency, and not as loud as sealed otherwise. Honestly unless you have great door speakers playing low, don't do a ported box-- it'll sound bad. They're also more difficult to construct, but I played with RF's Box Wizard a bit and it's really nice. You can probably build a ported enclosure if you want, and it looks like the ideal size is much larger, 2.1 cubic feet is the target. With two woofers, you're talking about a really big box. Did I mention that sealed is the way to go? :)
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