Okay, if you wanna run 3- 12" Alpine Type R subwoofers which handle 1000W max and you want to supply sufficient power each of these subwoofers... you are gonna need around 500W per subwoofer. Figure each subwoofer would like to get about 150W RMS. One of the options is to get something like the Alpine MRD-M1000 amps and connect all three speakers in parallel. This would give each of the three subs an actual Mono load of 2.67 which gives an equivalent ohms/channel to be at 1.333. Personally I dont like to drop any kind of load below 2 ohms when you are dealing with that much power. Though some amplifiers say they can handle less of a resistance, no matter what they tell you, that small of a load looks a hell of a lot like a short circuit (which usually is not a good thing unless you plan on building an electric heater). Anyway, the more speakers you have connected to one amplifier, the more work that amplifier has to due which leads to a shorter life. And besides an amp that puts out that much power is probably going to be about 2 feet in length to which you can not alter as opposed to getting three smaller amps that you can mount in different locations. Its really not that hard to wire three amps as opposed to a single amp. The hard part is routing the wires from the front to the rear, after that its distribution blocks and a relay for the remote wire.