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Originally Posted by BoCo
The subs have a sensitivity rating of 87dB. Two together with 1 watt going into each would hit 93dB in free air, even higher inside the confines of a car. 100w into each would allow you to hit ~113dB which is enough to deafen you permanently over a period of time. To get 100w into the subs, you need an amp that can hit 200w per channel, since they are about 50% or so efficient.
Your smartest bet is 1 sub with an amp that can hit 100w RMS. At that volume, in free air, you could easily hit 104dB, which would be more than enough to do permanent hearing damage, which is what I assume you're striving for.
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Someone has been reading a text book
Where did you come up with those numbers? It all goes out the window when you actually put things together in the car. The textbook 3dB gain from a doubling in power/cone area is rarely attainable. 104dB at low freq is hardly going to make anyone go deaf. And todays class D amps can achieve greater than 70% efficiency. And with power available for less than a dollar/watt - always buy as much as you can afford.