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First off..
A 12V power supply from a computer PS is the wrong voltage..
I know, you're lauging, but...
At 12v, you car battery would be nearly dead. Many, if not all cars have a full charge/charging voltage of between 13.8V-14.4V DC.
Next, 125W RMS for each sub would be equal to 250W RMS total. So, think about the efficiency of the amp. 250W RMS out would be somewhere around 500W in.
So, at 13.8V and 500W is like 36.25A; unless you have a comp PS that could give you around 40A @ 12V; though you would lose efficiency by attempting to run the amp at 12V.
Second, you would really have to consider what kind of box/enclosure that you would want to put these speakers in, there is a lot of noise associated with moving/bare woofers. Look into a bandpass box for home use.
Try looking for a 40A 13.8V supply, either new or refirb if you're interested in doing this.
-SF
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