1 ohm stable

yah thanks man i dont even have the audiobahn anymore i just switched it today to a mtx amp so it match the subs and i may say it sounds hella loud so you do you have a real answer?

What makes the amplifier stable at 1 amp is the output stage of the amplifier.  Yes, the power supply is important, but the impedance matching of the amplifier is entirely dependant on the output stage.  In most amps, the output comes from a gang of MOSFETs, which have a great deal of forgiveness for mismatching of impedance (ohms).

It's like this - with no speakers, the load is infinite, or wide open.  Add one 8 ohm speaker and your load is that.  Add another in parallel (+ to + and - to -), and the load goes down.  The more you add, the closer you get to 0 ohms, or a short-circuit.  The best load is usually as close to what the amp is rated and no lower than the specs support.  The amp is made to work best at its suggested rating.

Another very important consideration when adding speakers is - the lower the impedance (load), the harder the amp works.  Think about a light bulb: lower wattage bulbs tend to last longer, brighter bulbs burn out quicker.  Your amp will last longer and run cooler when it is operating with the suggested load.  With that in mind, that 1 ohm load is going to make your amp push really hard if it has a suggested rating of 4 ohms (most standard rating) - but it will be stable!

Hope I haven't blown everyones minds!