We recognize where sound comes from for the most part, by the delay time for the sound to reach one ear compared to the other. It is a common myth that frequencies that are longer than the width of our head are hard to localize. This is not true. Lower frequencies are localized by the difference in pressure from one ear to the other. Next time you are at a live performance, check it out. A car is so small that the pressure is equal on both ears but in a larger venue, you can tell where low frequencies come from. A big kettle drum at a concert is a good test.

 

Well yeah any less than one would be unproductive

 

One important thing to note, if you are going to be running your subs in a stereo configuration, make sure that each subwoofer is in its own seperate chamber, or else you can run into problems.

If you are just looking for the wiring convenience of two channels, consider running a mono signal into the amp. Some amps will even have an option to convert a stereo signal to mono (my old soundstream amp did, not too sure about others).