jbl 1200.1

yup, just hook both + from each sub to the positive on the amp, ,and both - on the subs to the - on the amp, , that will get you a 2 ohm load.

Keep in mind that if your head unit has 4 volt outputs, the gain should be turned all the way down.  It will produce full power at that point, and you will be clipping the signal if you have it turned up any.  Also note that the amp has tested over 1400 watts in the magazines, so they are under rated.  I think that amp is responsible for the death of more Brahma's than any other amp just because the customers didn't understand how to set it up right.

Steven Kephart

Adire Audio

You are probably thinking of the gain as a "volume"control, which it is not. The one and only function of a gain control is to match the amplifiers input sensitivity to the headunits output voltage. It should be set (correctly) and never touched again. Check out this link - http://www.jlaudio.com/tutorials/index.html  and click on Interactive Input Sensitivity "gain" setting tutorial.    I don't think that a 1200 watt 2 ohm amp is listed on their chart so you can use the formula (P*R)^.5.  This will give you a voltage of 48.99 VAC. (you'll see what I mean)

I don't know this amp, but if it is mono and has two sets of speaker terminals, it is probably internally bridged, meaning that the 2 sets are just for wiring flexability (i.e. if you hook up a 4 ohm woofer to eack terminal the amp will see a 2 ohm mono load.) Like I said - I don't know this amp, so do NOT hook it up like this untill you find out for sure.  I'm just trying to point you in the right direction in your quest for knowledge...although I am pretty tired right now, might be just typing in my sleep, lol.