well you need to tell us the impedance of the subs, (dual 2 ohm, dual 4 ohm, single 4 ohm, etc). But without knowing the impedance i can give one suggestion. the JL 1000/1 is 1000 RMS at like 1.5-4 ohms so if the subs could wire to one of those which im almost posotive it could then that would...
You should always try to make the box to the recomended specs. If the box is too small the subs may not sound the best they could.
If the box is gonna have to be small you might as well just find the specs for a sealed enclosure and do that...
gain is most important knob of them all really....all you have to do is turn yer music on to a good tuning sound....for example if yer radio goes up to 40 then go to like 25-30 or wherever it sounds the best but not too loud..
Play with the gain knob and set it where the subs have no distortion...
well from what i found for specs on the autotek subs...one sub is 500 RMS. so if thats right, that kicker amp couldnt even push one to its full performance.
The kicker zx500, alpine mrp500, or the rockford fosgate 501s would be fine...
Theres many good 500 watt RMS mono block amps out there that would be good for that 15 kicker.