so you got that poweracoustik 520watt amp...
check it out, if you only have ONE terminal cup in the back of the box, your going to have to bridge the amplifer (if you look on the amplifier by the terminals, you'll see a picture of a speaker that appears to be in the center of both channels, there are lines going from that speaker to the negative on one channel and the positive on the other channel...wire the subs how it is in option 2... that way you will get 300wattsRMS x1 @ 4ohms...
if you have TWO terminal cups, then wire each sub like this:
both way would let you get the most out of your amplifier, which is 300wattsRMS...
i have that amp, and the 820watt amp, and the 300watt amp, they're decent amps in my opinion, for the amount they cost, they are well worth it...
the amp is 2ohm stable stereo and 4ohm stable bridged so both ways i described is safe...
happy wiring...
-qs
t