which JL sub model is it? then only can know enuff power or not from the amp.
since the jl sub u said is DVC, and assuming it is dual 4ohm voicecoil...
if u wire each sub in parallel and then together in series u get 4ohm
if u wire each sub in series and then together in parallel u get 4ohm
if u wire each sub in parallel and then together in parallel u get 1 ohm
if u wire each sub in series and then together in series u get 16 ohm
so unfortunately with all the configurations u will not end up with the 600W from the MA Audio amp, which was in 2ohm
i suggest u sell one sub, just wire the remaining sub in parallel, u end up with 2ohm and u will get 600W from the amp.
if u still want to use 2 subs, when u wire it to 4ohm, u get 300W from the amp, and then each sub gets only 150W, not enuff.
or u can search for a more powerful amp that can go down to 1ohm and have enuff power fro the 2 subs. if each sub is rated at 300W rms, look for an amp that can give 600W @ 1ohm, or 600W at 4ohm, and wire them as stated above