Underpowering subs?

well get an amp that is 100 to 150 watss less than what the speaker can handel so you dont have to worry about blowing that thing up . my store has been used as demo store and what we do is test the power of speakers and whe use all different amps to see how the speaker acts so we know and we can back it so basically our goal is to try to blow speakers and see what they can handel so then we determine what we buy and what not to buy.

yes it matters dual 4 ohm coils is your best bet cause if you get a good amp it will make it 2 ohms and good amps can handel it.

So If I opted for the dual 4 ohm voice coils and wired them in parallel to an amp.  Then the 2 subs would each of a 2 ohm load each right?

And if I were to get the JL 500/1 that has a rms of 500 rms into 4 ohms, would each of the subs be getting 500 watts each?

Yes, each speaker would be 2 ohms. So a total load of one ohm.

I'm not dead shure about the JL amp, but make sure any amp can handle a 1 ohm load if you wire them both in parallel/parallel (voicecoils/speaker-to-amp) or a 4 ohm load if you wire each speaker as 2 ohm and then both speakers in seris to the amp. This is the way I'd suggest.