Is this 250w RMS for one, or both subs combined ?

Also, I would look for a Mono Channel Amp. Run the subs in a paralell, ( look on, www.the12volt.com ) for specs and such.
Are the subs single, or duel voice coil ?

If single, do the same thing I am doing. I have both subs in a parellel in the box, running a Mono Amp, at 2ohms output.
Because two 4ohm subs in a parellel need a 2ohm amp.

Sorry, I am still new to car audio.