I recently purchased a new Alpine PDX 1-600 amp, which is supposed to be pretty good, according to reviews. I'm planning on putting one 10" Rockford Fosgate Punch P3 subwoofer with a ported box in my trunk. I know the exact model and everything, I just don't know if 2 ohm or 4 ohm is better. It looks like 4 ohm might be but I'm not sure. Remember I'm only getting one, not two. Please look at my links below of the amplifier and subs to tell me which one is preferred. Thanks.

Amp:
http://www.alpine-usa.com/US-en/products/product.php?model=PDX-1.600&lang=en&tab=F'

2 ohm sub:
http://www.rockfordfosgate.com/products/product_details.asp?cat_id=4&series_id=31&family_i d=11&item_id=108286&locale=en_US&p_status=


4 ohm sub:
http://www.rockfordfosgate.com/products/product_details.asp?item_id=108287&locale=en_US