here it is, i have the alpine mrd-m1005 amp, 1000W rms and i want to get either one 12" type X sub 1000w with custom ported box or two 12" type R's 500w rms with ported box. what is better two type R's or one type X?? 2 R's vs one X.. what is gonna be the LOUDER!! system?? low bass and quality all that is fine.. but what is LOUDER?? pleaaase help. thanks.