nope,killer,that's wrong.you are going backwards.if i had a 600w @ 8,and put 2 in series for 16 ohm and used a 600 w @8 ohm amp then the amp would work half as hard with the easier load, around 300@ 16 OHM,or something to that effect.but being as i have 2 drivers in the same enclosure,i'll keep them paralleled for integrity(and to keep it as tight as possible)although before i took my subs out of my truck i had 4 4ohm subs,series/parallel to maintain 4 ohms,but all in separate enclosures so i didn't feel bad about what i would consider a basket case.if i would of had an 1 ohm stable amp i would have paralled all of them.
i've messed with various configurations with them subs,and 2 running @ 4 ohms dual mono had better sq than 2 series @ 8 ohms mono , i lost even more sq but gained spl running 4@4 ohms which is why i've taken out the subs and am redoing it,back to dual mono 4's.i'm getting too old for the major spl,although i enjoy driving by hardee's where all the kid hang out with their "i paid so-n-so to install this for x $'s" and all heads turn in disbelief, how can an s-10 be that loud?