So a month ago i got a kicker zx650.4 amp and a 12'' Hifonix Subwoofer 800watts max/ 400 watts rms
It sounded really beast but unfortunately the sub died from too much power.

I went back to the shop and got 2 10'' Sony Xplod subs 1200watts max/ 450 watts rms, which are much stronger than my previous sub yet they dont even sound close as strong!

Why do they sound weaker than 1 sub with less power... makes no sense

Anyone know what the problem is?
Thanks.