If you are looking for SPL and didnt get it, thats was do to a poor amp match. I have had MMG, MGiiia and MG3.6 all of them I could get peaks over 100db. I used Oddysey amps then upgraded to PASS
Now if your talking you want to hear under 30HZ then the sub is needed. One has nothing to do with the other
Now if your talking you want to hear under 30HZ then the sub is needed. One has nothing to do with the other