I was there with what John is saying, Axiom states they are good down to about 60, so even say 80 to be safe, but I personally do have a drop at about 95 hz. It's possible it's just my setup for sure and it would be nice for someone else to test to see, but I think it's safe to say they will need a sub either way. I haven't seen an actual graph on them, just the published specs.