Rel sub x-over fs/click

I'm not sure what you are asking but I can't tell you how hard it is to set up a subwoofer without measuring what's actually happening in the room. 

I did change the rel to a svs sb17 and I would like to have the same crossover settings. But I dont know the x-over fs I had on the rel only that is was around 12 clicks 😀

I have  Rel T9x's, not sure if your sub same setup. In any case my Rel crossover settings go from minimum 30hz to max 120hz, 39 clicks. So, this means aprox. 2.31hz per click.

On my pair of S-812's both the gain and the crossover are set to 10 clicks. Of course, there are many variables to be experimented with.