Equalization with REL six pack

I am preparing to set up a REL six-pack for the first time. Though I bought the subs used, I am paying a local dealer to set them up. One question I want to have perspective on before setup is this:

I use a Rives PARC attenuation-only equalizer that is indispensable to tame room bumps in the 40-80 hz range. (yes I know room treatments are more deal but let's put that aside please)

When I set up the six-pack, my thinking is that I should put the subs in place, stacked approximately where they are supposed to be just outside and slightly back from the mains, and with the subs unplugged, get the mains to sound the way I like with equalization. Then go through the whole six-pack setup. This makes more sense to me than bypassing equalization during setup and equalizing after the six-pack setup, since subs have separate volume control and can be set accordingly. I suppose I may do slight attentuation adjustments afterward as well. 

The alternative of bypassing equalization until after six-pack setup seems less appealing because much of the six-pack "by ear" setup could be thrown way off by adding significant attenuation after the fact.

Thoughts? I am not mentioning system components because I don't think it matters, but if anyone disagrees I am happy to give a rundown. My mains are Verity Parsifal Encores, flat to around 28hz.

Thanks