Just to follow up: I picked up an SPL today and I'll get some better information with it over the weekend, but last night I raised my m22's from 16" to 24" and the dip at 125 went away! Not only that, but I heard decent bass into the 70's and 60's where before it tapered off at around 80...

--- My stuff: Onkyo TX-SR701 Axiom M22ti / VP150 / QS8 SVS PB12-Plus/2 sub