i just got 4 of them right now
but I use the three velodynes in the HT prior to these.
I'm moving the Velo DD18 to my bedroom, the Axiom EP500 to my PC, the Velo DLS-5000R pair as stereo subs in my HT#2, the elemental design subs as LFE for my HT#2 and the SVS PB13 Ultra pair as LFE for my HT#1