I'm using the hybrid head:Definitely interested in checking out these new cabs as well. George has had an el whappo in the shop for some time now, and has been touting Tecamp recently, so I'm guessing anything he would put his name on must be able to seriously hold its own. That being said, as a Tecamp user, I can tell you that my tecamp rig sounds ridiculous with an F bass. Match made in heaven.
Tom what Demeter amp are you using, the tube amp (VTHF300M) or the HB600 hybrid head (HBP-1 with an attached poweramp)? That 300 watt tube amp has been on my lust list for years, probably the best sounding bass poweramp I've ever heard...
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And I would describe my tone with the Demeter head and Accugroove El Whappo as celestial bliss... with a back ache. My cabinet weights 88 lbs and the head in the rack isn't petite either, but once this rig is there, and that tone fills the room... I become the undisputed alpha male in the room.

So you write "rig." That means you have TecAmp amp and speakers?
Do you have the Combo 210?
Or the S210? Or the M210? Something else?