Randolph, welcome. It's possible to connect two sets of speakers to run in parallel from the 3380 terminals if the speakers don't have less than a 8 ohm impedance(which would result in a 4 ohm impedance when the 8 ohm speakers are run in parallel). What exactly do you have in mind though? If you're thinking of using the CSWs near the Axioms, it's unlikely that they'd blend very well with the better Axiom sound. You don't have to worry about overpowering them though, only the amount they'd need at a given sound level would be used; the receiver doesn't force unneeded power into speakers.
