The chip inside the Cube's amplifier module is a TriPath TA1101B 20W digital amplifier, so indeed a TriPath amp is a terrific match for these speakers. They are 8 Ohm impedance. The TriPath amp is a BTL output design (neither speaker wire is grounded - like a car radio) so the plug on a DA G4 has to have 4 contacts. I assume the DA has the same TriPath chip (anybody with a DA G4 confirm that?) The speakers themselves seem to come from 2 Asian suppliers to H-K, the silver frame / black surround jobbies from one, the white frame - white surround ones from another, but both have the same specs. They are quite nice drivers from the H-K / JBL Odyssey series.