I purchased my Apogee Duetta Signature ribbon speakers in 1991, and have spent the last 19 years building around them. They provide magical transparency, soundstaging, and musicality. I have paired two matching Paradigm Reference Servo 15 subwoofers with the Duettas. The Duettas are powered by a pair of Bel Canto Reference 1000 Monoblock amps. I use the X-30 crossovers which come with the Paradigm's to make the subs work with the Duettas.
I’ve got a pair of Signature Series IIs (original owner) running with a BAT VK-600 w/ BAT pack, BAT VK-5i tube preamp. I can’t imagine why a subwoofer would be needed. The bass tightness that goes down into the inaudible range where you just feel it is astounding with these speakers. Hit any big challenges when separating out to a sub?
