The posts are exactly like Matt said, just pry the caps out of the ends of the binding posts. I used a small screwdriver. Once removed, it accepts banana plugs quite nicely.

Sorry I didn't respond earlier 99, the thread must have escaped me. As for how well the CA will play with PSB's, I have no opinion as I've never heard the combination. I use my 540a to drive Mission 780a Argonauts, large towers from the late '80's that combine excellent efficiency (95dB/1w/1m) with a somewhat challenging 4 ohm nominal load. The bass response is equal to the Rotel RA-01 I demo'd, but not as robust as the NAD C320bee. The areas that I felt it bettered the Rotel and Nad were low level resolution, aesthetics, and value. The first point was paramount for my application as this is my office rig and I can't exactly rock-out, you know? Some amps need a fair amount of juice before everything will coelesce, not the CA. I've had it for over a year now and I'm very happy with it. Considering it's driving 4 ohm speakers for around 10-12 hours a day non-stop, you can't really ask for much more from a $250 integrated.