H, Nerve. I know that some European models are like what you described. The plastic cap is placed on the speaker terminals because of safety reasons (I'm guessing that there is a regulation for it). I'd read that power plugs have the same size and spacing, so they try to idiot-proof it so that someone won't plug a speaker terminal into a power outlet.
I didn't check the web thoroughly to see if the RX-V2065 has removable caps, but someone here might know - or just do a web search if you haven't already.
Do the caps look like they'd come off?