I purchased my speakers used. One of the binding post has always had the plastic protection plug jammed in there where a banana plug would go. I have tried to get it out over the years. Finally, I have decided to just replace the binding post. I took out the bottom woffer and had a peak at the crossover. There are brass nuts on the crossover with the back of the binding post attaching. Looks like I have to remove the crossover too as I'm guessing there is another nut behind it holding the crossover in place? Have not yet called Mcintosh yet. Thinking that if I am going to go through the hassle, I might upgrade the binding post to some higher end ones like WBT. The ones on it now looks very similiar to the Connex models?