I have an oldie (marantz 2500) with pin connector outlets for the speakers.  Is there a  place I can find a part to change those to spades or bananas?  I was told that the pin connections will be bottleneck to the flow toward the speakers, and I was told that a few times from different individuals.  I don't know what amount of loss they cause, but I may as well modify them if that is possible.

Thanks