Something to keep in mind is the thickness of the material the terminals were designed for and the thickness of the back of your speakers. I did not consider this when I bought terminals, and the ones ...

This is all secondhand (I wasn't at home to witness it, only my wife)... I have a relatively cheapo 5.1 setup with an older JVC receiver (no video, audio only). The surround speakers are connected ...

Those speakers of yours are nice, but how long has it been since you cleaned them? If it's been a while, it's time to learn ...