5.1 SETUP Question

[obiwopkenobi62]

Hi all,
maybe someone can help me out with this. I decided to put a panel in my wall next to my media cabinet. It's basically a speaker jack panel. I will have banana plugs on the outside. The back of the panel is inside the media cabinet. Here is what I need help with. The plug for the Sub on the outside is no problem. Reg audio jack. On the back of the panel however the hole is much smaller and won't take an audio jack. I thought it should match the plug on the Sub preout on the back of the receiver(should be same size) but it doesn't. Is there a special sub plug that I don't have?
If I can't remedy this I will skip the sub plug on the panel and run the sub audio jack direct from sub to receiver.
Thanks for any help you can give me.