What is this (Audio) connector called and where do I get an Adapter?

[Paul F.]

I have this, uh, thing...
It adapts the output of the CD player to a professional Public Address amplifier we have here at school.

Trouble is, we want to adapt the output of a Titanium Powerbook headphone jack to the same large connector, and taking this CD player stand apart isn't going to be an option.

SO... learned folks;
What is that large connector called, and who makes an adapter to go to "headphone/speaker jack" to one?

You can't see it in the picture, but there's a circuit board on the other side of the jack... so I know it's not just a plain, straight, adapter.
But I also know that SOMEONE must make one, since I have THIS one!
I just need to know that the stupid thing is called!





Many thanks!