Cartridge Impedance

Thanks to all! You've answered my question.

I was talking about adjusting the impedance setting on my phono pre-amp.

Hey guys, as the original poster I just want to say, "calm down"! In my original post, I made the error of saying I wanted to change the impedance of the cartridge. I meant I wanted to change the impedance setting on my phono stage, knowing that the response of the cartridge would change. Some of you understood that. And yes, I just want to know how to set up my system. I don’t give a rat’s tush about all the other stuff! It was a simple question and the first 3 responses told me exactly what I needed to know.
I’m not a regular poster here, but I do read a lot of things with interest. But one of the things I’ve found is that when someone asks a pretty straightforward question, the discussion quickly degenerates into a lot of things that are irrelevant. I’ve seen someone ask, "Am thinking of buying only either cartridge X or Y. Any recommendations?" Then someone will say, "I’ve not owned either, but you should try cartridge Z." I mean, WTF! All he wanted was a straight answer. Ok, end of rant and thanks to those of you who answered my question directly and maybe threw in some USEFUL information.
Yes, testing is the name of the OP game!

Poor English is something up with which I shall not put! Ha! 
Your pedantry is beyond my annoyance. But I thought your post was cute.

Ok, FINE! Jeeesh!