ALLEN PARK — For the most part since Jim Caldwell has been hired, we’ve heard him speak but haven’t seen him coach much.

With the three-day mandatory minicamp, which started on Tuesday, that is beginning to change.

Caldwell, unlike Jim Schwartz, is not a screamer.

“The fact of the matter is, it doesn’t matter if you’re yelling and screaming because first of all, they tune you out after a certain point in time,’’ Caldwell said on Tuesday. “I played for guys when I was playing and guys were screaming and yelling. Pretty soon that sounded like his normal, audible tone and you end up ignoring it. So, when I have to go up and octave or two, I guarantee you it will have a little bit different response than most people in that regard, and I do from time to time.”

He said he’s not always even keeled.

“I’m passionate about what I do, even in terms of practice. What I feel really is that I do instruction in the classroom, I do instruction when we have our team meetings and I tell them what I want,’’ Caldwell said.

“Then we go out and see if we can get it done. Today, we’ll grade it, we’ll look at it and if I didn’t get exactly what I want, I’ll point that out on film. I’ll show them what I want, we’ll come back out and we’ll go at it again. That’s kind of how we work and how we operate. There’s no need for a whole lot of cussing, screaming, yelling and all that kind of stuff. It’s a mini quiz out here. I never had any of my professors yelling in my ear when I was sitting at the desk filling out those multiple-choice questions.”

Day Two of mandatory minicamp begins at 3 p.m. on Wednesday.

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