Is it true that you can use an xlr microphone in a speaker if you plug it into the line out port?

You can't plug in an output to an output.
This says all that has to be said, really. But I think the issue is more with the OP's misunderstanding, and calling the line INPUT an OUTPUT. Modern powered speakers often have an input that is wired in parallel to an output (often labeled "THRU" for daisy-chaining to another speaker). The input is most often a combination jack (XLR and 1/4"), and the speaker has a wide ranging preamp, to accommodate input from a line level source (such as PA board, or playback device), an instrument level source, and a mic-level source. For the OP, outputs of one device are always connected to inputs of another.
 
I always thought line out was just for attaching the speaker to a larger system, but according to a customer service worker from Guitar Center, you can plug a mic into the line out port and your voice would be projects through the speaker. I just wanted to make sure this was true; I'm terrible with microphones and related equipment.
exactly what piece of gear do you have, and what are you trying to do with it?

when you say "speaker" i have a feeling you mean something totally different than what most people are talking about in this thread.
 
  • Like
Reactions: Hoochie Coochie Man
Like the input on his bass?:p
exactly!

one thing i've learned from years of giving technical advice in the retail environment of a music store is that when somebody asks a question that makes zero sense you have to drill down past the "word salad" of misused terms and get at what they actually mean before you can hope to give a useful answer.
 
exactly!

one thing i've learned from years of giving technical advice in the retail environment of a music store is that when somebody asks a question that makes zero sense you have to drill down past the "word salad" of misused terms and get at what they actually mean before you can hope to give a useful answer.
Same for me.
Part of my job involves working with students who check out video equipment to use for class assignments.
When they check the gear back in, I always ask if they had any problems/did everything work OK?
A student, the other day said she couldn't get the camera to record.

Just so you know, the people teaching the class, with lots of letters after their names, are supposed to be giving instruction about using the equipment. We just do support in case of a problem.

So we set things up to try it it and the camera had a No Memory Card error on the screen.
"Do you have your Memory card?"
"What's that?"
"The little rectangular thing that goes in this slot."
"Yeah, I don't have it with me but I did put it in there and it still didn't record."
"Did you format the card?"
"No, how do you do that?"
:rollno:
 
as much as i agree with the lack of knowledgeable help at guitar center, i would be more likely to believe there was just a misunderstanding in either one or both directions of this conversation.