[Workaccount2]

No, because the drive circuit for a speaker is the opposite of the circuit for a microphone. The output stage of a speaker amplifier is just that, an output. The only way to record audio from a speaker, which is totally possible, is to have also purposely built an input stage also attached to the speaker. Which at that point you might as well just use a microphone...

Audio input and output are not reversible.

[Y_Y]

I don't know what you mean here, I can plug a speaker into my mic slot and use that to record, just as plugging a mic into the speaker slot gives a (crappy) speaker.

[cdaringe]

> purposely built input stage

You moved your device to the purposely built input stage.

Not an expert, but your remark doesn’t compute with the parent comment

[Workaccount2]

Because on your computer the engineers purposely put a switch that can direct the signal to either the input hardware or the output hardware.

It's not a mic slot, it's a general analog I/O port with a 3.5mm form factor.

[15155]

A DAC and amplifier circuit is electrically incapable of processing input (on its own.)

Physically unplugging and moving a speaker to a mic input works, sure, but very few devices can do this switching electronically.

[tosti]

I think most intel HDA compatible chips can do this. You can specify which pins are connected to what.

[stragies]

on many cards they are, check out the tool `hdajackretask` from package `alsa-gui-tools`.