Hello.
Please, how to create in Audacity some speaker effect? I don’t think on combo distortion, as You for example play distortion guitar. I think on effects for example, when You speak to microphone, or listen music from speaker. I don’t know, if You understand me.
But, I don’t know, how to do that?
Thank You.
Marco
You want it to sound like an overdriven guitar amp? The Distortion effect has several [u]clipping[/u] and overdrive options. You can also the Graphic EQ effect to reduce the high & low frequencies.
And there are lots of 3rd-parts guitar amp “sims” (simulators) that people use when recording guitars direct (without an amp or microphone). Most sims are designed to sound like a particular guitar amp and some developers have a license to use the names of Fender or Marshall, etc., and in those cases I assume the real amp manufacturer has approved the software plug-in.
The microphone and the speaker each have their own characteristics which can be captured by Impulse responses: IRs.
There is a VST3 plugin from AudioThing called “speakers” which can combine the IRs of various microphones and speakers in combination … https://www.audiothing.net/effects/speakers/
The free demo version of AudioThing’s “Speakers” inserts silence every ~30 seconds, (that may be long enough for some jobs).
There are free plugins which will apply an IR to the audio track, but you have to find/create the IRs of the transducers/locations.
A free source of unusual IRs is … https://fokkie.home.xs4all.nl/IR.htm
(old telephone handsets, jars, buckets, churches, abandoned factory buildings)
You’ll need an IR loader plugin to apply Impulse Responses to audio.
If I have understood good lastly, impulse and response. So It is something, like convolution.
I don’t know, if new Ladspa plugins works well in Windows version of Audacity. I remembered, that there is something, like this.
Also, I don’t want distortion effect. I would like to create recording, when somebody listen for example music from the speaker, or somebody speaks into microphone. For example somebody has a concert and singer sings to theyr microphone or something, like this.
lso, I don’t want distortion effect. I would like to create recording, when somebody listen for example music from the speaker
Sorry, that’s confusing… If you are not listening live you are ALWAYS listening through a speaker (or headphones, etc.). 
A high fidelity speaker is supposed to accurately reproduce the sound without any character of it’s own. (Guitar speakers are not supposed to be high fidelity.)
Similarly, a microphone & PA system should ideally amplify the voice (or instrument) accurately, just making it louder. A music recording is supposed to sound like the real thing… Well… not modern rock/pop/rap recordings. They are “studio creations”.
Try the Graphic EQ effect. Maybe that’s what you’re after. Try cutting the frequencies below 500Hz by -6dB, and maybe the high frequencies above 3kHz. That can give an “old-time telephone” or “old-time radio” effect. If 6dB is not enough you can run it again with the same settings to knock the lows & highs down by another 6dB, and of course you can play with different frequency bands.
A modern cell phone doesn’t seem to cut the highs noticeably but there is obviously no bass. (I’m talking about the tiny built-in speaker… The headphone output is full range and high fidelity.)
Note that cutting the highs will reduce the “T” &“S” sounds which can affect speech intelligibility, if that’s important. So you might not want to over-do it on the high end.
And with EQ it’s generally better to cut than boost ,because boosting digitally can push the levels into digital clipping (distortion).
There’s a free 32-bit VST2 plugin called “Devicer” which has a “Club PA” setting, (#16).
It does sound like a large concert venue , (but it does not include microphone emulation: so too clean IMO)
There’s Steve’s “Public Address” plugin, but that’s low-budget venue, like a small-club, (maybe too dirty) …
Thank You for Your answers.
So, when I have analised those things, It is mainly based on some echoes, reverbs, or delays. So maybe I can use normal effects from Audacity, but those effects are also good.