Delay Line Measure delay

[Untie]

Hello,
I am setting up a delay line for a concert. Is there a way to measure the delay for this in REW? Smaart, for example, emits a sound that can be recorded with a microphone and the program measures the duration between transmission and reception.
If not, would it be possible to implement this?

 

[John Mulcahy]

You could do that by using a loopback connection on one channel as a timing reference and making a sweep measurement through the delay line on another channel.

 

[Untie]

Thank you.
I've a question to measuring with a sweep (I tried it today with an interface (and an PA system (with Linux and Win10)) and a few minutes ago with my internal mic and desktop speakers (with Linux)). Both times I didn't hear a sweep. I used the default settings for measuring.

Do I make a mistake? REW shows an error after completing the measure:

 

[John Mulcahy]

Select the actual device you are using on the REW soundcard preferences, do not rely on the OS default.

 

[Untie]

There is only the Default In- and Output possible. I cannot choose other devices.

 

[John Mulcahy]

I can't comment on Linux audio, sorry, but I have never seen that under Win10.

 

[Untie]

The drop down menus aren't active.

 

[John Mulcahy]

Device selection is in the Soundcard preferences, choose the input and output devices there. Best choosing entries whose names start with Excl to use WASAPI Exclusive drivers.

 

[Untie]

Thank you, I tried it just at home with my desktop speakers at it worked now. I'll try tomorrow with the interface, PA System and measure micro.
In which graph do I see the delay between the inner loop back and the microphone the best?

 

[Untie]

Forget the question, I see it just now in the information about the measurement.