measurement impossible due to Larsen

[Robyboyd]

Hello,

For sometime, it's impossible to do measurement with REW because of larsen.

Did somebody already have this pb?

BR.

Arnaud.

 

[EarlK]

Your communication is mostly failing here due to using the word "larsen" instead of "feedback" .

"larsen" is just not contextually correct for most of us ( though "feedback" would be ) .

So ( a solution );
One needs to turn off signal monitoring ( to avoid signal feedback contaminating measurements ) .


Larsen ( effect )

 

[Robyboyd]

Hi Earl,

Thx for your reply. As I don’t know how to modify title I’m going to create a new post.

I’m not sure to understand when you said « turn off signal monitoring ». To me signal monitoring would be the signal comes from the soundcard to the speakers. Am I true? (If so, the signal is needed to do measurements).

B4

 

[EarlK]

Somehow, you are feeding the output signal ( electrically ) back into the input ( where it's mixing/contaminating the signal picked up by the microphone ).



PS; it's a common error made by people new to using soundcards and making measurements,

 

[Robyboyd]

Hi Earl,
I use a scarlet solo as sound card. Output goes to the preamp of my system (to generate signal for measurement), and input is the mic. What can be wrong? I did several measurement before without pb.

 

[Robyboyd]

Ok, I understand what you mean! Output is feeding input (as a loop). I have to check my souncard parameter.
Have a nice day.
Arnaud.

 

[EarlK]

Hi Earl,
I use a scarlet solo as sound card. Output goes to the preamp of my system (to generate signal for measurement), and input is the mic. What can be wrong? I did several measurement before without pb.

Make sure the "Direct Monitor" switch/or button is in the "Off" position



.

 

[Robyboyd]

Hi Earl.
Thank you for your help. (Oh f...! What a shame!)
Br.
Arnaud.