Speaker measurements show 1KHz tone and harmonics

[tuga]

Hi,

This is my first post.

I've measured my speakers and the distortion tab shows a 1KHz tone and it's harmonics creeping out of the noise floor:

Whis is this happening, have I done something wrong?

Thanks,
Ricardo

 

[John Mulcahy]

Are you using a USB mic? Some USB mics show harmonics of the USB 1 kHz frame rate due to supply modulation, though not usually to that extent. If you do have a USB mic are you using a very long cable?

 

[tuga]

Hi,

Thanks for the reply.
I am indeed using a cheap USB OMNITRONIC MM-2USB mic, the cable is around 1m long.

Best,
Ricardo

P.S.: is there a reason why I can't post links, not even directing to an AVNirvana page?

 

[John Mulcahy]

You may need a few more posts before you can add links, following a spate of automated spamming a little while back.