Measurements make no sense

[Defo]

I'll get straight to the point, since I'm quite puzzled by this.
Below are measurements of my left and right Volt-10 speakers.
One is near-field of the left speaker as pictured, and the other is the right speaker without moving the microphone.

And they both measure almost the same... What in the world is going on here?

 

[rayma]

One is near-field of the left speaker as pictured, and the other is the right speaker
without moving the microphone.

The mic is in the left speaker, but only the right speaker is being driven?
Must be an error in the test equipment, like displaying the wrong trace.
Try covering the right speaker with a rug etc. and see if it changes.

 

[Defo]

The mic is in the left speaker, but only the right speaker is being driven?

Yup.

Must be an error in the test equipment, like displaying the wrong trace.
Try covering the right speaker with a rug etc. and see if it changes.

Just to make be absolutely sure, I disconnected the right speaker when measuring the left, and vice versa.

Bigger deviation this time, but the mic was also about 1 centimeter further away from the dust cap compared to the first measurements.
Still makes absolutely no sense

 

[davidsrsb]

Does the same thing happen in reverse if you move the microphone to the R/H speaker?
Down at 100 Hz the drivers are less than a wavelength apart and close to the wall, so not free space

 

[Defo]

Does the same thing happen in reverse if you move the microphone to the R/H speaker?
Down at 100 Hz the drivers are less than a wavelength apart and close to the wall, so not free space

Here are the results with the mic near-field the right speaker.
Blue is the right speaker, and orange is the left...

Note that the speakers sound fine. It's just the measurements that are totally wack.

 

[LightBit]

This is because of room. Right speaker is probably closer to corner and gets more reinforcement from walls.

 

[Defo]

The high frequency response of the other speaker should literally be non-existent. Yet, It's more or less the same, even a bit louder. So it makes absolutely no sense...

 

[mbrennwa]

Move the microphone to the other speaker, and also somewhere in the middle of the two speakers. Then see what happens.

Also, is this a gated measurement? How did you set the gate? Can you show the impulse response? Maybe you're missing the main impulse and you're just picking up the room echoes, which might be similar for both speakers.

 

[Juhazi]

Are you sure that REW gets right signal/mic, not the one of the laptop?

 

[Conrad Hoffman]

Is there a tweeter in this setup? Is the box divided between the speakers? The HF response is 20+ dB down so I wouldn't put too much stock in the numbers; could be reflections or box coupling. The LF match is a bit surprising given the mic placement, but OTOH it was pointed out that the drivers are quite close together.

 

[Defo]

Are you sure that REW gets right signal/mic, not the one of the laptop?

That's it! REW says it's using the external mic, but in reality it's not...

 

[Juhazi]

That's it! REW says it's using the external mic, but in reality it's not...

Ha - been there, done that myself!