3 out of 4 speakers possibly damaged?

[MAB]

I'm not sure there is a problem with any of your speakers. The pink vs. blue picture may very well be due to mic position. Did you measure the two from exactly the same mic position? If not, the difference you show is likely just the measurement, not the speaker.

Also, REW's capture button is your friend, and our friend too.

It's hard to compare directly photographs of your monitor, and saves taking pictures with phone and then uploading. And some of the angles are so tilted I can't read the legends or make a comparison.

For potentially damaged speakers, I measure impedance vs. frequency. You may not have the ability to do this easily (Dayton DATS is an easy way to do that).

You can also use an multimeter to measure the DC resistance, to see if there is a burnt driver or crossover component. Not as useful as an impedance sweep, but can catch some driver and crossover fails.

But I am not sure you have a blown speaker, am hopeful it is just changing mic position, so please confirm that part.

 

[raindance]

It seems like you might be using the microphone in your laptop instead of the measurement mic. That would explain the results not changing when you move your microphone. I've made the same mistake before using REW.

 

[MAB]

It seems like you might be using the microphone in your laptop instead of the measurement mic. That would explain the results not changing when you move your microphone. I've made the same mistake before using REW.

Yeah, that would explain many things.

 

[No_hair_left]

S

I'm not sure there is a problem with any of your speakers. The pink vs. blue picture may very well be due to mic position. Did you measure the two from exactly the same mic position? If not, the difference you show is likely just the measurement, not the speaker.

Also, REW's capture button is your friend, and our friend too.
View attachment 486733
It's hard to compare directly photographs of your monitor, and saves taking pictures with phone and then uploading. And some of the angles are so tilted I can't read the legends or make a comparison.

For potentially damaged speakers, I measure impedance vs. frequency. You may not have the ability to do this easily (Dayton DATS is an easy way to do that).

You can also use an multimeter to measure the DC resistance, to see if there is a burnt driver or crossover component. Not as useful as an impedance sweep, but can catch some driver and crossover fails.

But I am not sure you have a blown speaker, am hopeful it is just changing mic position, so please confirm that part.

I took a measurement, replaced the speaker with another one and took another measurement, the mic did not move, the mount in the ceiling is fixed so the angle, positions ect would be identical, I'll take some more measurements tomorrow at a higher spl during the day and use the capture

 

[No_hair_left]

It seems like you might be using the microphone in your laptop instead of the measurement mic. That would explain the results not changing when you move your microphone. I've made the same mistake before using REW.

Im using a mic connected to my pc, no laptop.

 

[No_hair_left]

Right I did measurement at 65db, reset everything, calibrated spl levels again it makes no sense to me, if I move the good speaker to a "bad position" it measures pretty much as it if was still in the good position, if I move any of the other 3 speakers into the good speakers position they measure like they had never been moved, if I move the mic when the "bad" speakers are in the good position it only adjusts the treble at the top end, makes no sense.

For whatever reason the section from 2k until 5k does not seems to want to change on any of the speakers, why?

 

[audiofooled]

Right I did measurement at 65db, reset everything, calibrated spl levels again it makes no sense to me, if I move the good speaker to a "bad position" it measures pretty much as it if was still in the good position, if I move any of the other 3 speakers into the good speakers position they measure like they had never been moved, if I move the mic when the "bad" speakers are in the good position it only adjusts the treble at the top end, makes no sense.

For whatever reason the section from 2k until 5k does not seems to want to change on any of the speakers, why?

I wouldn't worry about it too much, having a look at the design and this review and measurements by @joentell :

 

[No_hair_left]

I wouldn't worry about it too much, having a look at the design and this review and measurements by @joentell :

I still feel like there is a problem, makes no sense how one speaker can consistently measure the same and 3-6db louder no matter where I move it yet the other 3 I cant improve no matter where they are placed, 8-10db dips that won't change other then the top end on the other 3 speakers. Distortion looks fine.

If I take a measurement of the good speaker at 63db and do one with any of the 3 other speakers in the same place at 65db now it looks much closer, for whatever reason one speaker is considerably better then the other 3, given how much I paid for these things imported it just winds me up lol

Guess the compromise for me is increasing the volume of the other 3 speakers by 2.5 db.

 

[No_hair_left]

Right I'm going at this again because not only does it bug me given how much I paid for these things and the better speaker just takes over the others even with a full range eq and I do feel like there is a fault somewhere.

So I just decided to measure with the mic right up to the tweeter and that dip is unmovable on 3 of the speakers, it is down between 1-6db at any given time and that is too much for a tolerance between speakers. If I move the mic a little on the good speaker, the fr changes a bit, if I move it on any other the others that dip just refuses to change.

What would cause the speakers to behave like that? tweeters don't seem damaged, so is it the crossover on the other 3 that is problem?

I never go above -30 on my avr so they are not over driven, there is nothing in the distortion plots to even signal a problem, no rattling or anything. The good one is how I expected it to measure given that video shows it and the downside here is I picked these because they were coaxial and the other seats suffer even worse with that dip. Even in psy measurement, its not even close, all speakers are an equal distance apart and to the mlp.

 

[raindance]

Possibilities are:

1. Poor manufacturing tolerances (I doubt it, but you never know).
2. Tweeters in 3 of the speakers are connected out of phase (looks likely to my eyes, but would be pretty weird and unlikely).
3. Incorrect component values in crossover in 3 of the speakers (unlikely).
4. It is within tolerance (+/- 3dB can be as much as 6dB between a pair).

 

[No_hair_left]

Possibilities are:

1. Poor manufacturing tolerances (I doubt it, but you never know).
2. Tweeters in 3 of the speakers are connected out of phase (looks likely to my eyes, but would be pretty weird and unlikely).
3. Incorrect component values in crossover in 3 of the speakers (unlikely).
4. It is within tolerance (+/- 3dB can be as much as 6dB between a pair).

I'll be pretty annoyed if this is classed within tolerance, seems really shoddy if it is. Probably shouldn't bother me so much given its just atmos speakers but the better speaker does seem to pull things like voices (rare anyway) over to it when they are supposed to be overhead or if all 4 or even just the front 2 are playing it's louder even when level matched, dirac art made it worse because I cant bump the other 3 up 2db to compensate it.

 

[Flaesh]

Tweeters in 3 of the speakers are connected out of phase

This can be easily verified by looking at the IR in measurements. This is where OP can start if the measurements are saved.

 

[MAB]

I'll be pretty annoyed if this is classed within tolerance, seems really shoddy if it is. Probably shouldn't bother me so much given its just atmos speakers but the better speaker does seem to pull things like voices (rare anyway) over to it when they are supposed to be overhead or if all 4 or even just the front 2 are playing it's louder even when level matched, dirac art made it worse because I cant bump the other 3 up 2db to compensate it.

Are the tweeters wired in reverse polarity on your 'bad' speakers?

 

[No_hair_left]

This can be easily verified by looking at the IR in measurements. This is where OP can start if the measurements are saved.

Here are the measurements.

 

[No_hair_left]

Are the tweeters wired in reverse polarity on your 'bad' speakers?
View attachment 526631

Looking online it says if the first impulse peak is up then then are in polarity so Ill say yes they are in polarity on this one unless I'm reading the charts wrong

*more looking online it seems to suggest the first peak to 100 but they all are down at 100 so now I'm not sure what to make of it, if they are all reversed then surely the good one would measure like the rest. Very strange.

 

[Flaesh]

I should have written step (although it is in the impulse tab), and not impulse.

 

[No_hair_left]

I should have written step (although it is in the impulse tab), and not impulse.

This? its identical for all of them.

 

[Flaesh]

its identical for all of them.

So the problem, likely, lies elsewhere.
If select % on the y-axis, are they all identical also?

 

[No_hair_left]

So the problem, likely, lies elsewhere.
If select % on the y-axis, are they all identical also?

They are all identical on that too.