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Help with peak +5 db at 1.4 Khz

Farenheit

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Hello,

I have a strange peak at 1.4 Khz and I would like you to think about what it is due to.

I could equalize it with room correction, but I prefer not to apply filters above Schroeder, except with low Q filters.

The room is treated, as you can see in the attached photos.

The location of the speakers may seem strange to you, but it is the one suggested by the manufacturer due to the asymmetrical horn (JBL S3100).

Thanks in advance for your cooperation.
 

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Farenheit

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Thank you very much for your quick and kind responses.

Do you recommend me to cancel this peak with DRC?
 

thewas

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The half wave lenght at 1,5K is 11cm.the ears are separated by 15 cm.
But what does that have to do with his ears, if he is not measuring the response with a binaural head?
 

abdo123

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It's probably related to distance between the speakers and a boundary, or the listener and a boundary.

the only real way to solve this is to evenly spread treatment AND pushing the speakers and listener as far as you can from the boundaries.
 
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Farenheit

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Does it bother you when listening to music, or just when looking at the measurement? :)
Just looking at the measurements...:)

... But that's why I go to the "measures forum".:rolleyes:

If my watch did not mark the time correctly, I would go to a watch forum:p
 

sigbergaudio

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If it sounds fine, I suspect your time will be better spent listening to music than spending countless hours hunting for the reason and trying to acoustically dampen it, especially since your room seems to be reasonably treated already. :)
 

Frgirard

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But what does that have to do with his ears, if he is not measuring the response with a binaural head?
You hear with two ears and a head no attached to a plot.
What happened 5 cm on a side or 10 cm?
Typically a false issue.
 

thewas

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You hear with two ears and a head no attached to a plot.
But again that does not explain that peak which shouldn't be there and can be audible. For neutral reproduction you don't want to have/measure significant peaks at the LP in that frequency region as they are either loudspeaker related or some nearby reflection which you both don't want to have.
 
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Farenheit

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But again that does not explain that peak which shouldn't be there and can be audible. For neutral reproduction you don't want to have/measure significant peaks at the LP in that frequency region as they are either loudspeaker related or some nearby reflection which you both don't want to have.
That's the thing, I couldn't explain it better.

Note: I am not fluent in English and I am using the Google translator. We Spaniards have never been good at languages, unfortunately... (and on top of that I'm from Andalusia):rolleyes:
 

thewas

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That's the thing, I couldn't explain it better.

Note: I am not fluent in English and I am using the Google translator. We Spaniards have never been good at languages, unfortunately... (and on top of that I'm from Andalusia):rolleyes:
Don't worry, your posts are more readable than of many native speakers that don't take the time or effort to syntax them decently. (I am also not a native English speaker).

About your peak, I would also do a measurement relatively close to the loudspeaker (approximately 60-100 cm) at the tweeter axis to see if it appears there too, I guess it is rather a horn related bump https://www.dlmanuals.com/manual/jbl-s3100/owner-s-manual/7#pagetopwraplink (measurement of the S2600 from that series)
 

holbob

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In my room, my speakers have around 4-7db peaks at around 700-1500hz (ish). Closing the curtains, draping a duvet over the double French doors, and another over the glass display cabinet, solves most of the peak. I have 0.75q filters at around 2.5db in both speakers. It's probably something in the room causing it.
 

Sal1950

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Thank you very much for your quick and kind responses.

Do you recommend me to cancel this peak with DRC?
Yes absolutely, why not?
 

sigbergaudio

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How does the frequency response / peak look if you measure like 50cm to either side of your main listening position?
 
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Farenheit

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Don't worry, your posts are more readable than of many native speakers that don't take the time or effort to syntax them decently. (I am also not a native English speaker).

About your peak, I would also do a measurement relatively close to the loudspeaker (approximately 60-100 cm) at the tweeter axis to see if it appears there too, I guess it is rather a horn related bump https://www.dlmanuals.com/manual/jbl-s3100/owner-s-manual/7#pagetopwraplink (measurement of the S2600 from that series)
I just measured each speaker at 50cm. as you suggested and also placing a good absorber on the wall next to the horn to avoid reflections, and the result is that the damn peak only appears on the left speaker!

Could some component of the filter be out of value? The speakers are 25 years old...

Also, I believe that in the design of the filter Greg Timbers (JBL) introduced some kind of equalization to avoid certain horn resonances.

Thank you very much for your patience and wisdom.:rolleyes:
 

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Farenheit

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Podría ser, podría ser, aunque también un conductor ya no cumple con las especificaciones. En este caso también recomendaría tomar medidas de campo cercano unos milímetros por delante de cada conductor para un mejor diagnóstico de su comportamiento.
Ok!
 
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