How accurate is Klippel?

[Marin]

The resonance you have circled is about 22 dB lower than the main output of 112 dB at 50 Hz which is not particularly bad.

Thank you my friend on kind words, and time to measure that.
Yes you are right that these are just port resonances, and the ports are located at the back thank God...
And you are right about everything but when I measure near field of middle and woofer driver and since mine have flat dust cap,I can get close as far as 5 milimetars so no stuff between sound and mic that can cause ripples, just next woofer-middle bleeding like MAB sad....
I can't find about right gating for near field measurements, thanks for mentioning @Ageve I text him private message he will surely know.

 

[Marin]

VituixCAD has a good primer on making near- and far-field driver measurements with REW

The measurement trace you circled looks like a port. If so, no surprise it is resonating since many ports make out of band noises. If not maybe you are getting drivers bleeding. Close mic distances about 5 cm may help. Disconnecting other drivers while measuring one single unit is also useful. Bi-wire posts can be used to isolate drivers, in fact it's one of the few valid uses for bi-wire posts!

Thanks bro for article, yes driver bleeding is what I am trying to get rid off...
No bi-wire thanks Good,because I would very easily fall into that trap)
I am so glad this page exist because snake oil is sold to Audiophiles by the gallons

 

[MAB]

Thanks bro for article, yes driver bleeding is what I am trying to get rid off...
No bi-wire thanks Good,because I would very easily fall into that trap)
I am so glad this page exist because snake oil is sold to Audiophiles by the gallons

The port resonance you circled is not unusual. Here are the resonances of the two ports on a recently reviewed speaker.

The woofer output and the ports add, the magnitude of the port relative to the woofer is ~20log*(port diameter/woofer diameter).

 

[a4eaudio]

I can't find about right gating for near field measurements,

Set the window anywhere from 200 to 999ms.

For midrange bleed, lightly hold some speaker damping material, a small pillow, or piece of cardboard over the midrange.

 

[Ageve]

I can't find about right gating for near field measurements, thanks for mentioning @Ageve I text him private message he will surely know.

You don’t need to use gating for near-field measurements (you can use the default setting in REW. I think it’s 500ms).

Gating is used when measuring in far-field, to capture the quasi-anechoic response (limiting the time window to avoid capturing reflections).

If you want to get an accurate nearfield bass measurement, you need to measure very close to the woofer (usually 5-10mm depending on size), and flush with the port. You then combine the two and correct the response for baffle edge diffraction before merging it with the gated far-field measurement.

 

[PB63]

My intention wasn't for anyone to accept that as the answer, but rather if you (or anyone else) were interested enough in knowing the answer, to search the internet and find it.
I have used it and know the answer for my own ears. Also, if you are interested, just do the test yourself with a Wiim or other EQ.

And now try to detect 0.25db variation with music;o) I dare to say 1db is difficult, especially when not aware of it...

 

[a4eaudio]

And now try to detect 0.25db variation with music;o) I dare to say 1db is difficult, especially when not aware of it...

I think it also depends quite a bit on the context. I've been A/B testing whether to change a resistor on the midrange and/or tweeter on a current build. The change is 0.50 dB or less over 2 to 4 octaves. Of course I'm quite focused on the change, but it's an audible difference using real music.

 

[PB63]

I think it also depends quite a bit on the context. I've been A/B testing whether to change a resistor on the midrange and/or tweeter on a current build. The change is 0.50 dB or less over 2 to 4 octaves. Of course I'm quite focused on the change, but it's an audible difference using real music.

Hmm, it seems you are more interested in tinkering, which is fine! I'm more concerned about the recordings...

 

[a4eaudio]

Hmm, it seems you are more interested in tinkering, which is fine! I'm more concerned about the recordings...

Not really tinkering, just basic crossover design for a passive speaker. But that was my point about "context", if somebody is just sitting in their room listening to music, then 0.5 dB wouldn't be blatantly obvious.