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The AKG K712 Pro Support and Impressions Thread - Page 154

post #2296 of 4666
Quote:
Originally Posted by yaluen View Post
 

Playing around with the HeadRoom graphs to get uncompensated and unsmoothed results gives this:

 

 

I moved from left to right

 

 "yup, yup, pretty much as I would expect.... wait what happened at 1-4kHz?"

post #2297 of 4666

The innerfidelity graphs are somewhat different.

 

http://www.innerfidelity.com/headphone-data-sheet-downloads

post #2298 of 4666
Quote:
Originally Posted by darrenyeats View Post
 

The innerfidelity graphs are somewhat different.

 

http://www.innerfidelity.com/headphone-data-sheet-downloads

Didn't compare it in all seriousness but indeed there are some differences. Probably the headphone angel towards the mic I guess? 

post #2299 of 4666
Quote:
Originally Posted by yaluen View Post
 

Playing around with the HeadRoom graphs to get uncompensated and unsmoothed results gives this:

 

 

May I know how to get this raw results? I cannot find the link in Headroom to get this data. I would be glad if somebody can point me to the link. Many thanks! :normal_smile :

post #2300 of 4666
Quote:
Originally Posted by TitaniteXtreme View Post

May I know how to get this raw results? I cannot find the link in Headroom to get this data. I would be glad if somebody can point me to the link. Many thanks! normal_smile%20.gif

Here you go my friend smily_headphones1.gif http://www.headphone.com/learning-center/build-a-graph.php
post #2301 of 4666
Quote:
Originally Posted by BillsonChang007 View Post


Here you go my friend smily_headphones1.gif http://www.headphone.com/learning-center/build-a-graph.php

 

He is asking about the raw FR response (no compensation, no smoothing). I am asking as well, btw :)

post #2302 of 4666
Quote:
Originally Posted by darrenyeats View Post
 

The innerfidelity graphs are somewhat different.

 

http://www.innerfidelity.com/headphone-data-sheet-downloads

 

Actually they're exactly the same. Tyll provides the graphs to Headroom and they match what is on his site in almost every case. The graphs that yaluen posted are raw FR graphs with no compensation which correspond to the grey lines on the Innerfidelity FR graphs.

post #2303 of 4666
Quote:
Originally Posted by emertxe View Post
 

 

He is asking about the raw FR response (no compensation, no smoothing). I am asking as well, btw :)

 

x3

 

Where is the option to display the raw graph?

post #2304 of 4666
Quote:
Originally Posted by TitaniteXtreme View Post
 

 

May I know how to get this raw results? I cannot find the link in Headroom to get this data. I would be glad if somebody can point me to the link. Many thanks! :normal_smile :

 

To get the different results you reduce the numbers by 1 or 2.

 

Here is the raw graph of the K712 and HD-650:

http://graphs.headphone.com/graphCompare.php?graphType=0&graphID[]=4161&graphID[]=851&scale=30

 

post #2305 of 4666
Quote:
Originally Posted by tdockweiler View Post
 

 

To get the different results you reduce the numbers by 1 or 2.

 

Here is the raw graph of the K712 and HD-650:

http://graphs.headphone.com/graphCompare.php?graphType=0&graphID[]=4161&graphID[]=851&scale=30

 

 

 

Thanks.

 

I take it your talking about these numbers:

 

"graphType=0&graphID[]=4161&graphID[]=851&scale=30"

 

So:

graphID[]= xxxx = "Frequency Response"

xxxx - 1 = "Frequency Response Compensated"

xxxx - 2 = "Frequency Response Raw"


Edited by chicolom - 11/13/13 at 9:14am
post #2306 of 4666

Yep, that is exactly it, you change the graphID numbers. However, you've made a slight mistake in your labels.

 

graphID[] = xxxx = "Frequency Response (Compensated and Smoothed)"

xxxx - 1 = "Frequency Response (Compensated but Unsmoothed)"

xxxx - 2 = "Raw Frequency Response"

 

I don't think there's a explicit link or any indication on HeadRoom that these graphs exist so you have to manually edit the URL. Also, anybody know what target curve HeadRoom uses for compensation?


Edited by yaluen - 11/13/13 at 2:27pm
post #2307 of 4666
Now I get it xD
post #2308 of 4666
Quote:
Originally Posted by yaluen View Post
 

Yep, that is exactly it, you change the graphID numbers. However, you've made a slight mistake in your labels.

 

graphID[] = xxxx = "Frequency Response (Compensated and Smoothed)"

xxxx - 1 = "Frequency Response (Compensated but Unsmoothed)"

xxxx - 2 = "Raw Frequency Response"

 

I don't think there's a explicit link or any indication on HeadRoom that these graphs exist so you have to manually edit the URL. Also, anybody know what target curve HeadRoom uses for compensation?

 

OK, thanks.

 

I just quoted exactly what was written at the top of each corresponding graph when you change the numbers.

 

Not sure about your curve question, but HeadRoom gets its graphs from Tyll at Innerfidelity, so maybe there's some info here:

http://www.innerfidelity.com/content/headphone-measurement-proceedures-frequency-response

post #2309 of 4666

Yeah, actually no mistake per se in your labels, just could use the clarification. Thanks for the link, looks like good reading. Skimming a bit, here's the relevant bit:

 

Quote:
Free Field – The HRTF when a sound is emitted from a source directly in front of the head in an anechoic environment.

Diffuse Field – The HRTF when sound is coming at the head from all directions simultaneously.

Independent of Direction – A rather recently developed HRTF to measure real world sounds in less abstract and highly conditional situations than the two cases above.

 

I would prefer to have an HRTF calibration curve for the special conditions of two speakers placed 30 degree of axis as that is what the headphones are trying to simulate, but no such calibration exists. After lengthy discussion with the applications engineers at Head Acoustics, the Independent of Direction HRTF was picked as the most applicable for my purposes.

 

And something else I found:

 

http://www.head-acoustics.de/downloads/eng/application_notes/Equalization_brochure.pdf

post #2310 of 4666
Quote:
Originally Posted by devhen View Post
 

 

Actually they're exactly the same. Tyll provides the graphs to Headroom and they match what is on his site in almost every case. The graphs that yaluen posted are raw FR graphs with no compensation which correspond to the grey lines on the Innerfidelity FR graphs.

Even if the raw graphs are the same, it's irrelevant to my point.

 

I am saying the regular FR as presented to the public is quite different. Regular (not raw) FR below:

 

On innerfidelity the Q701 20Hz response is 5db down from 100-200Hz peak.

On innerfidelity the K712 20Hz response is 3.5db down from 100-200Hz peak.

A comparative difference between headphones of 1.5 db in 20Hz roll off from 100-200Hz.

 

On headroom.com the Q701 20Hz response is 9db down from 100-200Hz peak.

On headroom.com the K712 20Hz response is 4.5db down from 100-200Hz peak.

A comparative difference between headphones of 4.5 db in 20Hz roll off from 100-200Hz.

 

If they use the same raw data then they are massaging it quite differently when presenting the regular FR to the public.


Edited by darrenyeats - 11/14/13 at 3:43am
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