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Author Topic: Koss KSC75 Frequency Response and CSD Waterfall Plots  (Read 22701 times)

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M3NTAL

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Re: Koss KSC75 Frequency Response and CSD Waterfall Plots
« Reply #70 on: July 01, 2014, 05:39:39 AM »
Lets see some photographs of C* member interpretations of the "Kramer Mod". It has been a while since I have modified KSC75 grills.
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Solderdude

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Re: Koss KSC75 Frequency Response and CSD Waterfall Plots
« Reply #71 on: July 01, 2014, 10:20:37 AM »


below: stock KSC75, Kramer modded which means the holes as above + thicker pads.
Without thicker pads  you get relatively more treble.



The coin mod (cutting out the middle part of the foam) will also increase the treble.
Not because the foam blocks the higher frequencies (which it doesn't it is acoustically transparent) but because the pads compress somewhat more and this moves the driver closer to the ear.
« Last Edit: June 21, 2015, 06:35:37 AM by Solderdude »
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Deep Funk

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Re: Koss KSC75 Frequency Response and CSD Waterfall Plots
« Reply #72 on: July 01, 2014, 01:50:52 PM »
The second pair arrived. In my impatience I already cut open the ear cushions of my first set.

A 1 inch circular hole in the ear cushion is the best solution for me. The hole makes the KSC75 have more bass impact, more midrange and more overall detail. My KSC is slightly bright but at lower volumes it beats the Philips and DT250-250 for me.

If I had a shed and the tools I would have done the Kramer modification already.

Thanks for the recommendations, information and measurements.  p:3 KSC75
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Mullet

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Re: Koss KSC75 Frequency Response and CSD Waterfall Plots
« Reply #73 on: December 12, 2014, 04:58:27 AM »
I love the KSC75s. I use mine in the gym. I used to wear in-ears at the gym and ruined a few pairs by getting sweat in 'em. This pair I've been rockin' for about 3 or 4 years and they're still going strong. I could give a rats ass if they make me look like a d00fus while working out.  :)p3
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speakerphone

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Re: Koss KSC75 Frequency Response and CSD Waterfall Plots
« Reply #74 on: June 21, 2015, 06:12:59 AM »


Raw




Diffuse Field Target Compensated




Olive-Welti Target compensated




CSD - R




CSD - L




Harmonic Distortions - L




Harmonic Distortions - R




Impedance Magnitude


Here is Koss KSC75 measurement data from my rig, my apparatus is:
Occluded Ear Simulator: complying with IEC 60318-4 (former IEC 60711), Pinna Simulator(Small ear 35 shore-OO) complying with IEC 60268-7 annex A, and dimensionally complying with IEC 60318-7 (former IEC 60959)

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Solderdude

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Re: Koss KSC75 Frequency Response and CSD Waterfall Plots
« Reply #75 on: June 21, 2015, 07:11:51 AM »
Nice set of measurements ! :)p1
The diffuse field looks about 'right' to me.
The OW does not seem to jive with what I am hearing, in this case.
It suggests a bass-less (steep drop off below 100Hz) headphone with piercing (+10dB) treble.
To me they sound very mildly U shaped and only lack some sub-bass (and upper treble) extension.

Can you post your sonic impressions as well (how they sound too you ?).
CS is all about linking measurements with what we hear, not just plots.





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speakerphone

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Re: Koss KSC75 Frequency Response and CSD Waterfall Plots
« Reply #76 on: June 21, 2015, 07:25:11 AM »
Quote from: Solderdude on June 21, 2015, 07:11:51 AM

Can you post your sonic impressions as well (how they sound too you ?).
CS is all about linking measurements with what we hear, not just plots.


Ah, I see. I heard this that it is lack of frequency extention above 12~3kHz. And low-mid bass is boosted little bit, and vocal is pretty good with this headphone.
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playboiiz

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Re: Koss KSC75 Frequency Response and CSD Waterfall Plots
« Reply #77 on: August 17, 2015, 08:29:50 AM »
Does this headphone scale with better amp/dac?
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Solderdude

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Re: Koss KSC75 Frequency Response and CSD Waterfall Plots
« Reply #78 on: August 17, 2015, 09:01:57 AM »
To me it doesn't scale (much).
Sounds about the same from a DAP as when fed through an amp.
Others may have different experiences though.

A downside for me is that it does not really play well any more at higher than 'normal' SPL.
Experienced the same with K500 etc.

Still goes loud enough for me.
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spoony

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Re: Koss KSC75 Frequency Response and CSD Waterfall Plots
« Reply #79 on: August 17, 2015, 03:41:01 PM »
Quote from: playboiiz on August 17, 2015, 08:29:50 AM
Does this headphone scale with better amp/dac?
I think it sounds a bit more dynamic and clear from my GO450 than the Clip+.
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