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Author Topic: stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots  (Read 12391 times)

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Marvey

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stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots
« on: June 15, 2012, 11:10:23 AM »
ratoKOSSter (KSC-75 mod) Frequency Response and CSD Waterfall Plots



Compare with KSC75:


Pre-Measurement Listening Notes:
  • they are awesome. mids are awesome
  • bass needs for low end, and treble scratchy, but you can't do much about that - limitations of the driver.
  • good balance - nice mid-centric headphone - grado-ish eccentricities solved.
  • some reverb in the cups at high volume
  • could dampen that with stuffing material, but I don't know how that may change the FR
  • consider pillow stuffing or wool, cotton never works right, but you may need to change cup size since stuff will effectively increase internal volume
« Last Edit: June 15, 2012, 07:05:18 PM by purrin »
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stratocaster

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Re: stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots
« Reply #1 on: June 15, 2012, 02:07:53 PM »
Marv, thanks for measuring them and your advice as to how one could approach the remaining issues. In the end it is nice to see that your ears did not play tricks on you when working on the phones. I guess one could easily start telling yourself how good they sound just because you wanted them to sound good.
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LFF

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Re: stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots
« Reply #2 on: June 15, 2012, 02:31:18 PM »
Ohhh.....I want to listen to these!!! 8)
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Questhate

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Re: stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots
« Reply #3 on: June 15, 2012, 04:40:54 PM »
Wow. Nice job, Strat!

CSDs don't look offensive at all. Is that dip at 4K on the FR just a backwave?
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rhythmdevils

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Re: stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots
« Reply #4 on: June 15, 2012, 05:32:19 PM »
Nice job stratomaster.  Can I ask what your mods are, or at least just generally what you did?
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LFF

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Re: stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots
« Reply #5 on: June 15, 2012, 05:36:32 PM »
Quote from: Questhate on June 15, 2012, 04:40:54 PM
Wow. Nice job, Strat!

CSDs don't look offensive at all. Is that dip at 4K on the FR just a backwave?

That would be my guess based on the huge dip....
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SanjiWatsuki

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Re: stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots
« Reply #6 on: June 15, 2012, 06:05:37 PM »
Wow. That's a really fine response for a mod on a $15 pair of headphones.
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Marvey

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Re: stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots
« Reply #7 on: June 15, 2012, 06:14:12 PM »
FYI. 4k dip is a measurement artifact ("bogus" reflection, etc.) You can tell if the dip is legit on the CSD. If it's legit, we will see the dip propagate in time.
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stratocaster

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Re: stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots
« Reply #8 on: June 15, 2012, 06:59:15 PM »
Quote from: rhythmdevils on June 15, 2012, 05:32:19 PM
Nice job stratomaster.  Can I ask what your mods are, or at least just generally what you did?

Here is the link to the mod page: http://www.head-fi.org/t/611982/the-stratokosster-a-closed-diy-headphone-based-on-the-koss-ksc-75-driver-and-grado-cup-design#post_8415950

Pic shows the measured StratoKOSSters.
« Last Edit: June 17, 2012, 08:34:53 AM by stratocaster »
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Marvey

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Re: stratoKOSSter (KSC75 mod) Frequency Response and CSD Waterfall Plots
« Reply #9 on: June 15, 2012, 07:03:40 PM »
You did achieve very good bass extension, but at the price of overall bass volume. I like what you did better than the stock.

Do you mind if I take it apart to experiment with different internal volumes and stuffing materials? I figure it's the least I can do since you've sent it from so far away.
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