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Author Topic: Koss KSC-35 Frequency Response and CSD Waterfall Plot Measurements  (Read 11977 times)

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Marvey

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Koss KSC-35 Frequency Response and CSD Waterfall Plot Measurements


These sound like refined KSC-75s. Still bright. Got a "detail" thing going on. Very smooth though. They remind me of Magnums. Lots of mid-bass, helps balance the treble.

CSDs ridges are cleaner than the KSC-75.
« Last Edit: July 10, 2012, 01:40:37 AM by purrin »
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Marvey

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Koss KSC-35 Harmonic Distortion Measurements
« Reply #1 on: July 10, 2012, 01:33:23 AM »

Koss KSC-35 Harmonic Distortion Measurements
  • Heehee. High bass distortion. What did ya expect for such a tiny driver?
  • Past the bass, very low overall 2nd order (and hence THD). Once of the advantages of close distance to the ear. Driver doesn't need to work as hard.
As usual, measurements taken with headphone calibrated to 90db SPL A-weighted from an Objective 2 amp.
« Last Edit: July 10, 2012, 05:01:18 AM by purrin »
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Marvey

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Re: Koss KSC-35 Frequency Response and CSD Waterfall Plot Measurements
« Reply #2 on: July 10, 2012, 01:33:33 AM »

reserved
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RexAeterna

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Re: Koss KSC-35 Frequency Response and CSD Waterfall Plot Measurements
« Reply #3 on: July 10, 2012, 01:48:06 AM »

alright, go koss! it's also pretty cool how from 5k and up the fr and csd shape matches up so perfectly.
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Re: Koss KSC-35 Frequency Response and CSD Waterfall Plot Measurements
« Reply #4 on: July 10, 2012, 05:01:24 AM »

Wow. That's a lot cleaner than I expected. I didn't think there'd be much of a difference.
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Marvey

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Koss KSC-35 vs. KSC-75 Harmonic Distortion Measurements
« Reply #5 on: July 10, 2012, 05:02:27 AM »

Similar FR, but the 35s sound really clean and refined. Gonna take distortion measurements for KSC-75 next to compare. Note that I just posted HD measurements for these up above:  http://www.changstar.com/index.php/topic,393.msg6522.html#msg6522

Compare to KSC75s which have more distortion: http://www.changstar.com/index.php/topic,231.msg2732.html#msg2732
« Last Edit: July 10, 2012, 06:14:26 AM by purrin »
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stratocaster

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Re: Koss KSC-35 Frequency Response and CSD Waterfall Plot Measurements
« Reply #6 on: July 10, 2012, 11:03:51 AM »

Any chance you check StratoKOSSter distortion?
« Last Edit: July 11, 2012, 07:54:52 PM by purrin »
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jerg

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Re: Koss KSC-35 Frequency Response and CSD Waterfall Plot Measurements
« Reply #7 on: July 11, 2012, 07:16:58 PM »

Without the 5k peak / ringing (or even just with less of it) these would be close to perfect. Of course the bass is never optimal with small drivers like this but this midrange at least on charts seems to be the best of the best.
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Marvey

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StratoKOSSter harmonic distortion
« Reply #8 on: July 11, 2012, 07:55:36 PM »

Any chance you check StratoKOSSter distortion?

Don't know what's causing that spike. It could be because of the loose mounting of the drivers.

Compared to the stock KSC-75, 2nd order seems to be a tad higher, and 3-5th order seem to be a little lower.
« Last Edit: July 11, 2012, 07:58:01 PM by purrin »
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stratocaster

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Re: Koss KSC-35 Frequency Response and CSD Waterfall Plot Measurements
« Reply #9 on: July 12, 2012, 06:28:36 AM »

Marv, thanks for providing HD distortion measurements for the Stratos. As for the spikes, IMHO it might not be the fact that the drivers are mounted loosely, but resulting from the drivers residing in a closed shell and thus the problem might be backwave related.
The spikes correlate to the dip in the FR around 4K. There is this dip between 3.5 and 4.5 KHz with both stock 35 and 75 drivers. The dip in the Stratos is just more pronounced, but it is still the same dip. My guess is that the spikes might be caused by reflections in the cup hitting the plastic driver back.
So, what I did was to cut out a ring of thin felt I used to dampen my Yamahas and cover the driver back with it, thus resting between driver back and foam damping. To my ears, running the Stratos through SineGen, the improvement is noticeable.
Seeing that you must have loads of time to try out mods, with absolutely no measurements taking your time at the moment, you would certainly not find the time to try this out on your Stratos? On the other hand, I am sure you might earn yourself half a Karma point by doing so!
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