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Author Topic: Koss DJ100 Frequency Response and CSD Waterfall Plot Measurements  (Read 3877 times)

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Marvey

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Koss DJ100 Frequency Response and CSD Waterfall Plot Measurements
From old data. Only one channel. Posting for completeness.
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Hands

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Re: Koss DJ100 Frequency Response and CSD Waterfall Plot Measurements
« Reply #1 on: July 21, 2012, 03:20:29 AM »

I noticed this looks different than the CSD on the original HF thread for this headphone. Why is that? Changes to the measurement system over time? Better pair or seal?
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Marvey

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Re: Koss DJ100 Frequency Response and CSD Waterfall Plot Measurements
« Reply #2 on: July 21, 2012, 04:00:34 PM »

The DJ100 was one of the first I measured. The code behind the CSDs was actually buggy for the first few measurements. Under certain conditions, some headphones would look worse than they really were. These are are the revised plots - better but still not good.
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Hands

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Re: Koss DJ100 Frequency Response and CSD Waterfall Plot Measurements
« Reply #3 on: September 22, 2012, 06:39:01 AM »

I just got a pair of these for shits and giggles. The FR looked decent enough that I figured mods might help alleviate the issues. Definitely going to have to change out the pads. These are terrible. They're like pseudo on-ear/over-ear pads that are VERY picky about positioning and rarely get a good seal. They sound noticeably better when I apply a bit of pressure on the cups and get a good seal going, but I obviously can't listen like that all the time.

Other than getting different pads, I'll probably just try pretty standard mods (cup damping, foam in front of driver to tame treble, etc.). I've poked around with them a bit already. Treble certainly gets on my nerves at volumes I prefer to listen to, but I think it will be manageable in the end.
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Re: Koss DJ100 Frequency Response and CSD Waterfall Plot Measurements
« Reply #4 on: September 27, 2012, 05:04:18 AM »

For all of the people that care (I'm assuming no one), I did some basic mods on these (cup damping). Been experimenting with different pads, and the best match so far is...the pads that came with those Monoprice 8323 headphones. The real problem has been tuning down the treble. So far I have...4 layers of various felts and foams in front of the drivers, and it's finally at a level that's acceptable for me! Lol...I should find better headphones to work with.
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Re: Koss DJ100 Frequency Response and CSD Waterfall Plot Measurements
« Reply #5 on: September 29, 2012, 03:38:38 PM »

Reporting in again to all the people that don't care.

I've gotten the tonality on these to sound much more like my Paradox. I'm not very good at pointing out the differences in details, but it sounds like the modded DJ100 has more mid-bass and an overall rougher, less even response, especially in the treble. If you do sine sweeps, you can hear some pretty obvious roughness in the treble (small peaks, dips here and there). It's still manageable, though. Still, they sound more similar than not to my ears. My ears adjust to the differences very quickly.
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Marvey

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Re: Koss DJ100 Frequency Response and CSD Waterfall Plot Measurements
« Reply #6 on: September 29, 2012, 08:54:21 PM »

GJ. I can believe it. The DJ100 is always be rougher sounding though. Can't fix that. The T50RP driver has the advantage of a a smooth, but wonky FR to begin with.
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Re: Koss DJ100 Frequency Response and CSD Waterfall Plot Measurements
« Reply #7 on: January 17, 2013, 02:23:17 AM »

I don't understand why every graph i've seen of the Dj100 seems to show them with upper mids that have fallen off a cliff. The one here is sort of similar to the one on Headroom's website and on Inner Fidelity.

I can't even hear that major dip at 5k. To me they actually seem to have slightly forward upper mids and I've always felt this. It's never coming from my amp or DAC. I'll say that with my Magni or Headroom Micro to ODAC they sound more balanced that with anything else.

I've noticed Koss now drills the holes in the cup straight down to the metal. I wonder why? Previously it was just into plastic. The Tony Bennett version I got for $50 has the holes drilled straight down. My last pair didn't.

I'm also one of those nuts that finds them more revealing than my HD-650, KRKs and Q701  :-00

Sound pretty good from the Magni+ODAC. Somehow I can't get into them without a nice amp/dac.

Someday i'd love to see if they measure different with M50 pads. Right now i'm using stock and somehow they've gotten comfortable.

For me, they're good for any of my poor recordings that are harsh or too bright. It's not like an HD-650, but they sort of take the edge off some of the crap I have. The mids don't sound any more forward than that of the HD-598 though, just the upper mids.

One of the headphones that measures fairly poorly that I love. Think I listen to it every day..
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Marvey

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Re: Koss DJ100 Frequency Response and CSD Waterfall Plot Measurements
« Reply #8 on: January 17, 2013, 03:01:08 AM »

I can't even hear that major dip at 5k. To me they actually seem to have slightly forward upper mids and I've always felt this. It's never coming from my amp or DAC. I'll say that with my Magni or Headroom Micro to ODAC they sound more balanced that with anything else.

The major dip at 5k is really a severe and sharp peak in disguise. (Sharp dips in FR graphs are almost always peaks.) This is where CSDs come in handy - to confirm FR dips as peaks.

This 5k peak is exacerbated by peaks at 10kHz and 15kHz for the triple penetrator combo.
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