Great to see you happy with the outcome!!Hi, like the title says, Oratory measured my K702 I sent him, I've got two pairs and I sent him my old pair from year 2015 (made in China, not Austria). Yes, so Oratory published the result today:
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I've tried his EQ & I do like it, previously I was using my own EQ from a measurement by Crinacle.....he uses a GRAS measuring device too, so both Crinacle & Oratory measurements are compatible with the Headphone Harman Curve that we know & love (some hate though!)
Oratory measured my headphone both with the old very worn pads from year 2015 vs new pads which he put on for me, and here's the result of worn vs fresh pads:
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Oratory advised me to ignore the increased bass roll off of the worn pads, as he said he "only did the quick measurement type, which doesn't give as accurate measurement results below ~50 Hz", so he said to assume for the worn pad bass frequency response it should just track the same shape as the fresh pads in the sub 50Hz, rather than paying any attention in the graph that the bass decrease accelerates faster than the fresh pads...so you should assume that those two lines won't cross over each other in the bass. Yes, so that's not bad, that's quite easy to correct the frequency response for old pads.
Oratory also did some distortion measurements of my K702 at different input voltages, with the maximum level being the equivalent of 104dB, and here's the results, (I have asked if he'd send me through graphs showing measurements at individual levels as the following graph is a bit congested to read, so I might update the graph if he sends me through what I've asked for):
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So we can see that distortion in the bass is not bad, not an issue. There are a couple of distortion peaks at 1250Hz & 2000Hz, which seem to vary significantly depending on playback volume.
Oratory also measured Channel Matching of my headphone:
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We can see that channel matching is not perfect here! Oratory did say that our hearing sensitivity in the bass area is quite low so the increasingly large difference in the bass as you go down into the subbass is not as bad as it looks. When I get my headphone back I'll be doing Channel Matching EQ on them so I'll be able to flip channel matching on & off whilst listening to Oratory's EQ, thereby I'll see if I can recognise any benefit of channel matching.
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Excess Group Delay:
Not sure on significance of difference to above graph.
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EDIT: Oratory did say he'd have a go at finetuning the EQ some more, so it's possible that the EQ will be updated in the near future, so I'll edit this post if anything changes. I may also add my own personal tweak(s) I've added to Oratory's EQ. I'll also probably be editing this post to further to put the distortion measurements into better perspective re the dB values rather than the input voltage, and that graph may be updated with seperate graphs done for each level so it's more readable. I'll also try to see how those distortion measurements equate to Amir's standards that he sets, for instance the graph where he draws the +40dB threshold line on his 94dB distortion graph, or this may come to light in the discussions in this thread. I'll also update this post as more is learned through people's comments & analysis in this thread, and I may include a K702 EQ I've done from Crinacle's measurement too, so this may become a K702 EQ thread as well as initially displaying Oratory's measurements which he did just this week.
Finally, I'd like to say thanks very much to Oratory for measuring my headphones & the great work/contributions he makes to the headphone community....nice one Oratory, you're much appreciated!
@samwell7 , @Ravix , @bobbooo , @jhaider , @thewas , @Nango , @Seta Seta Pop , @Jimbob54 , @Bob-23 , tagging you all as you either have the K702 or expressed interested in Oratory's measurement & EQ of them.