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Headphone CSD waterfall plots - Page 30

post #436 of 932
10/20/11 at 9:15am

If you guys would measure the HE-6 at that upcoming meet of yours I would personally be indebted.  I can mail you a thank you note and a candy bar of your choosing.  

 

I'd like to see if all the reports of butter-smooth treble slash extremely piercing can be reconciled with the graphs.

 

 

 

 

 

 

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post #437 of 932
10/20/11 at 9:31am
Quote:
Originally Posted by purrin View Post

 

Yes, the ridges are the resonances at particular frequencies. Click on the links to the headphone waterfall plots in my profile to see a wide example of these.

 


Ah yes, I see. Do you have any idea what it is in the different headphones that makes this happen?
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post #438 of 932
10/20/11 at 1:16pm

Hmm, now I want to see what happens if you tape over the six diffusers/radiators.

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post #439 of 932
10/20/11 at 4:15pm
Thread Starter 

 

Quote:
Originally Posted by rroseperry View Post


Ah yes, I see. Do you have any idea what it is in the different headphones that makes this happen?


With my measurements - it's mostly the driver or more precisely, the diaphragm and surround material and construction that causes ringing. Voice coil and enclosure design also contribute to this effect. Speaker / headphone drivers are not too different from drums if you think about it - except that ideally they shouldn't continue to vibrate after the electrical signal stops.

 

This doesn't happen in speakers (except for those exotic full-range units, e.g. Lowther,etc) because multiple drivers and crossovers are used to make sure each driver is operating in its most linear region below where it might ring.

 

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post #440 of 932
10/20/11 at 10:59pm
^Thanks for the explanation, very interesting what factors affect the response of these phones.
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post #441 of 932
10/22/11 at 7:29am
Quote:
Originally Posted by purrin View Post
You can have the job. I'm doing too many things right now. Closing on a house, planning a meet, teaching kids how to read, firing people at work, training new people, picking up amps from Eddie Current, hacking into your bank, etc.


Sounds like a piece of cake ;). Good luck with all this Marv, I am giving it a shot...

 

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post #442 of 932
10/23/11 at 8:11pm

Hey Marv! Where are the T50 measurements? I'd like to see where this is headed. Really mad.gif I couldn't make it. Headed back for Utah at 7:00 a.m.

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post #443 of 932
10/25/11 at 1:13am

Doesn't measuring headphones under a waterfall cause problems.....? 

 

wink.gif

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post #444 of 932
10/27/11 at 5:46pm
Thread Starter 

SR225 CSD waterfall plots

By request.

 

SR225 with grill removed from cups and inside lined with foam

SR225 open cup inside lined with foam.txt.jpg

 

Compared with others:

 

SR80i

SR80i Grilled removed inside lined with foam.txt.jpg

 

HF2

HF2.txt.jpg

 

RS1

RS1 L.txt.jpg

 

 

Drivers "liberated" from inner shell:

 

SR80 liberated

SR80i Liberated Driver.txt.jpg

 

SR225 liberated

SR225 1 liberated.txt.jpg SR225 2 liberated.txt.jpg

 

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post #445 of 932
10/28/11 at 5:20pm

^^ Brilliant! Thanks for this. smile.gif

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post #446 of 932
10/30/11 at 12:08pm

.


Edited by rhythmdevils - 11/2/11 at 8:12pm
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post #447 of 932
11/2/11 at 8:04pm
Thread Starter 

AKG K270

Pre-measurement impressions:

 

Some ringing at 4-5k? This is a tough spot to hear ringing. I noted the Grados and some of the AKGs have a resonance node this area - I've since learned how to hear it. It's not a bad spot, sounds similar to the 2kHz midrange honk or shout, but at an octave higher, sort of like a hard smack. Ringing around 8kHz is much worse. These are hard to drive. I think the bass lacks the lowest two octaves, but it's plenty punchy without midbass emphasis (maybe a little bit.) They remind me of the K240EP, but just not quite as charming. There a sharp very narrow peak up in the treble that occasionally gets activated. I'm enjoying these.

 

These are not FR plots. The waterfall plots below only go down to 200Hz.

Closed headphones require bass compensation below ~2kHz which is not applied in these plots.

K270 L.txt.jpg K270 R.txt.jpg

 

It's surprising how well matched (L and R drivers) the AKG stuff is.


Edited by purrin - 11/2/11 at 8:07pm
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post #448 of 932
11/2/11 at 8:19pm

That's the Playback version just fyi, which is very rare and highly sought after by AKG fanatics- I've only seen a few of them on head-fi.  Seems like you liked them better than I did.  Some people really love them, but if I'm remembering right I found them to have quite a bit of glare or etch in the upper midrange.  That dip right at the spot of the worst ringing is strange.  I wonder if that has to do with the dual divers. 

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post #449 of 932
11/2/11 at 8:28pm
Thread Starter 

 

Quote:
Originally Posted by rhythmdevils View Post

That's the Playback version just fyi, which is very rare and highly sought after by AKG fanatics- I've only seen a few of them on head-fi.  Seems like you liked them better than I did.  Some people really love them, but if I'm remembering right I found them to have quite a bit of glare or etch in the upper midrange.  That dip right at the spot of the worst ringing is strange.  I wonder if that has to do with the dual divers. 


Some glare - but no etch. At least only occasionally activated etch. Could be my amp - it is set up to play with HD800s so that explains a lot. Just to clarify: I like the AKG270 a little bit, but not a lot. 

 

Holy crap... been listening to your modified Yamaha RH-5Ma for the last hour. Thought I had my HD800s on. Didn't even realize it.

 

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post #450 of 932
11/2/11 at 8:32pm

Haha well then your amp really is working wonders!  But I do think those little suckers have some potential. 

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