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Headphone CSD waterfall plots

Oct 20, 2011 at 12:15 PM Post #436 of 937
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.
 
 
 
 
 
 
 
Oct 20, 2011 at 12:31 PM Post #437 of 937
purrin said:
 
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.
 
Click to expand...


Ah yes, I see. Do you have any idea what it is in the different headphones that makes this happen?
 
Oct 20, 2011 at 4:16 PM Post #438 of 937
Hmm, now I want to see what happens if you tape over the six diffusers/radiators.
 
Oct 20, 2011 at 7:15 PM Post #439 of 937
 
Quote:
rroseperry said:
Ah yes, I see. Do you have any idea what it is in the different headphones that makes this happen?
Click to expand...


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.
 
 
Oct 22, 2011 at 10:29 AM Post #441 of 937


Quote:
purrin said:
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.
Click to expand...


Sounds like a piece of cake ;). Good luck with all this Marv, I am giving it a shot...
 
 
Oct 23, 2011 at 11:11 PM Post #442 of 937
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.
 
Oct 25, 2011 at 4:13 AM Post #443 of 937
Doesn't measuring headphones under a waterfall cause problems.....? 
 
wink.gif

 
Oct 27, 2011 at 8:46 PM Post #444 of 937

SR225 CSD waterfall plots

By request.
 
SR225 with grill removed from cups and inside lined with foam

 
Compared with others:
 

SR80i


 

HF2


 

RS1


 
 
Drivers "liberated" from inner shell:
 

SR80 liberated


 

SR225 liberated

 
 
 
Nov 2, 2011 at 11:04 PM Post #447 of 937

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.
 
 
It's surprising how well matched (L and R drivers) the AKG stuff is.
 
Nov 2, 2011 at 11:19 PM Post #448 of 937
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. 
 
Nov 2, 2011 at 11:28 PM Post #449 of 937
 
Quote:
rhythmdevils said:
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. 
Click to expand...


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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