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Headphone CSD waterfall plots

Oct 20, 2011 at 12:46 AM Post #421 of 937
If they're K240's they are EP Sextetts.  The only mods are that I replaced the stock perforated plastic grill with speaker cloth.  Didn't seem to change much acoustically surprisingly but it's more comfy.  I don't hear ringing either, and since Ty'll measurements them not settling down quickly in the impulse response I was thinking it might be the bass that was causing that, which you seem to be hearing.  They're semi-open.  Basically they are closed headphones with cracks that let the sound out.  Purrin, you should check out the passive radiators inside.  Just be careful when you remove the pads because the radiators are delicate and the speaker cloth doesn't keep fingers out.  It's a nice bit of 70's engineering. 
 
Oct 20, 2011 at 12:48 AM Post #422 of 937


Quote:
purrin said:

AKG K240 Sextett? (@rdevils can you confirm?)

Pre-measurement impressions:

 
Very intimate female vocals - heh - which probably means non-linear FR. These need quite a bit of power. Extremes are rolled off. 3-4kHz peak - if any ringing not serious. Smooth sounding. I kind of like these. Bass doesn't appear to extend low like most closed cans, but it sounds more open in nature. Some treble emphasis. Are these ported or something? Bass doesn't sound aligned - like a ported speaker where the lower bass is a little slow in arriving. It's OK though. I like these! If don't want to take them off for measurements, then I must like them.
Click to expand...


The six diffusers in the Sextett from which it derives its name is meant to equalize the pressure in front of the baffle and prevent the midbass hump (at least that's how I interpret it). I'm guessing it's through these same diffusers that would perhaps provide a bit of an "echo" in the bass?
 
 
Oct 20, 2011 at 12:49 AM Post #423 of 937

AKG K240 Sextett? (@rdevils can you confirm?)

These are not FR plots. The waterfall plots below only go down to 200Hz not 20Hz!
Closed headphones require bass compensation below ~2kHz which is not applied in these plots.

 
Ouch I got this one totally wrong! I didn't think the ringing was this severe at all. I didn't hear the ringing at 12kHz and 14khz either (probably because it's hard for us to distinguish specific tones at such higher frequencies - above 10khz.) Putting the headphones back on, I think I can hear the effect, but it's not an unpleasant one. the 4kHz ringing just doesn't seem that bad. This is an odd one.
 
Oct 20, 2011 at 12:51 AM Post #424 of 937
eek.gif

 
So weird, I don't hear that stuff either.  Maybe the grain in the treble is caused by the ringing at 12/14khz?
 
Oct 20, 2011 at 1:03 AM Post #425 of 937
 
Quote:
rhythmdevils said:
Purrin, you should check out the passive radiators inside.  Just be careful when you remove the pads because the radiators are delicate and the speaker cloth doesn't keep fingers out.  It's a nice bit of 70's engineering. 
Click to expand...


Ahhh. Is that what it is? Passive radiators have a lot of group delay. Probably what I'm hearing. It's a nice bass-reflex box effect - not really noticeable unless I directly come from another open headphone.
Quote:
rhythmdevils said:
eek.gif

 
So weird, I don't hear that stuff either.  Maybe the grain in the treble is caused by the ringing at 12/14khz?
Click to expand...


AMUSING OBSERVATION: I have a hard time hearing ringing at 4-5kHz; or if I do hear it, it's inane. For example, while I do hear the typical Grado 5khz ringing, I am actually OK with it. It's the Grado 8-9kHz ringing that hurts me. Most people are sensitive in that area.
 
I hear zero grain - then again it's probably the Eddie Current Balancing Act (I've decided I'm going to be annoying and promote Craig's stuff at every opportunity because I like his stuff so much). I've got my most laid back tubes in it right now.
 
Oct 20, 2011 at 1:11 AM Post #426 of 937
For the uninitiated, would anyone care to explain what the waterfall plots of an ideal headphone/speaker should look like? Is it better for the "waterfall" to end earlier than go continue?
 
Oct 20, 2011 at 1:19 AM Post #428 of 937


Quote:
purrin said:
 
I hear zero grain - then again it's probably the Eddie Current Balancing Act (I've decided I'm going to be annoying and promote Craig's stuff at every opportunity because I like his stuff so much). I've got my most laid back tubes in it right now.
Click to expand...



Yeah whenever I take my Sextetts to meets and plug them into beastly amps like yours I don't hear the grain.  Meet conditions probably mask some of that too though. 
 
Oct 20, 2011 at 1:21 AM Post #429 of 937
I'm still listening to them right now and ignoring all the other headphones in the box. They are not the last word in resolution, a little bright, but definitely good sounding. They remind me of good 80s speakers.
 
I'll measure some crappy headphones before I get to some good ones. I've got a HP1000 driver in a PS1 shell - that one's nice.
 
Oct 20, 2011 at 1:52 AM Post #430 of 937


Quote:
rhythmdevils said:
Yeah whenever I take my Sextetts to meets and plug them into beastly amps like yours I don't hear the grain.  Meet conditions probably mask some of that too though. 
Click to expand...



Ever try them out of a Bottlehead Crack?
 
Oct 20, 2011 at 2:09 AM Post #432 of 937
Oct 20, 2011 at 5:09 AM Post #434 of 937
Oct 20, 2011 at 11:33 AM Post #435 of 937
 
Quote:
rroseperry said:
Any idea what structurally causes the ringing profile? That long ridge to the foreground?
Click to expand...


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.
 
 
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