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Author Topic: AKG K240 EP Frequency Response and CSD Waterfall Plots  (Read 6355 times)

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Marvey

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AKG K240 EP Frequency Response and CSD Waterfall Plots
« on: December 09, 2011, 10:55:21 PM »

AKG K240 EP Frequency Response and CSD Waterfall Plots. These are the EP Sextetts with the passive radiators.

Sounds better than it looks:
  • U-shaped curve, but lots of warmth (200-500Hz). This is huge factor.
  • Treble ringing is high up ~12kHz. We can hear the occasional sizzle, but it's not as bad as ringing from 6-9kHz.
  • Ringing at the 4-5kHz area tends to be more benign. Also, there are supporting ridges below the 4kHz ridge. This sort of muddies / blunts things compared to a sharp bladed ridge by itself.
« Last Edit: June 21, 2012, 06:45:45 AM by purrin »
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RexAeterna

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Re: AKG K240 EP Frequency Response and CSD Waterfall Plots
« Reply #1 on: December 17, 2011, 11:51:01 AM »

that's interesting. wonder how the MP and LP measures compared to the EP. all i ever owned were LP models. still have original box to my current one.
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rhythmdevils

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Re: AKG K240 EP Frequency Response and CSD Waterfall Plots
« Reply #2 on: December 24, 2011, 10:01:20 PM »

I still can't believe how poorly these measure.  I think the Sextett makes a great case study to learn more about these measurements because there must be more to the picture. 
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rhythmdevils

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Re: AKG K240 EP Frequency Response and CSD Waterfall Plots
« Reply #3 on: December 24, 2011, 10:05:44 PM »

Oh, and I doubt the MP or EP would measure that differently but who knows with this strange beast.  Still, they use the same basic driver and passive radiator design which seems to be accounting for these measurements. 

I'm suspicious that the passive radiators are part of why these look so bad.  They are essentially 6 driver diaphragms that react with the backwave produced by the driver, so maybe they have a delayed response from the driver that doesn't sound that bad, but is picked up in this type of graph.  An interesting test here would be to measure a K141 of the same vintage, which uses the same driver, but without the passive radiators and with circumaural pads instead.  And yet despite these pretty drastic physical changes, sounds almost identical to the Sextett, just slightly smaller soundstage.  Too bad I don't have mine anymore. 
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RexAeterna

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Re: AKG K240 EP Frequency Response and CSD Waterfall Plots
« Reply #4 on: December 24, 2011, 11:48:49 PM »

but ain't the passive membranes made different materials from the EP,MP,LP headphones? i don't know how mp or ep sounds but going by most people mentioning lp having less bass of the 3, i assume that the passive membranes possibly made from better materials tune to keep the bass more controlled on the LP models? maybe the passive membranes will affect measurements maybe due to absorption taking place in back of the driver. i do like my lp's imaging and soundstage the most though besides my df's. even though my sextetts are smaller and semi-open compared to my fully open k601, the imaging is better on my sextetts and more binaural like and outside the head.

only way to know is get mine measured on how much difference there is. i will send mine out when i get my 240DF's and fostex back.
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RexAeterna

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Re: AKG K240 EP Frequency Response and CSD Waterfall Plots
« Reply #5 on: January 08, 2012, 02:10:24 AM »

Rhythm, i'm curious what color driver casing is your EP? i just recently took my LP apart to fully recable them finally and i noticed this LP had a red casing but had 3 bigger hole openings in the back compared to my other lp that died had a white cases but had only 1 small hole. i notice the guy who worked on these before selling them to me put some thick sticky foam inside. it was nothing like the typical thin foam you see in AKG headphones,maybe that's what contributed to the slightly warm sound....cause now they sound much more clear sounding especially in the midrange. i don't know if it cause i recabled them or cause the thick foam inside.  think mostly thick foam, but curious what drivers your EP uses?
« Last Edit: January 08, 2012, 02:20:28 AM by RexAeterna »
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rhythmdevils

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Re: AKG K240 EP Frequency Response and CSD Waterfall Plots
« Reply #6 on: January 08, 2012, 05:12:32 AM »

Not sure I can't get myself to take them apart.  Too many 30 year old crappy snap together plastic parts.  Would like to have them cleaned and recabled, but I have other priorities
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RexAeterna

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Re: AKG K240 EP Frequency Response and CSD Waterfall Plots
« Reply #7 on: January 08, 2012, 08:50:30 AM »

understand. i was like that with my first LP set. even though i got them for 15 bucks, i still felt edgy and very worried taking them apart. i heard they use different domes on the drivers too right? does it make any difference in sound? i think i'm gonna try to collect some MP and EP sets to see how different they are but, gonna wait till i get my older Sansui 5000x amp running up to spec and working again.
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rhythmdevils

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Re: AKG K240 EP Frequency Response and CSD Waterfall Plots
« Reply #8 on: October 02, 2012, 08:09:27 AM »

Did you re-do these Marv?  They look different then I remember.  Makes more sense with my subjective impresssions.  12k ringing and roll off contributes to the grainy treble. 

Do you think the 5k ringing is similar to the ortho wall ringing that doesn't seem to be audible?  Because otherwise they are pretty clean. 
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jupitreas

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Re: AKG K240 EP Frequency Response and CSD Waterfall Plots
« Reply #9 on: April 17, 2013, 10:43:34 PM »

Well, I just bought a near-mint condition MP sextett and I am seriously impressed with how insanely good it sounds. I need some more time to form a well-informed opinion, but my initial impression is "wow, these are bright but somehow still really neutral sounding".
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