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Audiophile cables, an interesting question. - Page 66

post #976 of 1025
Quote:
Originally Posted by stv014 View Post

More likely, it could be due to the way full size headphone enclosures (especially closed ones) tend to interact with the acoustics of the outer ear. Perhaps the fact that the ears are covered affects the ear canal resonance, which is normally a large peak centered at ~3 kHz.

Agreed.

se
post #977 of 1025

It might be how my super tweeters work. I have a dip and rise in the 2kHz to 8kHz range in my response curve that looks an awful lot like a Fletcher Munson curve.

post #978 of 1025
Quote:
Originally Posted by bigshot View Post

It might be how my super tweeters work. I have a dip and rise in the 2kHz to 8kHz range in my response curve that looks an awful lot like a Fletcher Munson curve.

I'm sure it's just poor crossover design.

se
post #979 of 1025

The level of the tweeter is adjustable on the back of the monitor. Might be that.

post #980 of 1025
Quote:
Originally Posted by bigshot View Post

The level of the tweeter is adjustable on the back of the monitor. Might be that.

Might be. But I'm sure none of it has anything to do with Fletcher-Munson.

se
post #981 of 1025

Actually, I've always been a bit curious about some older speakers that have like pictures of what appears to be fr curves on them and a knob for you to switch between each curve. Sometimes just knobs for what appears to be a tone control of sorts. You know, like old JBL's and such. Is this anything related to the equal-loudness or fletcher-muson curve?

post #982 of 1025

The knobs on the back are volume pots for the midrange and tweeter. They get you in the ballpark for EQing.

post #983 of 1025
Quote:
Originally Posted by bigshot View Post
Quote:
Originally Posted by SilverEars View Post

Why do most headphones take a dip at 3k?

Fletcher Munson.

Shouldn't it be boosted at that region since we are less sensitive to it according to the curve? And, the heavy treble region seems to rise and that rise.  The headphones should reverse the curve at average listening loudness level.  Looks like 3k with a band around the region should be boosted to compensate for our sensitivity.

post #984 of 1025

Is it a coincidence that Knowles acoustic dampers for iems reflect the fletcher-munson curve?

 

damp.jpg

post #985 of 1025

edit - nevermind.


Edited by liamstrain - 7/20/14 at 8:33pm
post #986 of 1025
Quote:
Originally Posted by SilverEars View Post
 

Shouldn't it be boosted at that region since we are less sensitive to it according to the curve? And, the heavy treble region seems to rise and that rise.  The headphones should reverse the curve at average listening loudness level.  Looks like 3k with a band around the region should be boosted to compensate for our sensitivity.


Wouldn't the dips around 3kHz have something to do with dealing with the natural resonances of the headphone cups? Naturally, if there are resonances at that frequency when the headphones are in place, then you would want to reduce the energy at those frequencies.

 

At 3kHz and assuming speed of sound is 330 m/s, the wavelength is 11 cm. That puts the 1/2 wavelength at 5.5 cm and the 1/4 wavelength at 2.75 cm (which would correspond to the first harmonics in open and closed headphones, respectively) 

 

Those numbers sound like reasonable back of earcup-to-face lengths for circumaural headphones, don't they?

 

Here's a little java applet that illustrates acoustic resonance in various 1-D chambers of different boundary conditions. Unfortunately, it doesn't let one enter lengths less than 10 cm; however, by mathematical extension, you can see how the stated lengths above are accurate.

 

Cheers


Edited by ab initio - 7/20/14 at 11:16pm
post #987 of 1025
I found this, now to look for a headphone that look like this.  :D  Is there a better one than this?  This one is kinda crappy.
 

 


Edited by SilverEars - 7/20/14 at 11:47pm
post #988 of 1025

Look at the 009, uncompensated in grey.  Ok, now I see why bigshot mentioned Oppo.

 


Edited by SilverEars - 7/20/14 at 11:49pm
post #989 of 1025
Quote:
Originally Posted by SilverEars View Post
 


I don't think that inverse Fletcher-Munson curve would sound right.... That would make the frequencies we are already extra sensitve to overly exaggerated. At the same time, it would deemphasize the frequencies we can't hear well.

 

Even your 009 curve takes a dip at 2--3 kHz relative to the surrounding frequencies. Also, the low end is much much flatter than any of those inverse curves.

 

Cheers

post #990 of 1025
Quote:
Originally Posted by SilverEars View Post
 
Quote:
Originally Posted by bigshot View Post
Quote:
Originally Posted by SilverEars View Post

Why do most headphones take a dip at 3k?

Fletcher Munson.

Shouldn't it be boosted at that region since we are less sensitive to it according to the curve? And, the heavy treble region seems to rise and that rise.  The headphones should reverse the curve at average listening loudness level.  Looks like 3k with a band around the region should be boosted to compensate for our sensitivity.


that graph is showing 3khz as the frequency we hear the loudest, so it certainly isn't the reason why 3khz is boosted on headphones.

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