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**Hifiman HE-400 Impressions and Discussion Thread** - Page 1021

post #15301 of 19810
Quote:
Originally Posted by mlxx View Post
 

 

I had the same issue with driver touching the ears with it removed.. but doesn't putting the spacer back cover the holes cut out and defeat the purpose?  As yet I haven't done this mod but want to do it soon, still not convinced it will help the he400. What they should do is have spacers made of the same foam material that is inside the pads.

No - depending on how and where you cut the holes, many remain exposed and can be there to capture reflections (I assume). In my particular case, I can see some of the holes I cut, while others are partially / completed obstructed. If I could do it over, I would keep my holes as close to seam as possible. As it is, I am pretty close, but could have been a tad more aggressive. That way, no matter what, the holes would have maximum overhang into the listening area and probably capture some of the sound as it radiates to the ear.

 

With the spacers installed, looking at the cans, what you end up with is probably 1/4 to 1/2 inch 'cylinder' firing at the ear. The pleathers / ear lobes absorb/reflect some of the sound energy as it travels to the ear. No question that the pleather has some overhang - not blocking the drivers, but certainly posing an obstacle in what would otherwise be a cylinder tube strapped to you ear. Question is, by letting the drivers be closer to my ear, am I doing a better job of minimizing unwanted reflections? Second question would be, do we have an issue wherein a square planar wave front travels badly through a round hole?

 

In any event, even without the spacers, reinstalling the pads places them against the plastic retaining ring. That ring has holes in it, yes, but the whole circumference of mount ring / pad surrounds the driver and does not really expose the holes to the driver any more without the spacer ring than with it. But it does potentially add more distance between the driver and your ear, and does add another more surface are to cause potentially more reflections I suppose.

 

Its a tough question - there is little data to go by, and I can't assume that my end result is the same as in the JERG guide, which, btw, only shows a slight smoothing out of frequency response in the 1 khz - 6 khz range mainly. I am not sure that there was a big impact on decay.

 

As far as I am concerned however, the basic mod - cutting some holes and cutting out excess pleather from the plastic ring is an improvement. I am willing to bet that the right pads would make a big difference in terms of improving damping. Stay next to the seam and try to get two rows or so, and you will probably get a maximum impact. I may take an exacto knife to mine again / remove spacers again with the same songs and have another listen.

 

I'd like to stuff a wad of poly-fill into the cups to see what happens. Has anyone tried that?


Edited by MrMateoHead - 12/18/13 at 12:54pm
post #15302 of 19810
Quote:
Originally Posted by money4me247 View Post

not to bring up a much-discussed topic, but I was wondering about the velour pads. I am finding them less comfortable than the pleathers. I think it's because of the clamping force... do the velours soften up slash get less stiff over time?
they get more comfortable when you wear them for awhile. Give it time, and they will feel better on your head/ears smily_headphones1.gif
post #15303 of 19810

you don't understand how amplifying a planar magnetic headphone works and are making yourself sound like an idiot. 

post #15304 of 19810

might i ask what your source is feeding the receiver and what type of input you're using

post #15305 of 19810

and could you please explain to me what you mean by sounds worse? your stereo receiver has inaudible distortion going by the specifications

post #15306 of 19810
Quote:
Originally Posted by DoctaCosmos View Post
 

you don't understand how amplifying a planar magnetic headphone works and are making yourself sound like an idiot. 

 

This is coming from the same guy who said a waterfall plot showed intermodulation distortion.  You don't have to be so confrontational!

post #15307 of 19810

I just had to blow some hairs off my HE-400's left driver, I had some rattling on it during low bass.  I didn't know it was susceptible to that kind of thing; the diaphragms aren't sticky like those infamous beyer ones.

post #15308 of 19810
Quote:
Originally Posted by TMRaven View Post
 

I just had to blow some hairs off my HE-400's left driver, I had some rattling on it during low bass.  I didn't know it was susceptible to that kind of thing; the diaphragms aren't sticky like those infamous beyer ones.

lol!!! sheddding season now that winter is almost over?

 

aamzing how sensitive & detailed the HE400s are hahah

post #15309 of 19810

http://youtu.be/j77VKw9Kx6U this is pretty good stuff.  raven 37 minutes in he shows distortion through waterfall plot.  yes he's showing a speaker but the concept is the same

post #15310 of 19810

He flat out says it's resonance.

post #15311 of 19810
Quote:
Originally Posted by DoctaCosmos View Post
 

http://youtu.be/j77VKw9Kx6U this is pretty good stuff.  raven 37 minutes in he shows distortion through waterfall plot.  yes he's showing a speaker but the concept is the same

...lool. i can think of hundreds of better ways to spend an hour than watching that vid. like listening to music & getting drunk =P 2min in I was already bored.

post #15312 of 19810

and what is resonance

Another type of temporal distortion is resonance. This one is critical. Let's call it time dilation because it stretches the signal out for a longer duration than in the recording, in other words, lengthening the decay, or ringing. Stored energy that is not dissipated as heat is reradiated as unwanted sound. Drivers with poor damping and cabinets that don't completely absorb or block the internal vibrations of the enclosure radiate delayed acoustic energy into the room. This is a major contributor to the perception of, “It doesn't sound live; it sounds like speakers.” It is measured by the cumulative spectral decay, CSD.

post #15313 of 19810

Yes, resonance.  A far cry from imd.

post #15314 of 19810

@Money to some it is interesting.

post #15315 of 19810
Quote:
Originally Posted by money4me247 View Post

lol!!! sheddding season now that winter is almost over?

aamzing how sensitive & detailed the HE400s are hahah
I'm listening to the Pink Floyd album dark side of the moon, and can't get enough of this album through the he-400's! I'm extremely impressed also with the micro details that my hd650's don't reveal. Totally impressive!
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