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= Hifiman HE500 & HE400 Jergpad Mod v2.5 = - Page 76

post #1126 of 1702
Quote:
Originally Posted by jerg View Post
 

 

 

Here's my post on another forum about this:

 

 

Basically just a felt disc, with very specific cutouts so that the open portions of the driver are still open, and the magnet/steel portions are covered (bonded by double-sided tape). The intention is to damp away backwaves from the face when wearing the headphones. Subjectively the upper midrange gets a lot "clearer" sounding with this.

I got the idea to do this when I just did the whole foam disc thing on the driver, initially to tame the treble slightly, but it only partially tamed it and ended up sounding tizzy. At the same time though I noticed a completely separate effect - that the midrange sounded clearer and more open - which did not make much sense as I was covering up the drivers with the fabric, but it came to light that it could be reverberation-related, so I arrived at this.

 

Interestingly, the wooliness of the bass sounds quite diminished by this too. Not completely gone, at least not when A/Bed against my HE400. But it is a noticible improvement compared to before. The specific segment I test this with is the beginning section of 'If I Were You' by K.D. Lang. In my other usual bassy test tracks that improvement does propagate too.

 

 

 

Frequency response doesn't seem to be changed. It has its effect on overall clarity, by getting rid of backwave reverberations introduced between the face and the driver grill surfaces. Definitely not a massive retuning ala the Jergpad mod, but it's a stronger improvement than the regrilling mod.

 

Thanks for the details.  Are you using a custom grill (like the one in the regrilling thread; the pencil holder, I believe), or the stock grill?  Also, can you be more specific about the material you used.  Thanks.

post #1127 of 1702
Thread Starter 
Quote:
Originally Posted by ThurstonX View Post
 

 

Thanks for the details.  Are you using a custom grill (like the one in the regrilling thread; the pencil holder, I believe), or the stock grill?  Also, can you be more specific about the material you used.  Thanks.

Custom. I wrote the regrilling mod for Hifiman headphones, of course I am using it lol.

 

post #1128 of 1702

Inner and outer damping holes, done,  Velour pad, prepped.  Looks like know I need to learn how to sew.  

post #1129 of 1702

I dunno, I used temporary (but strong enough) glue to put the velour overlay on. Seems to work well enough...

 

Also, random news: I think I accidentally threw away the original HE-500 grills. Oops.

 

Jerg, I think I have the same metal mesh material on hand as you. What did you use to cut it out? I had a small pair of clippers, and my results were a bit...rough around the edges (literally!).


Edited by hans030390 - 11/10/13 at 3:08am
post #1130 of 1702
Thread Starter 
Quote:
Originally Posted by hans030390 View Post
 

I dunno, I used temporary (but strong enough) glue to put the velour overlay on. Seems to work well enough...

 

Also, random news: I think I accidentally threw away the original HE-500 grills. Oops.

 

Jerg, I think I have the same metal mesh material on hand as you. What did you use to cut it out? I had a small pair of clippers, and my results were a bit...rough around the edges (literally!).

Get a good pair of wire-snips.

 

And I think sewing is the way to go in the long term here, mainly because it is so much easier to wash the pads.

post #1131 of 1702
Quote:
Originally Posted by jerg View Post
 

Custom. I wrote the regrilling mod for Hifiman headphones, of course I am using it lol.

 

 

LOL.  Just checkin', man ;)  I certainly appreciate what you wrote.

 

Can you comment on the material you taped to the interior frame.

post #1132 of 1702
Thread Starter 
Quote:
Originally Posted by ThurstonX View Post
 

 

LOL.  Just checkin', man ;)  I certainly appreciate what you wrote.

 

Can you comment on the material you taped to the interior frame.

You mean what you see in the above photo? That's part of stock HE500 driver assembly. Hifiman added a ring of felt around the drivers.

 

If you mean the material used here

 

http://www.head-fi.org/t/646812/hifiman-he500-he400-jergpad-mod-v2-5-new-measurements-posted-modulor-orders-updated/1110#post_9965026

 

That's described in detail in the subsequent post.


Edited by jerg - 11/10/13 at 9:24am
post #1133 of 1702
Quote:
Originally Posted by jerg View Post
 

You mean what you see in the above photo? That's part of stock HE500 driver assembly. Hifiman added a ring of felt around the drivers.

 

If you mean the material used here

 

http://www.head-fi.org/t/646812/hifiman-he500-he400-jergpad-mod-v2-5-new-measurements-posted-modulor-orders-updated/1110#post_9965026

 

That's described in detail in the subsequent post.

 

D'oh!  Just re-read your post: FELT.  I'm awake now.  Thanks for sharing.

post #1134 of 1702

And sewing is done.  Turned out pretty good, but I have no idea how Modulor can make so many of these.  It took me 2 and a half hours just to make this one pair.  Now I need to go out and buy photo splits and some foam, but there's football to watch... 

post #1135 of 1702
Quote:
Originally Posted by hans030390 View Post
 

I dunno, I used temporary (but strong enough) glue to put the velour overlay on. Seems to work well enough...

 

Also, random news: I think I accidentally threw away the original HE-500 grills. Oops.

 

Jerg, I think I have the same metal mesh material on hand as you. What did you use to cut it out? I had a small pair of clippers, and my results were a bit...rough around the edges (literally!).

 

I used tin snips (look like short scissors, with a plastic tab on the tip(s)).  I also found that filing down the edge to thin them a bit made it much easier to get the plastic ring back on.  I did:

  1. Cut
  2. File
  3. Paint
post #1136 of 1702
Quote:
Originally Posted by kard16 View Post
 

And sewing is done.  Turned out pretty good, but I have no idea how Modulor can make so many of these.  It took me 2 and a half hours just to make this one pair.  Now I need to go out and buy photo splits and some foam, but there's football to watch... 

 

Looking good!

post #1137 of 1702
Quote:
Originally Posted by jerg View Post
 

Basically just a felt disc, with very specific cutouts so that the open portions of the driver are still open, and the magnet/steel portions are covered (bonded by double-sided tape). The intention is to damp away backwaves from the face when wearing the headphones. Subjectively the upper midrange gets a lot "clearer" sounding with this.

 

Interesting..looks a bit like the LCD driver with the slots. What about if you stick some felt on your face and dampen the waves away there too?

post #1138 of 1702
Thread Starter 
Quote:
Originally Posted by mlxx View Post
 

 

Interesting..looks a bit like the LCD driver with the slots. What about if you stick some felt on your face and dampen the waves away there too?

You're welcome to try bro.

post #1139 of 1702

Looks for some felt. Hmm, maybe I should grow a beard.

 

Some mods specifically for the problems the HE400 has would be good.

Still enjoy your HE400 these days or is it all HE500 now?

post #1140 of 1702
Thread Starter 
Quote:
Originally Posted by mlxx View Post
 

Looks for some felt. Hmm, maybe I should grow a beard.

 

Some mods specifically for the problems the HE400 has would be good.

Still enjoy your HE400 these days or is it all HE500 now?

A lot of HE400's problems are too tough to be remedied without making something else worse. The Jergpad mod helps smooth out its upper midrange, but it still has an aggressive treble emphasis, and high midrange distortion. The treble emphasis could maybe be attenuated by some substantial fabric filters but those tend to introduce their own issues. The midrange distortion with HE400s is intrinsic to its drivers rather than enclosure-related, so that can't really be helped.

 

It's like trying to train a healthy person for the olympics, vs trying to train someone who has chronic knee problems. The latter might be doable with some very invasive procedures, but for modding novices like myself, the former is much easier and more satisfying to mod and improve.

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