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= Hifiman HE500 & HE400 Jergpad Mod v2.5 = - Page 81

post #1201 of 1702
Thread Starter 

Redoing the backwave diffuser mod atm, with the Creatology adhesive-backed stiff felt. Gonna be a lot more stringent with my measurements and cutting this time around and make this as neat of a modification as I can.

post #1202 of 1702
Quote:
Originally Posted by jerg View Post
 

Redoing the backwave diffuser mod atm, with the Creatology adhesive-backed stiff felt. Gonna be a lot more stringent with my measurements and cutting this time around and make this as neat of a modification as I can.

Is that similar to what Audeze is doing with that panel in the earcup? I have seen the design before, there is an open-source initiative with that type of panel, but I can't seem to find it :(

 

 

 

EDIT: I'm pretty sure too that the open-source software can even accommodate very small panels for headphones. I need to find it lol.


Edited by brunk - 11/17/13 at 2:57pm
post #1203 of 1702
Thread Starter 
Quote:
Originally Posted by brunk View Post
 

Is that similar to what Audeze is doing with that panel in the earcup? I have seen the design before, there is an open-source initiative with that type of panel, but I can't seem to find it :(

 

 

 

EDIT: I'm pretty sure too that the open-source software can even accommodate very small panels for headphones. I need to find it lol.

Uh no, Audeze baffles are analogous to Hifman baffles, just that one is more closed, the other more open.

 

Backwaves can reflect just as severely off those Audeze baffles too, and so the mod I'm talking about would work beautifully on Audeze headphones as well.

 

If you mean the "Fazor" waveguide thing that the LCDX/XC are using, those are doing things slightly differently, they don't really do too much toward diffusing backwaves, instead their function is more for directing the initial soundwaves from the diaphragm better.

 

If you are just dropping in now and don't have any idea what my backwave diffusion mod is, you might wanna skim through a couple of pages back where it was discussed and explained in depth (page 75 and onward, to be specific).


Edited by jerg - 11/17/13 at 3:03pm
post #1204 of 1702

Thanks Jerg, yeah I am not caught up with your recent experimentations.

 

EDIT: Ok, I get it now lol. Yeah that looks like it could be a brilliant thing. :popcorn:


Edited by brunk - 11/17/13 at 3:17pm
post #1205 of 1702

jerg, did you happen to try any of this with the HE-400? As I don't have access to a HE-500, I may not be understanding the mod completely, but do you think it's possible to add a "grid" of adhesive felt directly on top of the white driver cover underneath the pad with positive results? I will admit that I don't know the complete effect of the backwaves you speak of, but it sounds like this could possibly numb the tizzy treble.

post #1206 of 1702
Quote:
Originally Posted by jerg View Post
 

Redoing the backwave diffuser mod atm, with the Creatology adhesive-backed stiff felt. Gonna be a lot more stringent with my measurements and cutting this time around and make this as neat of a modification as I can.

 

If it's not too late, could you post a photo of what a completed mod looks like on one driver.  Thanks.

post #1207 of 1702
Thread Starter 
Quote:
Originally Posted by ThurstonX View Post
 

 

If it's not too late, could you post a photo of what a completed mod looks like on one driver.  Thanks.

Sure, yeah I took some photos for the process last hour or two (1 driver down, another to go).

 

If you look closely, you can find 24 discrete pieces of felt that I cut out per driver face.

 

post #1208 of 1702
Quote:
Originally Posted by jerg View Post
 

Sure, yeah I took some photos for the process last hour or two (1 driver down, another to go).

 

If you look closely, you can find 24 discrete pieces of felt that I cut out per driver face.

 

 

Appreciate it.  Looks great with the stiff felt; very neat.  Pretty much how I did the original, which I'll redo tomorrow.  The photo is a perfect guide.

post #1209 of 1702
Thread Starter 
Quote:
Originally Posted by Thujone View Post
 

jerg, did you happen to try any of this with the HE-400? As I don't have access to a HE-500, I may not be understanding the mod completely, but do you think it's possible to add a "grid" of adhesive felt directly on top of the white driver cover underneath the pad with positive results? I will admit that I don't know the complete effect of the backwaves you speak of, but it sounds like this could possibly numb the tizzy treble.

It comes down to whether or not HE400's treble peak is (partially) due to backwave reflection off the drivers or not. I know purrin did a similar mod on his Abyss (absorptive damping on the baffles as well, but not directly on the slits, rather around it) and he measurably smoothed out the massive treble peak of the Abyss that way. He's planning to do the same thing on the slit areas of his Abyss too.

 

With Hifiman drivers, there aren't any large flat areas for reflection to occur on the baffles unlike Audeze/Abyss, instead it is all strips of metal surfaces.

post #1210 of 1702
Thread Starter 

Just finished both drivers up and put the pads back on, man it sounds good! The result is a much cleaner and less fuzzy presentation. Listening to some binaural recordings, it seems that imaging improved substantially.

 

The best way I can describe the sound improvement is it sounds as though the membrane is much tighter now, transients attack faster. Though obviously that is not the actual physical change, it is what I'd say the sonic change is analogous to.


Edited by jerg - 11/17/13 at 5:17pm
post #1211 of 1702
Quote:
Originally Posted by jerg View Post
 

Sure, yeah I took some photos for the process last hour or two (1 driver down, another to go).

 

If you look closely, you can find 24 discrete pieces of felt that I cut out per driver face.

 

Looks really good.  How did you cut the felt strips, with scissors or with an x-acto knife?

post #1212 of 1702
Thread Starter 
Quote:
Originally Posted by kard16 View Post
 

Looks really good.  How did you cut the felt strips, with scissors or with an x-acto knife?

I simply marked down the precise cutting patterns with a ruler and fine-point pen, at the back of the adhesive-backed felt (it's a nonstick peelable paper material at the back), then very easily cut out those precise stripes/wedges etc with a pair of scissors. Very pain-free process.

post #1213 of 1702

Just wanted to clarify, jerg, that the material you got is an adhesive felt and not more of a foam material, correct? I know the Creatology adhesive foam has been fairly popular in mods (I have a lot of it), but your materials looks noticeably different. Your material looks like it would be better at damping higher frequencies than the foam I have.

 

Also, did you also apply the felt under the plastic ring you removed, or was that like that stock? I'd check myself if I was at home right now.

post #1214 of 1702
Quote:
Originally Posted by hans030390 View Post
 

Just wanted to clarify, jerg, that the material you got is an adhesive felt and not more of a foam material, correct? I know the Creatology adhesive foam has been fairly popular in mods (I have a lot of it), but your materials looks noticeably different. Your material looks like it would be better at damping higher frequencies than the foam I have.

 

Also, did you also apply the felt under the plastic ring you removed, or was that like that stock? I'd check myself if I was at home right now.

 

Yep, Creatology adhesive felt.  I got it for a buck a sheet at Michaels.  As noted, there's a thicker, stiffer version (same thickness as the normal felt I got at Walmart and used the first time I did the mod), and a thinner, more flexible version.

 

Don't want to speak for jerg, but he said he used 24 pieces, and I counted them in his pic.  The ring part appears to be what's already there.  But I could be wrong.

post #1215 of 1702
Thread Starter 

 

Lined the outer face of the drivers with felt (including the inner ring of exposed plastic right below the grills). Much less of an impact on sound relative to the addition of the felt patterns on the inner faces of the drivers; sure looks snazzy though.

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