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Author Topic: Jerg / Modulor Pads for HE500 - Measurement Results  (Read 22744 times)

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jerg

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Re: Jerg / Modulor Pads for HE500 - Measurement Results
« Reply #130 on: May 28, 2014, 09:09:19 PM »
Quote from: Okamoto on May 28, 2014, 05:46:19 PM
Quote from: Armaegis on May 24, 2014, 03:08:58 PM
A buzz at specific frequencies is probably a bit of dirt or hair caught in the driver somewhere...

I found two strands which seemed to belong to the dust filter cloth and took out both of them with an anti-magnetic tweezer. The problem is, when I pulled the second one, the diaphragm came together. Now the issue is gone, but I have a little hole on the diaphragm. Should have never opened it  :'(

Here's a photo of the hole:



Does anyone know if the hole can get larger with use?


Eek! You should just get that replaced by Head-direct/Hifiman at this point.
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Okamoto

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Re: Jerg / Modulor Pads for HE500 - Measurement Results
« Reply #131 on: May 29, 2014, 02:13:58 AM »
Quote from: jerg on May 28, 2014, 09:09:19 PM
Quote from: Okamoto on May 28, 2014, 05:46:19 PM
Quote from: Armaegis on May 24, 2014, 03:08:58 PM
A buzz at specific frequencies is probably a bit of dirt or hair caught in the driver somewhere...

I found two strands which seemed to belong to the dust filter cloth and took out both of them with an anti-magnetic tweezer. The problem is, when I pulled the second one, the diaphragm came together. Now the issue is gone, but I have a little hole on the diaphragm. Should have never opened it  :'(

Here's a photo of the hole:



Does anyone know if the hole can get larger with use?


Eek! You should just get that replaced by Head-direct/Hifiman at this point.

Not sure if they'd offer me a replacement. But yeah, It's the only thing left to do.

The cloth strand was really from the dust filter. Looks like it still had some glue on it, that's why it was stuck to the diaphragm. Not a clue how they got there since I've never removed my HE-500s grills until now.
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jerg

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Re: Jerg / Modulor Pads for HE500 - Measurement Results
« Reply #132 on: May 29, 2014, 02:19:47 AM »
Quote from: Okamoto on May 29, 2014, 02:13:58 AM
Quote from: jerg on May 28, 2014, 09:09:19 PM
Quote from: Okamoto on May 28, 2014, 05:46:19 PM
Quote from: Armaegis on May 24, 2014, 03:08:58 PM
A buzz at specific frequencies is probably a bit of dirt or hair caught in the driver somewhere...

I found two strands which seemed to belong to the dust filter cloth and took out both of them with an anti-magnetic tweezer. The problem is, when I pulled the second one, the diaphragm came together. Now the issue is gone, but I have a little hole on the diaphragm. Should have never opened it  :'(

Here's a photo of the hole:



Does anyone know if the hole can get larger with use?


Eek! You should just get that replaced by Head-direct/Hifiman at this point.

Not sure if they'd offer me a replacement. But yeah, It's the only thing left to do.

The cloth strand was really from the dust filter. Looks like it still had some glue on it, that's why it was stuck to the diaphragm. Not a clue how they got there since I've never removed my HE-500s grills until now.

They have to offer you a replacement. The driver has a significant buzzing issue, which is caused by a fibre glued to the diaphragm membrane. Either way (buzzing driver without hole, or non-buzzing driver with a hole) it is defective.
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Okamoto

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Re: Jerg / Modulor Pads for HE500 - Measurement Results
« Reply #133 on: May 30, 2014, 12:31:37 PM »
Just received an answer from hifiman. They're gonna replace it  :)p7
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aroldan

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Re: Jerg / Modulor Pads for HE500 - Measurement Results
« Reply #134 on: May 31, 2014, 05:47:04 AM »
Jerg, what do you think of using cork instead of felt for damping? I've heard that cork has good acoustical properties.
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jerg

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Re: Jerg / Modulor Pads for HE500 - Measurement Results
« Reply #135 on: May 31, 2014, 06:18:18 AM »
Quote from: aroldan on May 31, 2014, 05:47:04 AM
Jerg, what do you think of using cork instead of felt for damping? I've heard that cork has good acoustical properties.

You mean for the fuzzor mod? I think that on a very small scale such as with this mod, where the strips are cut to be only a few millimetres across in width, felt or very porous acoustic foam are the best bet. Cork-like material may be more effective on a macroscopic scale.

Also, an issue I encountered was that it was very easy for the fuzzor mod to negatively interfere with the initial sound waves passing through the slits between the magnets, which introduced issues in the upper mids / treble region. To strictly absorb the backwaves and do nothing more, felt strips with rounded-off edges was the compromise that made the most sense to me.
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Okamoto

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Re: Jerg / Modulor Pads for HE500 - Measurement Results
« Reply #136 on: August 13, 2014, 08:36:53 PM »
Guys, I just received my replacement from HiFiMAN. I started testing it with some music and everything seemed ok. Then I decided to do the sinegen test again, just to make sure the "bzz" arround 500hz has disappeared. For my surprise, it's still there. I'm starting to think this is inherent to the headphone. I did the tests with a Xonar DG because my main rig is at loan. Do you think this "bzz" I'm hearing is being caused by the source/amp? Or maybe it's some kind of artifact introduced by sinegen? I only hear this when I put the Level at 0dB.

EDIT. Guys, looks like this time it's really being caused either by amplification or sinegen itself, because it happens with all my headphones(except HD800, because the cable was loaned too lol) in all frequencies at 0.5~0.0dB. Sorry for posting before doing further experiments.
« Last Edit: August 13, 2014, 08:55:15 PM by Okamoto »
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Marvey

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Re: Jerg / Modulor Pads for HE500 - Measurement Results
« Reply #137 on: August 13, 2014, 09:29:55 PM »
Are you running just a plain sine at 500Hz? What volume approx? You don't happen to be feeding an O2 amp?

EDIT (based on your edit and better reading comprehension on my part):

Some equipment tends to clip at 0db. Seriously.
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Okamoto

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Re: Jerg / Modulor Pads for HE500 - Measurement Results
« Reply #138 on: August 13, 2014, 09:38:44 PM »
Quote from: purr1n on August 13, 2014, 09:29:55 PM
lip at 0db. Seriously.

Yeah, looks like it's either the Xonar DG or an artifact introduced by sinegen. Only way to really know if the issue is gone is when I have my rig back.

Oh, and by the way, on another topic, I just removed the HE-500 pads to check if they sent the jergpads back(I forgot to remove it when I sent my old HE-500 and asked them to ship it back with the replacement unit) and noticed something was different. I think they sent me one of the new pads developed for the HE-560 or HE-400i. Anyone who has these two can confirm it to me? Pic below(velours on top and the supposedly HE-560 pads below):



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jerg

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Re: Jerg / Modulor Pads for HE500 - Measurement Results
« Reply #139 on: August 13, 2014, 09:55:58 PM »
Quote from: Okamoto on August 13, 2014, 09:38:44 PM
Quote from: purr1n on August 13, 2014, 09:29:55 PM
lip at 0db. Seriously.

Yeah, looks like it's either the Xonar DG or an artifact introduced by sinegen. Only way to really know if the issue is gone is when I have my rig back.

Oh, and by the way, on another topic, I just removed the HE-500 pads to check if they sent the jergpads back(I forgot to remove it when I sent my old HE-500 and asked them to ship it back with the replacement unit) and noticed something was different. I think they sent me one of the new pads developed for the HE-560 or HE-400i. Anyone who has these two can confirm it to me? Pic below(velours on top and the supposedly HE-560 pads below):





No, looking at how far the bottom flaps go over the mounting ring, that's a regular old earpad.

But the bottom mounting ring is definitely what's used in the hybrid pads (with its extra-large openings).
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