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= Hifiman HE500 & HE400 Jergpad Mod v2.5 = - Page 33

post #481 of 1702
Perhaps. What software do you use for it? Can it just be derived from the impulse response (which I have) ?
post #482 of 1702
Thread Starter 
Quote:
Originally Posted by bcpk View Post

Perhaps. What software do you use for it? Can it just be derived from the impulse response (which I have) ?

No idea, you might wanna consult this thread about it:

 

http://www.head-fi.org/t/566929/headphone-csd-waterfall-plots

post #483 of 1702
Quote:
Originally Posted by d34dh0r53 View Post

PM me your info, so we can work something out.  I've already done it on mine and it's a world of difference and I'd love to help.

Thanks for the offer to help a not so handy fellow headfi'er..biggrin.gif

u got a pm..

thanks again mate!

post #484 of 1702
post #485 of 1702

Great writeup Jerg!  Im going to go for it in a few days.  Also, can anyone else comment if they have had experience with the he400 and the mad dog alpha pads?  Thanks!

post #486 of 1702
Quote:
Originally Posted by bcpk View Post

Doing some pad measurements today. Haven't processed the results yet. Did stock pleather, stock velour for 5 x 60 second Sine sweeps and will average them. Just got my J$ pads but didn't have any glue or material for the driver-covering nylon, so I still have to measure those. As well as Jergpad stages I, II, III and IV biggrin.gif

EpCJrj8l.jpg

 

Very cool picture.  I'm calling it "Mr. Van Gogh in his lab"

post #487 of 1702

Jerg,

 

Silly question for you. Could you cut a section of the hard foam ring that was removed in step #2 of Part 1 and use that in stead of the stacks of tape for Part 2 the back vent mod? The cut section would be retucked in the same location as the tape stacks. Would it not achieve the same results without venting? Might result in a cleaner look and help Part 4 more by completing the seal.
 


Edited by weverb - 3/13/13 at 6:33am
post #488 of 1702
Thread Starter 
Quote:
Originally Posted by weverb View Post

Jerg,

 

Silly question for you. Could you cut a section of the hard foam ring that was removed in step #2 of Part 1 and use that in stead of the stacks of tape for Part 2 the back vent mod? The cut section would be retucked in the same location as the tape stacks. Would it not achieve the same results without venting? Might result in a cleaner look and help Part 4 more by completing the seal.
 

Anything rubbery that keeps its thickness well under pressure over time would be ok. If you just cut out rectangles from the hard foam that'd be a bit too thick though, maybe half the thickness would be good.

post #489 of 1702
Quote:
Originally Posted by jerg View Post

Anything rubbery that keeps its thickness well under pressure over time would be ok. If you just cut out rectangles from the hard foam that'd be a bit too thick though, maybe half the thickness would be good.

 

Just to clarify, I meant to retuck it between the ring and pleather pad. Not the ring and drivers.

post #490 of 1702
Thread Starter 
Quote:
Originally Posted by weverb View Post

 

Just to clarify, I meant to retuck it between the ring and pleather pad. Not the ring and drivers.

Not a great idea IMO; I tried that a long time ago and all it did was compress the foam inside the earpad, rather than gently lifting the section of the earpad. Bad for comfort, and no benefit to the SQ.

post #491 of 1702
Any white pleather pads that are the same as stock pleather? Also, any baby blue velour that will work with step 3?
post #492 of 1702
Quote:
Originally Posted by BobJS View Post

 

Very cool picture.  I'm calling it "Mr. Van Gogh in his lab"

This pic reminds me of a scene in Face/Off.

post #493 of 1702
Quote:
Originally Posted by BobJS View Post

Very cool picture.  I'm calling it "Mr. Van Gogh in his lab"
LOL! Just remembered he was the dude who cut his ear off... biggrin.gif
post #494 of 1702

I got some CSDs of a single velour measurement and a single pleather measurement... note that I say single. I did 5 of each but didn't have the time at my MATLAB PC to go through and average the readings. There are likely issues with these single readings so don't take too much from them. In particular, feel free to discount the low frequencies because that could just have been a truck driving past. I didn't really match up the impulse timing either so the two aren't really calibrated against the other. Anyhow, pics.

 

bHoWli7l.png

HE-400 with velour pads.

 

u0vRk3Hl.png

HE-400 with pleather pads.

 

I'll make the data available when I'm done so other people can try messing around with them.


Edited by bcpk - 3/13/13 at 4:21pm
post #495 of 1702
Thread Starter 
Quote:
Originally Posted by bcpk View Post

I got some CSDs of a single velour measurement and a single pleather measurement... note that I say single. I did 5 of each but didn't have the time at my MATLAB PC to go through and average the readings. There are likely issues with these single readings so don't take too much from them. In particular, feel free to discount the low frequencies because that could just have been a truck driving past. I didn't really match up the impulse timing either so the two aren't really calibrated against the other. Anyhow, pics.

 

bHoWli7l.png

HE-400 with velour pads.

 

u0vRk3Hl.png

HE-400 with pleather pads.

 

I'll make the data available when I'm done so other people can try messing around with them.

Looks cool! Yea they need some work averaging and matching up. Still a few observations can be drawn (purely in terms of the relative differences between the measurements of the two pad types, rather than absolute values).

 

The dip around 2kHz with pleathers are reflected here, as are the more prominent upper midrange with pleathers, relative to velours.

 

Wondering if that huge ringing ridge around 700 Hz is responsible for any detrimental effects (e.g. midrange glare), if it's a HE400 driver "thing" or an earpad "thing".

 

By the way what compensation did you use? The significant upper midrange dip associated with HE400 is not reflected in these plots.


Edited by jerg - 3/13/13 at 4:36pm
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