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Author Topic: This is how to tighten your HD650 bass, Totaly reversible mod !!!  (Read 7416 times)

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Lumos

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This is how to tighten your HD650 bass, Totaly reversible mod !!!
« on: August 28, 2013, 01:10:43 AM »
Pirates  :)p7 :)p7

This is how to tighten your HD650 bass, and overall refine your headphone. (if I am not exaggerating here) Put acoustic foam back on the grill, see pics:
Results: Bass is more tight, tone of Violins, Bassoon, Tuba and Oboes is MUCH more neutral.
If you are not listening classical just try something and compare bass before and after (for example I love this tracks  :D)


Or find good recording of Vivaldi's Four season Summer Presto and you will catch how neutral is the presentation. Mod is totally reversible!!!

Pictures here: http://silivrus.tumblr.com/ sorry I can't attach them here  :-Z
« Last Edit: August 28, 2013, 01:29:49 AM by Lumos »
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donunus

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Re: This is how to tighten your HD650 bass, Totaly reversible mod !!!
« Reply #1 on: August 28, 2013, 02:22:04 AM »
Thats a new one. cool. I wished I had a 650 here with me right now to try. So I assume you just transferred the foam from the front to the back right? No more foam at the front of the drivers?
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Lumos

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Re: This is how to tighten your HD650 bass, Totaly reversible mod !!!
« Reply #2 on: August 28, 2013, 02:57:42 AM »
Quote from: donunus on August 28, 2013, 02:22:04 AM
Thats a new one. cool. I wished I had a 650 here with me right now to try. So I assume you just transferred the foam from the front to the back right? No more foam at the front of the drivers?

Yes transferred, I am gonna put some acoustic transparent material in front of drivers, just to protect from dirt and hair. When I uploaded pics it was like one hour I was testing, more and more I am spending time to listen I am totally blown, It is different headphone now, No longer slow bass, vocals are unimaginably natural, percussion instrument are so powerfully defined. more sparkle still without fatiguing.

I have 6 headphone right now, I have listened probably all popular models. (not orthoes) HD650 with this modd blows out of water many of them.

Please someone... try this and you will not regret  :)p13   
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Marvey

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Re: This is how to tighten your HD650 bass, Totaly reversible mod !!!
« Reply #3 on: August 28, 2013, 04:09:10 AM »
Foam or felt material in front of the driver will push down the treble measurably. I know Anax runs his HD800 without the cover in place (among the other mods) to get better clarity and resolution.


I wish I could try this out. Heh, so simple.




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donunus

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Re: This is how to tighten your HD650 bass, Totaly reversible mod !!!
« Reply #4 on: August 28, 2013, 10:54:11 AM »
I myself like the hd650 with the stock config but it doesn't hurt to try the foam at the back.
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Lumos

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Re: This is how to tighten your HD650 bass, Totaly reversible mod !!!
« Reply #5 on: August 28, 2013, 12:22:31 PM »
Quote from: purrin on August 28, 2013, 04:09:10 AM
Foam or felt material in front of the driver will push down the treble measurably. I know Anax runs his HD800 without the cover in place (among the other mods) to get better clarity and resolution.


I wish I could try this out. Heh, so simple.

Purrin, my theory is that foam on the back of the grill decreased air flow and created more pressure in the cup, that why diaphragm is now more ,,easy'' to control, and bass is more tight. also it absorbs unwanted treble and mid range reflected waves from the back and compensates openness on front, since HD650 has no nasty peaks on treble region I believe It is OK to open front side of the driver and dampen it from back. I would not do the same for HD800 because it has more tilted 6-10 kHz which could cause sibilance, glare or shrillness.

The results is stunning, lets take vocals, strings, bass, brass instruments, especially male and female voices exhibit great naturalness. I felt that original was little bit muddy, murky sounding, sometimes vocal was shy,  I have never heard any headphone sounded like this in my experience.

To compare: original HD650 was mediocre 2.1 speaker system bought for 150$ from next big electronics store now it is very good 2.0 studio monitors.

I wish I could send my pair for measurements but sadly I am not in USA now.   
« Last Edit: August 28, 2013, 12:51:10 PM by Lumos »
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Thujone

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Re: This is how to tighten your HD650 bass, Totaly reversible mod !!!
« Reply #6 on: August 28, 2013, 12:42:02 PM »
I may have to try this with my HD580's when I get home  :)p5
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donunus

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Re: This is how to tighten your HD650 bass, Totaly reversible mod !!!
« Reply #7 on: August 28, 2013, 03:26:50 PM »
Based on my hd600 experimentation, I did like the bounce and richness with the foams on the front more than the sound without the foams because i felt there to be some ringing without the foams on... but I never thought to put the foam at the back to see if it loses that ringyness.

Can you compare the sound without the foam at the back or the front (no foam at all) vs your mod and report what you notice? I would be interested to learn if the foam at the back does something significant even compared to the sound of the hd650 already defoamed on the front.
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Solderdude

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Re: This is how to tighten your HD650 bass, Totaly reversible mod !!!
« Reply #8 on: August 28, 2013, 03:43:02 PM »
I have used my HD650 for years that way and preferred it over the 'stock' version.
For me it did nothing to the bass, just added a little clarity.

The ringing donunus found was most likely not imagined by the way.  :)p1

It's the old version (black driver) and it increased the highs somewhat (added some needed clarity).
Over the driver I used nylon stocking.
Reversed the mod recently after I measured the HD650 and found a weird very narrow ringing I could not explain.
Turns out this disappeared when I put the foam back where it belonged.
Sennheiser may have put it there for more reasons than just a simple dust filter.

Stock black HD650


HD650 with foam on the rear grille instead of before the driver:


CSD in stock condition:


CSD with foam transferred to the rear (and nylon stocking in front of the driver which changes nothing when left out):

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Thujone

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Re: This is how to tighten your HD650 bass, Totaly reversible mod !!!
« Reply #9 on: August 28, 2013, 04:34:43 PM »
Thank you for the measurements! That's really interesting that the ringing is coming out of the 9k valley. I can't say that I've seen much ringing coming from a valley as opposed to a peak before...
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