w00t! Updated blu-tac mod:

Apparently, the big blob of blu-tac I placed behind the driver's magnet was absorbing all the bass. The deep bass is there, but barely heard.

So I stuck a 1 sen coin on top of the blu-tac to reduce the surface of blu-tac, and to add more weight/inertia to the base of the driver unit. Bass amount has been somewhat restored... not quite as much as un-modded 668B, but the kick drums & double bass's sound as tight as Demi Moore's forehead on botox overdose!! =D

Bro, it's a steel cable for goodness sake. STEEL yo!!! Don't worry. There's no friggin way to break it. In fact, you'd have to use a bit of strength to straighten it out a bit.
As usual, do it bit by bit... until you find the death clamp is comfortable. Mine has very light clamping force---literally just sitting next to my ears. I can wear it all day. But it's a bit too loose, if I move my head around, it falls off. =P

I use the soft tissue that comes in a box, not those in rolls used in toilets.
I use 2 ply of tissue for the front half and 3 ply for the back. Use as much as you want. It's no biggie.
Just fold it in half and roll it nice and tight. Then slide it under the earpads. It should look like this --> ( )
The ori modder mentioned that it improves the bass or something like that. For me, it's adds comfort---I have ears like Dumbo the flying elephant.

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Added on December 31, 2010, 3:55 amThat Orca thing is the fugliest piece of crap I've ever seen. By gawd is it an abomination. LOL!

Let it burn in a few hundred hours first. The bass will increase & decrease as it burns in (weird, I know), before it settles.

This post has been edited by iamyuanwu: Dec 31 2010, 07:05 PM

@iamyuanwu, maybe some snap shot of the modding could help ease Superlux fanatic user?

happy new year fellow superlux users! Enjoy your new year while listening to your fav cans!

Happy New Year to you and all Superlux fans

HD681 sounds nice on onboard souncard compared to HD668B.Although the bass is abit overwhelming at times but with a simple EQ change the problem goes away pretty easily

This post has been edited by Hitman66: Jan 1 2011, 03:54 PM

Happy new year superlux fans hehe going to join the club soon, 668b ordered.

me 2,,just order it from bro trio..

Yup i know that bro trio is working out to get faster stock for us, just have to be patient lo.

@iamyuanwu
Thanks for the clarification, will definitely try the mod soon. Thanks man!

second that
After tested both unit outl of box, I think I like 681 more than 668b due to 668b lack of bass. put back 668b on the box and leave it to eat dust on my closet. may open again if i have proper amp and dac to play with. waiting for 681 finish burning in. 1 week to go....

Burn in the 668B too. The bass will be different after a few hundred hours of burn in.

but i dun think he wants that coz bass will get lesser oomph after burn in.

i find myself stashing my 681 rather than the 668b.. 681 is too sibilant to my liking.. though the bass is good, much deeper than the 668 (thought now that much of margin) the highs are seriously killing my ears.. huhu..

yeah, im liking my 668B as well
can zzz while listening to songs now, where the music is nicely balanced and i feel comfortable listening to it
but still is burning it in for now

But I guess after burn in, the bass will be clearer and extension will be lower, even though its not as loud as before.
I want clarity rather than high volume in bass when listening to music. Unless people prefer strong bass in gaming or movie.
Monitor headphone should be as neutral as possible, adding unnecessary bass just spoil the music.

IU - Real.flac > Foobar2k w/asio > Sq210a+ > Pa2v2 > HD381F = TOO STRONG!

selling my 681.. not my taste... the 668b is a keeper though.. good synergy with ipod n my diy cmoy amp..

For those interested in how to open up the 668B...


Pop the cap open from the top (12 o'clock position) with the tip of a blade/knife. There's a tiny space beneath the cap at 12 o'clock position.

*Notice that the 2 earpieces are wide apart. I've applied some elbow grease to reduce the death clamp.
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To access beyond this part, you need to cut the [original] wires (and preferably mod it to dual entry). Modding it to dual entry will make future modifications easier.

I also added blu-tac into this space. Rockgrotto forummers replace the outer cover (the one on the bottom right) with an aluminium one to add weight. Well, I can't DIY my own aluminium cover, so I'll have to make do with Blu-Tac.
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The blu-tac is to increase the weight/inertia of the driver... supposedly to help reduce boom and tightens up everything. YMMV.
But the Blu-Tac will absorb A LOT of bass. So the 1 sen coin is added.
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Hate that faux-leather polyester crap earpads that make you sweaty?
Cut up a pair of sock and put it over the earpads. Use the tissue mod to keep the socks in place.
I've never felt sweaty or my ears feel stuffy after wearing for long hours.



This post has been edited by iamyuanwu: Jan 5 2011, 05:49 AM

@iamyuanwu
Wah impressive mods n pictures, my fingers itchy ord . Thanks so much!!!

wow thx iamyuanwu
good guide there!