I had the same problem! First with FiiO E10 Olympus. I tried everything what ppl wrote on forums - nothing helped. I found the solution by accident, when I was having problems with suddenly PC turning off.   I had OC i5-750@3.9GHz and it was stable. After few months it began to be unstable...

Markbass, amazing guitar bass sound is from 662F and I think very natural. Also listening to the metal is also amazing on this cans :)

I am buying elements tommorow, I need to know how to obtain 1.33uF? What does 1uF//330nF mean? I found only 1uF capasitors.   Could you look at my basket posted below and confirm if all elements are ok? http://i.imgur.com/d5o2D9P.png   It's interesting what you wrote. Most of my favorite...

You know what? I think the 662F are better in metal music. This tight bass adds more "power" into riffs and these sibilances aren't so nasty. I have -4 on E07K and they are ok while in the 681 I have -10 trebles and -4 bass and they are still very unfriendly to ears.   We will see how the...

CoiL, may I ask you some questions again? (Yes, again, you'll be having nightmares about me, haha)   Are your values shown below cutting bass too? I want only cut trebles.   r1 = r2 = 47 Ohm r3 = r4 = 51 Ohm (56 Ohm if guitars and cymbals feel too bright) C1 = C2 = C3 = C4 = 1.33uF (1uF //...

Thank you for the explenation.   I read it a lot of times. I have been asking again and again because I was not sure about it and want to make it clear. You know what? I asked Frans which mod would be the best to the 662F and he wrote me that MKIII 681F. So I post here again because I had...

So your values are close to MKIII 681F mod. Only C1-4 are different (are they?) Look - http://www.mediafire.com/view/?pdkiijey07v9ai4 (bottom of the 9th page). All Cs should be exactly 1.33uF? And what these (C) components do in filter? Sorry for all these questions, I have no idea in electronic...

Yes, I read it, but my question is about choosing between the MKI and MKII filter. And wondering about concerns of cutting -10dB trebles in MKIII filter (MKII cuts the same if I read the schematic correctly)

CoiL, help :D   It's me again. I got the 662F today and still don't know what mod should I do... MKI, MKII. I will have MKIII in the box to 681 red, but don't know what about 662F.   -10dB at trebles (MKIII) is a huge difference and I am afraid of making 681 something like 330 (I have it and...

Ok, I see.   I am wondering if I customize EQ in my FiiO E07K will the result similar to filter?   The E07K has +10/-10dB bass and trebles (in 2dB step). The MKIII filter cuts -5dB bass and -10dB trebles, so in FiiO it will be -10 treble and -4 bass. Or the filter is better option? I am 100%...

I am doing MKIII filter to my 681 red, but I can't find any PDF with schematic to 662. I have F version.

But there are 2 versions of 681Evo as far as I know. I have 681 EVO MKII with velour pads. Read this: http://www.mediafire.com/view/av6k1rhkv5lwol6/Superlux_HD681_EVO.pdf

Which filter do you have on your headphones? MKI or Medium MKII? I wrote to the modder to ask about this mod and he told, he did it to his own 681, but he didn't remember which one (told that the one that should cut treble as much as it is possible - to something like Sennheiser). BUT - he told...

Thx for edit tip with recabling. Can you explain me, please, what is "dual-entry" re-cabling? 1 cable to one can and 2 cable to 2 can without connector between cans?

Thx. I can't do it on my own. I have to find someone to do it.   Link to HD-662F filter mod doesn't work.